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Teac FD235HF

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Teac FD235HFTeac Floppy Drive FD-235HF - 1.44 MB Floppy disk drive - Floppy - Internal - Ivory - PC


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Comments to date: 2. Page 1 of 1. Average Rating:
andy84 2:15pm on Wednesday, October 27th, 2010 
Looking at the picture I got the impression that it was closer to white. Not close. BE WARNED!
grayson_marik 7:43pm on Sunday, July 4th, 2010 
Paul Sasser Needed this Item to continue using DOS programs like to keep old Knowledge to work on older machines.

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doc0

TEAC FD-235HF-C891 MICRO FLOPPY DISK DRIVE SPECIFICATION

Rev. A

31 sheets in Total
TABLE OF CONTENTS Title Page 1. OUTLINE..... 1 2. DISK..... 2 3. PHYSICAL SPECIFICATION.... 3 4. OPERATIONAL CHARACTERISTICS.... 5 4.1 2MB Mode Data Capacity.... 5 4.2 1MB Mode Data Capacity.... 6 4.3 Disk Rotation Mechanism.... 6 4.4 Index Detection.... 7 4.5 Track Construction.... 7 4.6 Magnetic Head.... 7 4.7 Track Seek Mechanism.... 8 4.8 Window Margin and Others... 8 5. ENVIRONMENTAL CONDITIONS.... 9 6. RELIABILITY..... 10 7. POWER INTERFACE.... 11 7.1 Required Power.... 11 7.2 Power Interface Connector and Cable... 12 8. SIGNAL INTERFACE.... 14 8.1 Signal Interface Connector and Cable... 14 8.2 Electrical Charactristics.... 16 8.2.1 FDD side receiver and driver... 16 8.2.2 Host side receiver and driver.... 16 8.3 Input/Output Signals.... 18 8.3.1 DRIVE SELECT input signal.... 18 8.3.2 MOTOR ON input signal.... 18 8.3.3 DIRECTION SELECT input signal... 18 8.3.4 STEP input signal.... 18 8.3.5 WRITE GATE input signal... 18 8.3.6 WRITE DATA input signal... 19 8.3.7 SIDE ONE SELECT input signal... 19 8.3.8 TRACK 00 output signal.... 19 8.3.9 INDEX output signal.... 19 8.3.10 READ DATA output signal... 19 8.3.11 WRITE PROTECT output signal... 20 8.3.12 DISK CHANGE output signal... 20 8.3.13 Input/Output signals for density mode setting (HD OUT).. 20 8.3.14 NO CONNECTION (NC).... 21 8.3.15 Treatment of not-used signals... 21 9. CONTROL SEQUENCE... 23 9.1 Power-on.... 23 9.2 Seek Operation.... 24 9.3 Read Write Operation.... 25 9.4 Current Consumption Profile... 26 10. FRAME GROUNDING.... 28 11. TURN ON CONDITION OF INDICATOR AND SPINDLE MOTOR... 28 11.1 Front Indicator.... 28
11.2 Spindle Motor.... 28

1. OUTLINE

This specification provides a description for the TEAC FD-235HF, dual density (2/1MB, 2-modes), 90mm (3.5-inch) micro floppy disk drive (hereinafter referred to as FDD). Table 1-1 shows the outline of the FDD, and Table 1-2 shows the signal interface pin-assignment. (Table 1-1) Specification outline Model name Front bezel Front shutter Eject button LED indicator Safety standard Operation modes 90mm (3.5-inch) disk used Unformatted data capacity Data transfer rate Disk rotational speed Track density Track to track time Required power Signal output driver Input signal pull-up Function setting at delivery FD-235HF-C891 Beige (PS) Beige (PS) Beige (PS) Green UL, CSA & TV 2MB mode Write and read High density (2HD) 2M bytes 500k bits/s 300rpm 5.3track/mm (135tpi) 3ms +5V single (4.5 ~ 5.5V) Open collector TTL 1k 30% 1MB mode Write and read Normal density (2DD) 1M bytes 250k bits/s 300rpm
1. Interface setting 1.1 Pin12: DRIVE SELECT 1 input 1.2 Pin34: DISK CHANGE output 2. Other function setting 2.1 Automatic density setting for 2DD (1MB) disk or 2HD (2MB) disk. 2.2 LED turn on condition: DRIVE SELECT 2.3 Motor rotating condition: MOTOR ON 2.4 Ready and seek-complete gate (full-mask) for INDEX and READ DATA output pulses. 2.5 Auto-chucking at disk installation 2.6 Auto-recalibration at power on 2.7 Frame is electrically shorted to DC 0V. 34 pin right-angled header connector Equipped Not equipped
Interface connector Power connector Other optional function
(Table 1-2) Signal interface pin-assignment Pin Nos. 33 Signals NC P. key NC 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V Pin Nos. 34 Signals NC NC NC INDEX NC DRIVE SELECT 1 NC MOTOR ON DIRECTION SELECT STEP WRITE DATA WRITE GATE TRACK 00 WRITE PROTECT READ DATA SIDE ONE SELECT DISK CHANGE Direc Output Input Input Input Input Input Input Output Output Output Input Output
The FDD is equipped with a discrimination switch for the high density (HD) hole of an installed disk cartridge. Refer to item 8.3.13 as to the detailed explanation for density mode setting.

2. DISK

(1) Work disk 90mm (3.5-inch) micro floppy disks which are mutually agreed between the customer and TEAC. For 2MB mode : High density disk (2HD) 1MB mode : Normal density disk (2DD) (2) Cleaning disk The FDD does not require any cleaning disk. However, the dry type disk is used if required.
3. PHYSICAL SPECIFICATION
(Table 3-1) Physical specification Width Height Depth Weight External view Cooling Mounting 101.6mm (4.00 in), Nom. 25.4mm (1.00 in), Nom. 145mm (5.71 in), Nom., excluding front bezel 410g (0.90lbs), Nom., 415g (0.91 lbs), Max. See Fig. 3-1. Natural air cooling Mountings for the following directions are acceptable. (a) Front loading, mounted vertically. (b) Front loading, mounted horizontally with spindle motor down. (c) The flatness in (a) and (b) shall be within 25 in the direction in which the front bezel side is raised (+) or lowered (-). However, the flatness from +25 to horizontal level is allowed when the disk is eject out of the tray. Note: As to the other mounting directions than the above will be considered separately. With installation holes on the frame of the FDD. Refer to Fig. 3-1. Sheet metal PPHOX or ABS (Complying with UL94-5V)

Installation Material of flame Material of front bezel
(Fig. 3-1) FDD external view
4. OPERATIONAL CHARACTERISTICS
4.1 2MB Mode Data Capacity
(Table 4.1-1) 2MB mode data capacity Recording method Data transfer rate Tracks/disk Innermost track bit density Innermost track flux density Unformatted FM 343.19 (8,717) 686.38 (17,434) 6.25 1,000 0.128 4.096 655.36 0.256 4.608 737.28 0.512 5.12 819.2 MFM 686.38 (17,434) 686.38 (17,434) 12.5 2,000 0.256 8.192 1,310.72 0.512 9.216 1,474.56 1.024 10.24 1,638.4
k bits/s bpmm (bpi) frpmm (frpi)

Formatted

Data capacity
k bytes/track k bytes/disk k bytes/sector 32 sectors/track k bytes/track k bytes/disk k bytes/sector 18 sectors/track k bytes/track k bytes/disk k bytes/sector 10 sectors/track k bytes/track k bytes/disk
4.2 1MB Mode Data Capacity
(Table 4.2-1) 1MB mode data capacity Recording method Data transfer rate Tracks/disk Innermost track bit density Innermost track flux density Unformatted FM 171.61 (4,359) 343.19 (8,717) 3.0.128 2.048 327.68 0.256 2.304 368.64 0.512 2.56 409.6 MFM 343.19 (8,717) 343.19 (8,717) 6.25 1,000 0.256 4.096 655.36 0.512 4.608 737.28 1.024 5.12 819.2
4.3 Disk Rotation Mechanism
(Table 4.3-1) Disk Rotation Mechanism Spindle motor Spindle speed Motor servo method Motor/spindle connection Disk speed Long term speed variation (LSV) Instantaneous speed variation (ISV) Start time Average latency DC brushless motor 300rpm Frequency servo by ceramic oscillator Motor shaft direct The same as the spindle speed. 1.5% or less 2% or less 480ms or less 100ms
k bytes/track k bytes/disk k bytes/sector 16 sectors/track k bytes/trac k bytes/disk k bytes/sector 9 sectors/track k bytes/track k bytes/disk k bytes/sector 5 sectors/track k bytes/track k bytes/disk

4.4 Index Detection

(Table 4.4-1) Index Detection Number of index Detection method Detection cycle Index burst detecttion timing error (with specified test disk) 1 per disk revolution Rotor detection of spindle motor by Hall element or FG output. 200ms 1.5% 400s or less

4.5 Track Construction

(Table 4.5-1) Track Construction Track density Number of cylinders Number of tracks Outermost track radius (track 00) Innermost track radius (track 79) Positioning accuracy 5.3 tracks/mm (135tpi) Track pitch 187.5m 80 cylinders 160 tracks/disk Side 0 39.500mm (1.5551 in) Side 1 38.000mm (1.4961 in) Side 0 24.6875mm (0.9719 in) Side 1 23.1875mm (0.9129 in) 15m or less, with specified test disk (Track 40, 23 2C, 45 ~ 55%RH, horizontal)

4.6 Magnetic Head

(Table 4.6-1) Magnetic Head Magnetic head Effective track width after trim erase Read/write gap azimuth error Read/write head with erase gap, 2 sets 0.115 0.008mm (0.0045 0.0003 in) 0 18, with specified test disk

4.7 Track Seek Mechanism

(Table 4.7-1) Track Seek Mechanism Head position mechanism Stepping motor Stepping motor drive Track 00 detection method Track to track time Settling time Average track seek time Stepping motor and lead screw 4-phase, 20 steps per revolution 2 steps per track Photo-interrupter 3ms (excludes settling time, refer to item 8.3.4) 15ms or less (excludes track to track time) 94ms (includes settling time)
4.8 Window Margin and Others
(Table 4.8-1) Window Margin and Others Window Margin (with specified test disk, MFM method , PLL separator) 2MB mode 300ns or more 1MB mode 600ns or more Recommendable write pre-compensation 2MB mode 125ns 1MB mode 0 ~ 125ns Head load mechanism File protect mechanism Disk detection mechanism Disk inserting force Disk ejecting force Acoustic noise at 50cm Disk type descriminating mechanism Auto-recalibration Not equipped (The FDD becomes head load condition whenever a disk is installed.) Detection of write inhibit hole by switch Detection of disk installation by switch 6.86N (700g) or less at the center of disk 13.73N (1400g) or less 50dBA or less at 3ms or 4ms seek operation Detection of HD hole by switch Automatic recalibration to track 00 is executed immediately after power-on.
5. ENVIRONMENTAL CONDITIONS
(Table 5-1) Environmental Condition Operating 4 ~ 51.7C (39 ~ 125F) 20C (36F) or less per hour 20 ~ 80% (no condensation) Max. wet bulb temperature shall be 29.4C (85F) 14.7m/s2 (1.5G) or less (10 ~ 100Hz, 1 octave/ min sweep rate) Vibration 9.8m/s2 (1.0G) or less (100 ~ 200Hz, 1 octave/ min sweep rate) 4.9m/s2 (0.5G) or less (200 ~ 600Hz, 1 octave/ min sweep rate) Write & read: 49m/s2 (5G)(11ms, 1/2 sine wave) or less Shock Read only: 98m/s2 (10G)(11ms, 1/2 sine wave) or less 300m (980feet) ~ 5,000m (16,400feet) Altitude 686m/s2 (70G) (11ms, 1/2 sine wave) or less Storage 22~60C (8 ~ 140F) 30C (54F) or less per hour 5 ~ 90% (no condensation) Max. wet bulb temperature shall be 40C (104F) Transportation 40 ~ 65C (40 ~ 149F) 30C (54F) or less per hour 5 ~ 95% (no condensation) Max. wet bulb temperature shall be 45C (113F) 19.6m/s2 (2G) or less (10 ~ 100Hz, 1/4 octave/ min sweep rate)

Ambient temperature Temperature gradient Relative humidity
Notes: The above requirements are applied for the FDD without shipping box. When a long period is required for transportation such as by ship, storage environmental conditions should be applied.

6. RELIABILITY

(Table 6-1) Reliability MTTF MTTR Design component life Disk life Disk insertion Seek operation Preventive maintenance Soft error 30,000 power on hours or more (for typical operation duty) When failure, the FDD should be replaced in unit of the drive and not repaired in unit of parts or assemplies. 5 years passes/track or more 1.times or more 1 107random seeks or more Not required (for typical operation duty) 1 or less per 109 bits read A soft (recoverable) error means that it can be recoverred correcty within three retries. 1 or less per 1012 bits read A hard (unrecoverable) error means that it cannot be recovered correstly within three retries. However, it is recommended to be followed by a recalibration to track 00 and four additional retries. 1 or less per 106 seeks A seek error means that it can seek to a target track within one retry including a recalibration to track 00. Approved by UL, CSA and TV 15kV (150pF, 330) No hard error and/or no component damage occur when the test is applied to the operator access area (front bezel area).
Hard error Error rate Seek error
Safety standard Electro-static dischange test

7. POWER INTERFACE

7.1 Required Power The following specifications are applied at interface connector of the FDD. (1) DC +12V : Not required (2) DC +5V (a) Voltage tolerance :10% (4.5 ~ 5.5V) (b) Allowable ripple voltage :100mVp-p or less (including spike noise) (c) Current and power consumption
(Table 7.1-1) Current and power consumption Operating mode Stand-by Read operation Write operation Seek operation Seek operation peak Spindle motor start 3ms 6ms Average current Typ. Max. 8mA 10mA 0.30A 0.40A 0.30A 0.40A 0.56A 0.66A 0.60A 0.70A 0.9A 1.0A 0.62A 0.70A Average power Typ. Max. 40mW 55mW 1.50W 2.20W 1.50W 2.20W 2.80W 3.63W 3.30W 4.18W 4.50W 5.50W 3.10W 3.85W
Notes: 1. Values of Typ. current and power are specified at 5.0V, while the values of Max. are at 5.5V (+10%) with a disk of large running torque. 2. Stand-by mode is defined at the stop condition of spindle motor and seek operation. 3. Seek operation peak means the operation during the settling (15ms) after the seek conpletion. 4. Rush current flows within 150ms after the motor start. 5. Short time peak current except for power-on surge is less than 1.0A. 6. Refer to item 9.4 as to the current consumption profile.

7.2 Power Interface Connector and Cable (1) Power interface connector
(Table 7.2-1) Power interface connector FDD side connector Pin numbers Protection method for misconnection Connector external view Connector location Power interface connections Cable side matched connector Cable side matched pin TEKCON, P/N 1603-823-04R-54 or equivalent 4 pins Mechanical protection by the shape of connector housing See Fig. 7.2-1. See Fig. 3-1. See Table 7.2-2. AMP P/N 171822-4 (natural color) or equivalent AMP P/N 170204-2 (AWG#20 ~ 26, loose piece) or P/N 170262-2 (AWG#20 ~ 26, strip form) or equivalent
(2) Power interface cable: Any appropriate cables taking the maximum power consumption of the FDD will be acceptable. (Table 7.2-2) Power interface pin-assignment Power voltage DC +5V 0V (0V) (No conection) Pin numbers 3 4
Power interface connector Upper side of the FDD Pin number PCB Rear view

FDD side

Cable side

Cable Top view

(Fig. 7.2-1) Power interface connector external view

8. SIGNAL INTERFACE

8.1 Signal Interface Connector and Cable (1) Signal interface connector
(Table 8.1-1) Signal interface Connector FDD side connector Pin numbers and pin pitch Connector external view Connector location Cable side matched connector TEKCON, P/N 1136-0202-34R-3F-00 or equivalent 2.54mm (0.1 in) pitch, 34-pin block header (17-pin double rows, even number pins are upper side of the FDD). See Fig. 8.1-1. See Fig. 3-1 FUJITSU, P/N FCN-747B034-AU/B (closed end) or -AU/O (daisy chain) or equivalent.
Note: It is recommanded to use a polarizing type connector with a projection on the center of the housing to avoid mis-connection. Refer to Fig. 8.1-1. For such a polarizing connector, mark of the connector housing may show pin No.34. (2) Signal interface cable Maximum cable length : 2m (6.6 feet), by terminator of 1k or less (For daisy chain connection, the total cable length should be less than 2m). The longer the cable, the smaller the resistor value should be.
Upper side of the FDD 3P delete Rear view
Signal interface connector Pin numbers

Lower side of the FDD

FDD side signal interface connector Projection (upper side) Cable side signal interface connector

Top view

Side view
(Fig. 8.1-1) Signal interface connector external view
8.2 Electrical Charactristics Vcc means +5V power voltage supplied to the FDD. 8.2.1 FDD side receiver and driver The specification are applicable at the interface connector of the FDD.
(Table 8.2-1) FDD side receiver and driver Interface driver/reciver LOW level (TRUE) Input signals LOW level input current (TTL level) Electrical characteristics of HIGH level (FALSE) receiver Terminator resistor value See Fig. 8.2-1. 0 ~ 0.7V 5.9mA, Max. (Including terminator current) 2.2V ~ +5V power voltage 1k 30% Terminator (pull-up) resistor is connected to each input. 0 ~ 0.4V 37mA, Max. Depending on host side terminator

LOW level (TRUE) Electrical Output signals characteristics of (Open collector driver driver) Driver sink current capability HIGH level (FALSE) 8.2.2 Host side receiver and driver
(Table 8.2-2) Host side receiver and driver Host side driver Driver required sink current Host side receiver Host side terminator resistor value TTL, CMOS, etc. FDD input current Number of daisy chained FDD TTL, CMOS, etc. Terminator is required for each output signal line from the FDD. Usually 1k ~ 2.2k is used. (150 Min.)
FDD PCB Assy Control & R/W LSI (Bi-CMOS)
DRIVE SELECT Terminators Other input signals Other output signals 5V

Select

Open collector drivers
(Fig. 8.2-1) FDD signal interface circuit
8.3 Input/Output Signals In the following, input signals are those transmitted to the FDD while output signals are those transmitted from the FDD. LOW level of the signals is TRUE unless otherwise specified. Refer to Table 1-2 as to the signal needed in this specification. 8.3.1 DRIVE SELECT input signal (1) Signal to select a specific FDD for operation in multiplex control. (2) All the input/output signals except for the MOTOR ON and MODE SELECT are valid after this signal is made TRUE. The time required to be valid is 0.5sec, Max. including transmission delay time of the DRIVE SELECT signal through the interface cable. (3) Refer to item 11.1 as to the turn-on condition of the front bezel indicator.
8.3.2 MOTOR ON input signal (1) Level signal to rotate the spindle motor. (2) The spindle motor reaches to the rated rotational speed (300rpm) within 480ms after this signal is made TRUE. (3) Refer to item 11.2 as to the rotational condition of the spindle motor. 8.3.3 DIRECTION SELECT input signal (1) Level signal to define the moving direction of the head when the STEP line is pulsed. (2) Step-out (moving away from the center of the disk) is defined as HIGH level of this signal. Conversely, step-in (moving toward the center of the disk) is defined as LOW level of this signal. (3) The signal shall maintain its level for 0.8s, Min. prior to the trailing edge of the STEP pulse. Refer to Fig. 9.2-1. 8.3.4 STEP input signal (1) Negative pulse signal to move the head. The pulse width shall be 0.8s or more and the head moves one track space per one pulse. (2) The access motion (head seek operation) is initiated at the trailing edge of the STEP pulse and completes within 18ms after starting the access including the settling time. (3) For the subsequent motion in the same direction, the STEP pulses should be input with the interval of 3ms or more, while the pulses should be input with the interval of 4ms or more for a direction change. Refer to Fig. 9.2-1. STEP pulses less than 3ms interval for the same direction or less than 4ms interval for a direction change may cause seek error. (4) STEP pulses are ignored and the access motion is not initiated when one of the following conditions is satisfied. (a) The WRITE PROTECT signal is FALSE and the WRITE GATE signal is TRUE. (b) The TRACK 00 signal is TRUE and the DIRECTION SELECT signal is HIGH level (step-out). (c) Step-in operation (DIRECTION SELECT signal is LOW level) from track 81. 8.3.5 WRITE GATE input signal (1) Level signal to erase the written data and to enable the writing of new data. (2) The FDD is set to write mode when the following logical expression is satisfied. WRITE GATE * DRIVE SELECT * WRITE PROTECT (3) This signal shall be made TRUE after satisfying all of the following conditions. (a) 18ms has been passed after the effective receival of the final STEP pulse.

(b) 100s has been passed after the level change of the SIDE ONE SELECT signal. (4) The following operations should not be done at least 650s after this signal is changed to FALSE. (a) Make the MOTOR ON signal FALSE. (b) Start the head seek operation by the STEP pulse. (c) Make the DRIVE SELECT signal FALSE. (d) Change the level of the SIDE ONE SELECT signal. 8.3.6 WRITE DATA input signal (1) Negative pulse signal to designate the contents of data to be written on a disk. The pulse width should be 0.1s through 1.1s and the leading edge of the pulse is used. (2) WRITE DATA pulses are ignored while either of the following conditions is satisfied. (a) The WRITE GATE signal is FALSE. (b) The WRITE PROTECT signal is TRUE. (3) This signal should be input according to the timing in Fig. 8.3-2. It is recommended to stop the input of the WRITE DATA pulses during the read operation in order to avoid harmful cross talk. 8.3.7 SIDE ONE SELECT input signal (1) Level signal to designate which side of a double sided disk is used for reading or writing. (2) When this signal is HIGH level, the magnetic head on the side 0 surface (lower side) of the disk is selected, while the magnetic head on the side 1 surface (upper side) is selected when this signal is LOW level. (3) The READ DATA pulse on a selected surface is valid more than 100s after the change of this signal level. (4) Write operation (the WRITE GATE signal is TRUE) on a selected surface shall be started more than 100s after the change of this signal level. 8.3.8 TRACK 00 output signal (1) Level signal to indicate that the head is on track 00. (2) This signal is valid more than 2.8ms, after the effective receival of the STEP pulse. 8.3.9 INDEX output signal (1) Negative pulse signal to indicate the start point of a track and one index pulse per one disk revolution is output. (2) INDEX pulse is output when the following logical expression is satisfied. Index detection * DRIVE SELECT * Ready state * Seek-complete Notes: (a) Ready state: The FDD is powered on. A disk is installed. Auto-chucking completed. A motor-on command is TRUE and 505ms, approx. has been passed. An INDEX pulse has been detected after motor-on command. (b) Seek-complete means the state that 15.8 ~ 17.9ms has been passed after the trailing edge of the final STEP pulse. (3) Fig. 8.3-1 shows the timing of this signal. Leading edge of the pulse shall be used as the reference and pulse width is 1.5ms through 5ms. 8.3.10 READ DATA output signal (1) Negative pulse signal for the read data from a disk composing clock bits and data bits together.
(2) Fig. 8.3-3 shows the timing of this signal. Pulse width is 0.15s through 0.8s and the leading edge of the pulse shall be used as the reference. (3) READ DATA pulse is output when the following logical expression is satisfied. Read data detection * DRIVE SELECT * Write operation * Ready state * Seek-complete Notes: (a) Refer to item 8.3.9 as to the ready state. (b) Write operation is the state while the WRITE GATE input signal is FALSE and erase delay time has been passed after the WRITE GATE signal changed to FALSE. (c) Refer to item 8.3.9 as to the seek-complete. (4) Output pulse is valid while all of the following conditions are satisfied. (a) 18ms has been passed after the effective receival of the final STEP pulse. (b) 100s has been passed after the level change of the SIDE ONE SELECT signal. (c) 650s (2MB mode) or 690s (1MB mode) has been passed after the WRITE GATE signal is changed to FALSE. 8.3.11 WRITE PROTECT output signal (1) Level signal to indicate that the write inhibit hole of an installed disk is open. (2) When this signal is TRUE, data on the disk are protected from miserasing and write operation is inhibited. 8.3.12 DISK CHANGE output signal (1) Level signal to indicate that a disk in the FDD is ejected. (2) This signal changes to TRUE when either of the following conditions is satisfied. (a) Power on. (b) A disk is removed. (3) The signal returns to FALSE when both of the following conditions are satisfied. Refer to Fig.8.3-4. (a) A disk has been installed. (b) A STEP command is received when the DRIVE SELECT signal is TRUE. 8.3.13 Input/Output signals for density mode setting (HD OUT) Every FDD model, there are any basic methods for setting the density mode of the FDD as shown in the following. Use the applicable method for the FDD in contents shown below. (1) Method A without using any interface signal (OPEN) (a) Interface signal is not used between the FDD and host-controller. Density mode of the FDD and host system are determined independently. (b) Density mode of the FDD is automatically set by discriminating the HD hole of an installed disk. If the density mode of the FDD is not coincident with that of the host controller, data errors always occur at read operation. (2) Methord B using HD OUT output signal (a) Density mode of the FDD is automatically set by discriminating the HD hole of an installed disk. (b) HIGH or LOW level of the HD OUT signal from the FDD is used to inform host controller whitch type of disk is installed in the FDD. And the density mode of the host is automatically determined according to this signal. (c) Table 8.3.13-1 shows the meaning of the logic level.

(Table 8.3.13-1) Meaning of the logic level Signal name HD OUT Logic level LOW LEVEL at HIGH DENSITY HIGH 2DD disk LOW 2HD disk
8.3.14 NO CONNECTION (NC) The NC pins are electrically isolated from any other circuit in the FDD. 8.3.15 Treatment of not-used signals If some of the provided input/output signals are not necessary for your application, keep the unused signal lines open or pull up by an appropriate resistor value (refer to item 8.2.2) at the host side. 1.5 ~ 5ms INDEX 197 ~ 203ms (300rpm)
(Fig. 8.3-1) INDEX timing WRITE GATE 1 WRITE DATA Magnetization on disk 0.1 ~ 1.1s 8s * : 0.5% Max. 2F t1 * rpm 4/3F t2 * 4/3F t2 * 1F t3 * t2 3s, Nom. 6s, Nom. 8s Max. t3 4s, Nom. 8s, Nom. 0 1
Density mode 2MB mode 1MB mode

t1 2s, Nom. 4s, Nom.

(Fig. 8.3-2) WRITE DATA timing (MFM method)
Magnetization on disk 1 READ DATA 0.15 ~ 0.8s 2F t4 4/3F t5 4/3F t5 1F t1

rpm 300 300

t4 2s, Nom. 4s, Nom.

t5 3s, Nom. 6s, Nom.

t6 4s, Nom. 8s, Nom.

t7 350ns 700ns

(Fig. 8.3-3) READ DATA timing (MFM method)
Power on Installed Disk installation STEP DISK CHANGE

Disk eject

Disk install Installed Ejected

1s, Max. 1s, Max.

Note: To simplify the timing chart, the DRIVE SELECT signal is assumed always TRUE in the above figure. (Fig. 8.3-4) DISK CHANGE signal timing

9. CONTROL SEQUENCE

9.1 Power-on (1) Protection against power on and off (a) In the transient period when the +5V power is lower than 3.5V, the FDD is protected against miswriting and miserasing whatever the state of input signals are. (b) Except for the condition of item (a), the FDD is protected against miswriting and miserasing as long as the WRITE GATE input signal does not change to TRUE. (2) Power reset time in FDD. Less than 400ms, including auto-recalibration
+5V power Valid interface signals

3.5 ~ 4.4V

Valid Power resetting 400ms, Max. with auto-recalibration
Internal miswrite protection
(Fig. 9.1-1) Power on sequence
9.2 Seek Operation Seek operation can be done independently of the spindle motor rotation.

t1 t1 t1 t1

DRIVE SELECT Step-out DIRECTION SELECT STEP t1 650s Min. WRITE GATE TRACK 00 2.8ms, Max. t1 0.8s t2 2s t2 3ms Min. t1

Step-in

t1 t1 4ms, Min. 3ms Min.

1s, Max.

(Fig. 9.2-1) Seek operation timing

9.3 Read Write Operation

(650s, Min.) MOTOR ON (650s, Min.) DRIVE SELECT 500ms, Max. READY Valid INDEX 15.8~17.9ms (Seek-complete) STEP 3ms, Min. WRITE GATE 8s, Max. WRITE DATA 18ms, Min. 0, Min. 0, Min. 100s, Min. SIDE ONE SELECT 100s, Max. READ DATA Valid Valid Valid Valid 15.8~17.9ms (Seek-complete) Other input signals Other output signals 0.5s, Max. Valid Valid 100s, Max. (650s,Min.) 650s, Max. (2MB mode) 690s, Max. (1MB mode) 8s, Max. 650s, Min. 0.3ms, Max.
(Fig. 9.3-1) Read/Write operation timing
9.4 Current Consumption Profile
+5V typical average current High current (350ms, Max.)
mA 0 Initial reset Auto-recalibration FDD status Stand -by Stand -by

15ms from the last step

Read Seek Read Write Read

Stand-by Drive selected

Power on Motor-on command DRIVE SELECT STEP Spindle motor power Steppin motor power Read write amp. power Logic power

Disk installation

Motor start Auto-chucking

Start rush on off on off

(Fig. 9.4-1) Typical average current profile
(1) Stand-by mode When both of the following conditions are satisfied, FDD goes to the stand-by mode (low power consumption mode). (a) The spindle motor stops. (b) Not in the seek operation (including the settling time). Note: In the stand-by mode, the FDD can immediately respond to a command from host controller with no restriction. If the polling operation of the DRIVE SELECT line is done in the stand-by mode, current flows intermittently and +5V current slightly increases. (2) Simultaneous operation of motor start and seek If a seek operation is done during the start-up of the spindle motor, or if the motor starts during the seek operation, +5V current at motor start increases by 0.55A, Max. from the value in Table 7.1-1. Stepping motor is energized at high power from the first STEP to 15msec after the last STEP. (3) +5V current increases for 15ms after a lapse of 500ms by engergizing of the motor.

10. FRAME GROUNDING

The FDD frame is electrically connected to DC 0V by the mounting screw of the main PCBA. (See Fig. 10-1). FDD Main PCBA

Interface connector (0V)

PCBA mounting screw

Frame ground tapped hole (M2.6)
(Fig. 10-1) Frame ground tapped hole
11. TURN ON CONDITION OF INDICATOR AND SPINDLE MOTOR
11.1 Front Indicator The indicator (LED) turns on while the DRIVE SELECT signal is TRUE. However, the indicator keeps off until 3.1ms has passed after the DRIVE SELECTion to avoid the polling operation of the DRIVE SELECT signal. 11.2 Spindle Motor (1) The spindle motor rotates while the MOTOR ON signal is TRUE. While no disk is installed, the spindle motor does not rotate at any condition. (2) Auto-chucking operation is executed at each disk installation by rotating the spindle motor for 490ms, approx. (500ms, Max.). All the interface signals are valid according to the explanation in item 8.3 while the auto-chucking operation is in progress.

doc1

TEAC FD-235HF-C929/C940/C991 MICRO FLOPPY DISK DRIVE SPECIFICATION

Rev. A

35 sheets in Total
TABLE OF CONTENTS Title Page 1. OUTLINE..... 1 2. DISK..... 2 3. PHYSICAL SPECIFICATION.... 3 4. OPERATIONAL CHARACTERISTICS.... 5 4.1 2MB Mode Data Capacity.... 5 4.2 1MB Mode Data Capacity.... 6 4.3 Disk Rotation Mechanism.... 6 4.4 Index Detection.... 7 4.5 Track Construction.... 7 4.6 Magnetic Head.... 7 4.7 Track Seek Mechanism.... 8 4.8 Window Margin and Others... 8 5. ENVIRONMENTAL CONDITIONS.... 9 6. RELIABILITY..... 10 7. POWER INTERFACE.... 11 7.1 Required Power.... 11 7.2 Power Interface Connector and Cable... 12 8. SIGNAL INTERFACE.... 14 8.1 Signal Interface Connector and Cable... 14 8.2 Electrical Charactristics.... 16 8.2.1 FDD side receiver and driver... 16 8.2.2 Host side receiver and driver.... 16 8.3 Input/Output Signals.... 18 8.3.1 DRIVE SELECT input signal.... 18 8.3.2 MOTOR ON input signal.... 18 8.3.3 DIRECTION SELECT input signal... 18 8.3.4 STEP input signal.... 18 8.3.5 WRITE GATE input signal... 18 8.3.6 WRITE DATA input signal... 19 8.3.7 SIDE ONE SELECT input signal... 19 8.3.8 TRACK 00 output signal.... 19 8.3.9 INDEX output signal.... 19 8.3.10 READ DATA output signal... 20 8.3.11 WRITE PROTECT output signal... 20 8.3.12 DISK CHANGE output signal... 20 8.3.13 READY output signal... 20 8.3.14 Input/Output signals for density mode setting (HD IN/HD OUT).. 20 8.3.15 NO CONNECTION (NC).... 21 8.3.16 Treatment of not-used signals... 22 9. CONTROL SEQUENCE... 24 9.1 Power-on.... 24 9.2 Seek Operation.... 25 9.3 Read Write Operation.... 26 9.4 Current Consumption Profile... 27 10. FRAME GROUNDING.... 29 11. CUSTOMER SELECTABLE STRAPS... 30
11.1 Function Summary of Straps... 11.2 DS0/DS1 Straps..... 11.3 HA/HI2/HO2 Straps... 11.4 RY34/DC34 Straps.... 11.5 FG Strap..... 12. TURN ON CONDITION OF INDICATOR AND SPINDLE MOTOR... 12.1 Front Bezel Indicator.... 12.2 Spindle Motor....

1. OUTLINE

This specification provides a description for the TEAC FD-235HF, dual density (2/1MB, 2-modes), 90mm (3.5-inch) micro floppy disk drive (hereinafter referred to as FDD). Table 1-1 shows the outline of the FDD, and Table 1-2 shows the signal interface pin-assignment. (Table 1-1) Specification outline Model name Front bezel Eject button LED indicator Safety standard Operation modes 90mm (3.5-inch) disk used Unformatted data capacity Data transfer rate Disk rotational speed Track density Track to track time Required power Signal output driver Input signal pull-up Customer selectable strap Function setting at delivery FD-235HF-C929 Black Black Green UL, CSA & TV 2MB mode Write and read High density (2HD) FD-235HF-C940 Beige (AT) Beige (AT) FD-235HF-C991 Beige (PS) Beige (PS)
1MB mode Write and read Normal density (2DD)
2M bytes 1M bytes 500k bits/s 250k bits/s 300rpm 300rpm 5.3track/mm (135tpi) 3ms +5V single (4.5 ~ 5.5V) Open collector TTL 1k 5%, unremovable 8 selections (DS0, DS1, RY34, DC34, HO2, HI2, HA, FG) Refer to item 11.1 1. Strap setting 1.1 DS1 : DRIVE SELECT 1 on pin 12 1.2 DC34 : DISK CHANGE on pin 34 1.3 HA : Automatic density setting for 2DD (1MB) disk or 2HD (2MB) disk. 1.4 FG : Frame is electrically shorted to DC 0V. 2. Other interface setting 2.1 Pin2 : Open 3. Other function setting 3.1 LED turn on condition: DRIVE SELECT 3.2 Motor rotating condition: MOTOR ON 3.3 Ready and seek-complete gate (full-mask) for INDEX and READ DATA output pulses. 3.4 Auto-chucking at disk installation 3.5 Auto-recalibration at power on 34 pin right-angled header connector Equipped Not equipped
Interface connector Power connector Other optional function
(Table 1-2) Signal interface pin-assignment Pin Nos. 33 Signals NC NC NC 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V Pin Nos. 34 Signals HD IN (HD at HIGH level)/HD OUT (HD at HIGH level)-OPEN NC NC INDEX DRIVE SELECT 0/OPEN DRIVE SELECT 1/OPEN NC MOTOR ON DIRECTION SELECT STEP WRITE DATA WRITE GATE TRACK 00 WRITE PROTECT READ DATA SIDE ONE SELECT DISK CHANGE/READY Direc Input/ Output Input Output Input Input Input Input Input Input Input Input Output Output Output Input Output
The FDD is equipped with a discrimination switch for the high density (HD) hole of an installed disk cartridge. Refer to item 8.3.13 as to the detailed explanation for density mode setting.

2. DISK

(1) Work disk 90mm (3.5-inch) micro floppy disks which are mutually agreed between the customer and TEAC. For 2MB mode : High density disk (2HD) 1MB mode : Normal density disk (2DD) (2) Cleaning disk The FDD does not require any cleaning disk. However, the dry type disk is used when requiring a cleaning disk.
3. PHYSICAL SPECIFICATION
(Table 3-1) Physical specification Width Height Depth Weight External view Cooling Mounting 101.6mm (4.00 in), Nom. 25.4mm (1.00 in), Nom. 145mm (5.71 in), Nom., excluding front bezel 410g (0.90lbs), Nom., 415g (0.91 lbs), Max. See Fig. 3-1. Natural air cooling Mountings for the following directions are acceptable. (a) Front loading, mounted vertically. (b) Front loading, mounted horizontally with spindle motor down. (c) The mounting tilt in items (a) and (b) should be 25 or less with the front bezel up (+) or down (-). However, the disk must not be allowed to eject out of the tray with the tilt from the horizontal level to +25. Note: Mounting directions other than the above will be considered separately. With installation holes on the frame of the FDD. Refer to Fig. 3-1. Sheet metal PPHOX or ABS (applied to HF-C591 and HF-C529) (Complying with UL94-5V)
Installation Material of flame Material of front bezel
(Fig. 3-1) FDD external view
4. OPERATIONAL CHARACTERISTICS
4.1 2MB Mode Data Capacity
(Table 4.1-1) 2MB mode data capacity Recording method Data transfer rate Tracks/disk Innermost track bit density Innermost track flux density Unformatted FM 343.19 (8,717) 686.38 (17,434) 6.25 1,000 0.128 4.096 655.36 0.256 4.608 737.28 0.512 5.12 819.2 MFM 686.38 (17,434) 686.38 (17,434) 12.5 2,000 0.256 8.192 1,310.72 0.512 9.216 1,474.56 1.024 10.24 1,638.4
k bits/s bpmm (bpi) frpmm (frpi)

Formatted

Data capacity
k bytes/track k bytes/disk k bytes/sector 32 sectors/track k bytes/track k bytes/disk k bytes/sector 18 sectors/track k bytes/track k bytes/disk k bytes/sector 10 sectors/track k bytes/track k bytes/disk
4.2 1MB Mode Data Capacity
(Table 4.2-1) 1MB mode data capacity Recording method Data transfer rate Tracks/disk Innermost track bit density Innermost track flux density Unformatted FM 171.61 (4,359) 343.19 (8,717) 3.0.128 2.048 327.68 0.256 2.304 368.64 0.512 2.56 409.6 MFM 343.19 (8,717) 343.19 (8,717) 6.25 1,000 0.256 4.096 655.36 0.512 4.608 737.28 1.024 5.12 819.2
4.3 Disk Rotation Mechanism
(Table 4.3-1) Disk Rotation Mechanism Spindle motor Spindle speed Motor servo method Motor/spindle connection Disk speed Long term speed variation (LSV) Instantaneous speed variation (ISV) Start time Average latency Ready waiting time DC brushless motor 300rpm Frequency servo by ceramic oscillator Motor shaft direct The same as the spindle speed. 1.5% or less 2% or less 480ms or less 100ms 505ms or less for motor on

k bytes/track k bytes/disk k bytes/sector 16 sectors/track k bytes/trac k bytes/disk k bytes/sector 9 sectors/track k bytes/track k bytes/disk k bytes/sector 5 sectors/track k bytes/track k bytes/disk

4.4 Index Detection

(Table 4.4-1) Index Detection Number of index Detection method Detection cycle Index burst detecttion timing error (with specified test disk) 1 per disk revolution Rotor detection of spindle motor by Hall element or FG output. 200ms 1.5% 400s or less

4.5 Track Construction

(Table 4.5-1) Track Construction Track density Number of cylinders Number of tracks Outermost track radius (track 00) Innermost track radius (track 79) Positioning accuracy 5.3 tracks/mm (135tpi) Track pitch 187.5m 80 cylinders 160 tracks/disk Side 0 39.500mm (1.5551 in) Side 1 38.000mm (1.4961 in) Side 0 24.6875mm (0.9719 in) Side 1 23.1875mm (0.9129 in) 15m or less, with specified test disk (Track 40, 23 2C, 45 ~ 55%RH, horizontal)

4.6 Magnetic Head

(Table 4.6-1) Magnetic Head Magnetic head Effective track width after trim erase Read/write gap azimuth error Read/write head with erase gap, 2 sets 0.115 0.008mm (0.0045 0.0003 in) 0 18, with specified test disk

4.7 Track Seek Mechanism

(Table 4.7-1) Track Seek Mechanism Head position mechanism Stepping motor Stepping motor drive Track 00 detection method Track to track time Settling time Average track seek time Stepping motor and lead screw 4-phase, 20 steps per revolution 2 steps per track Photo-interrupter 3ms (excludes settling time, refer to item 8.3.4) 15ms or less (excludes track to track time) 94ms (includes settling time)
4.8 Window Margin and Others
(Table 4.8-1) Window Margin and Others Window Margin (with specified test disk, MFM method , PLL separator) 2MB mode 300ns or more 1MB mode 600ns or more Recommendable write pre-compensation 2MB mode 125ns 1MB mode 0 ~ 125ns Head load mechanism File protect mechanism Disk detection mechanism Disk inserting force Disk ejecting force Acoustic noise at 50cm Disk type descriminating mechanism Not equipped (The FDD becomes head load condition whenever a disk is installed.) Detection of write inhibit hole by switch Detection of disk installation by switch 6.86N (700g) or less at the center of disk 13.73N (1400g) or less 50dBA or less at 3ms or 4ms seek operation Detection of HD hole by switch

5. ENVIRONMENTAL CONDITIONS
(Table 5-1) Environmental Condition Operating 4 ~ 51.7C (39 ~ 125F) 20C (36F) or less per hour 20 ~ 80% (no condensation) Max. wet bulb temperature shall be 29.4C (85F) 14.7m/s2 (1.5G) or less (10 ~ 100Hz, 1 octave/ min sweep rate) Vibration 9.8m/s2 (1.0G) or less (100 ~ 200Hz, 1 octave/ min sweep rate) 4.9m/s2 (0.5G) or less (200 ~ 600Hz, 1 octave/ min sweep rate) Write & read: 49m/s2 (5G)(11ms, 1/2 sine wave) or less Shock Read only: 98m/s2 (10G)(11ms, 1/2 sine wave) or less 300m (980feet) ~ 5,000m (16,400feet) Altitude 686m/s2 (70G) (11ms, 1/2 sine wave) or less Storage 22~60C (8 ~ 140F) 30C (54F) or less per hour 5 ~ 90% (no condensation) Max. wet bulb temperature shall be 40C (104F) Transportation 40 ~ 65C (40 ~ 149F) 30C (54F) or less per hour 5 ~ 95% (no condensation) Max. wet bulb temperature shall be 45C (113F) 19.6m/s2 (2G) or less (10 ~ 100Hz, 1/4 octave/ min sweep rate)
Ambient temperature Temperature gradient Relative humidity
Notes: The above requirements are applied for the FDD without shipping box. When a long period is required for transportation such as by ship, storage environmental conditions should be applied.

6. RELIABILITY

(Table 6-1) Reliability MTTF MTTR Design component life Disk life Disk insertion Seek operation Preventive maintenance Soft error 30,000 power on hours or more (for typical operation duty) When failure, the FDD should be replaced in unit of the drive and not repaired in unit of parts or assemplies. 5 years passes/track or more 1.times or more 1 107random seeks or more Not required (for typical operation duty) 1 or less per 109 bits read A soft (recoverable) error means that it can be recoverred correcty within three retries. 1 or less per 1012 bits read A hard (unrecoverable) error means that it cannot be recovered correstly within three retries. However, it is recommended to be followed by a recalibration to track 00 and four additional retries. 1 or less per 106 seeks A seek error means that it can seek to a target track within one retry including a recalibration to track 00. Approved by UL, CSA and TV 15kV (150pF, 330) No hard error and/or no component damage occur when the test is applied to the operator access area (front bezel area).
Hard error Error rate Seek error
Safety standard Electro-static dischange test

7. POWER INTERFACE

7.1 Required Power The following specifications are applied at interface connector of the FDD. (1) DC +12V : Not required (2) DC +5V (a) Voltage tolerance :10% (4.5 ~ 5.5V) (b) Allowable ripple voltage :100mVp-p or less (including spike noise) (c) Current and power consumption

(Table 7.1-1) Current and power consumption Operating mode Stand-by Read operation Write operation Seek operation Seek operation peak Spindle motor start 3ms 6ms Average current Typ. Max. 8mA 10mA 0.30A 0.40A 0.30A 0.40A 0.56A 0.66A 0.60A 0.70A 0.9A 1.0A 0.62A 0.70A Average power Typ. Max. 40mW 55mW 1.50W 2.20W 1.50W 2.20W 2.80W 3.63W 3.30W 4.18W 4.50W 5.50W 3.10W 3.85W
Notes: 1. Values of Typ. current and power are specified at 5.0V, while the values of Max. are at 5.5V (+10%) with a disk of large running torque. 2. Stand-by mode is defined at the stop condition of spindle motor and seek operation. 3. Seek operation peak means the operation during the settling (15ms) after the seek conpletion. 4. Rush current flows within 150ms after the motor start. 5. Short time peak current except for power-on surge is less than 1.0A. 6. Refer to item 9.4 as to the current consumption profile.
7.2 Power Interface Connector and Cable (1) Power interface connector
(Table 7.2-1) Power interface connector FDD side connector Pin numbers Protection method for misconnection Connector external view Connector location Power interface connections Cable side matched connector Cable side matched pin TEKCON, P/N 1603-823-04R-54 or equivalent 4 pins Mechanical protection by the shape of connector housing See Fig. 7.2-1. See Fig. 3-1. See Table 7.2-2. AMP P/N 171822-4 (natural color) or equivalent AMP P/N 170204-2 (AWG#20 ~ 26, loose piece) or P/N 170262-2 (AWG#20 ~ 26, strip form) or equivalent
(2) Power interface cable: Any appropriate cables taking the maximum power consumption of the FDD will be acceptable. (Table 7.2-2) Power interface pin-assignment Power voltage DC +5V 0V (0V) (No conection) Pin numbers 3 4
Power interface connector Upper side of the FDD

Pin number PCB

Rear view

FDD side

Cable side

Cable Top view

(Fig. 7.2-1) Power interface connector external view

8. SIGNAL INTERFACE

8.1 Signal Interface Connector and Cable (1) Signal interface connector
(Table 8.1-1) Signal interface Connector FDD side connector Pin numbers and pin pitch Connector external view Connector location Cable side matched connector I-PEX, P/N 5003-001-0346F or equivalent 2.54mm (0.1 in) pitch, 34-pin block header (17-pin double rows, even number pins are upper side of the FDD). See Fig. 8.1-1. See Fig. 3-1. FUJITSU, P/N FCN-747B034-AU/B (closed end) or -AU/O (daisy chain) or equivalent.
Note: It is recommanded to use a polarizing type connector with a projection on the center of the housing to avoid mis-connection. Refer to Fig. 8.1-1. For such a polarizing connector, mark of the connector housing may show pin No.34.
(2) Signal interface cable Maximum cable length :1.5m (5 feet), by terminator of 1k or less (For daisy chain connection, the total cable length should be less than 1.5m).

Upper side of the FDD

Signal interface connector Pin numbers
Rear view Lower side of the FDD
FDD side signal interface connector
Projection (upper side) Cable side signal interface connector

Top view

Side view
(Fig. 8.1-1) Signal interface connector external view
8.2 Electrical Charactristics Vcc means +5V power voltage supplied to the FDD.
8.2.1 FDD side receiver and driver The specification are applicable at the interface connector of the FDD. (Table 8.2.1-1) FDD side receiver and driver Interface driver/reciver LOW level (TRUE) Electrical characteristics of receiver Input signals (TTL level) LOW level input current HIGH level (FALSE) Terminator resistor value See Fig. 8.2-1. 0 ~ 0.7V 5.9mA, Max. (Including terminator current) 2.2V ~ +5V power voltage 1k 5% Terminator (pull-up) resistor is connected to each input. 0 ~ 0.4V 37mA, Max. Depending on host side terminator
LOW level (TRUE) Electrical Output signals characteristics of (Open collector driver driver) Driver sink current capability HIGH level (FALSE) 8.2.2 Host side receiver and driver
(Table 8.2.2-1) Host side receiver and driver Host side driver Driver required sink current Host side receiver Host side terminator resistor value TTL, CMOS, etc. FDD input current Number of daisy chained FDD TTL, CMOS, etc. Terminator is required for each output signal line from the FDD. Usually 1 ~ 2.2k is used. (150 Min.)
FDD PCB Assy Control & R/W LSI (Bi-CMOS) Strap block FG 0V DRIVE SELECT 0 DRIVE SELECT 12 FG Select DS1 RY DISK CHANGE/ READY 34 12P RY34 DC34 34P DC HA HS HI HI2 HO2 HO 2 HD IN/HD OUT HD sensor HD in Ready Disk change DS0 10P DS
Terminators 5V Other input signals Other output signals Open collector drivers
(Fig. 8.2-1) FDD signal interface circuit
8.3 Input/Output Signals In the following, input signals are those transmitted to the FDD while output signals are those transmitted from the FDD. LOW level of the signals is TRUE unless otherwise specified. Refer to Table 1-2 as to the signal needed in this specification.
8.3.1 DRIVE SELECT input signal (1) Signal to select a specific FDD for operation in multiplex control. (2) Only the DRIVE SELECT signal of the same number as of on-state strap is effective. (3) All the input/output signals except for the MOTOR ON and HD IN are valid after this signal is made TRUE. The time required to be valid is 0.5sec, Max. including transmission delay time of the DRIVE SELECT signal through the interface cable. (4) Refer to item 11.1 as to the turn-on condition of the front bezel indicator. (5) Refer to item 11. and Table 1-2 as to the strap setting and the selection of signal function. 8.3.2 MOTOR ON input signal (1) Level signal to rotate the spindle motor. (2) The spindle motor reaches to the rated rotational speed (300rpm) within 480ms after this signal is made TRUE. (3) Refer to item 11.2 as to the rotational condition of the spindle motor. 8.3.3 DIRECTION SELECT input signal (1) Level signal to define the moving direction of the head when the STEP line is pulsed. (2) Step-out (moving away from the center of the disk) is defined as HIGH level of this signal. Conversely, step-in (moving toward the center of the disk) is defined as LOW level of this signal. (3) The signal shall maintain its level for 0.8s, Min. prior to the trailing edge of the STEP pulse. Refer to Fig. 9.2-1. 8.3.4 STEP input signal (1) Negative pulse signal to move the head. The pulse width shall be 0.8s or more and the head moves one track space per one pulse. (2) The access motion (head seek operation) is initiated at the trailing edge of the STEP pulse and completes within 18ms after starting the access including the settling time. (3) For the subsequent motion in the same direction, the STEP pulses should be input with the interval of 3ms or more, while the pulses should be input with the interval of 4ms or more for a direction change. Refer to Fig. 9.2-1. STEP pulses less than 3ms interval for the same direction or less than 4ms interval for a direction change may cause seek error. (4) STEP pulses are ignored and the access motion is not initiated when one of the following conditions is satisfied. (a) The WRITE PROTECT signal is FALSE and the WRITE GATE signal is TRUE. (b) The TRACK 00 signal is TRUE and the DIRECTION SELECT signal is HIGH level (step-out). (c) Step-in operation (DIRECTION SELECT signal is LOW level) from track 81. 8.3.5 WRITE GATE input signal (1) Level signal to erase the written data and to enable the writing of new data. (2) The FDD is set to write mode when the following logical expression is satisfied. WRITE GATE * DRIVE SELECT * WRITE PROTECT

(3) This signal shall be made TRUE after satisfying all of the following conditions. (a) 18ms has been passed after the effective receival of the final STEP pulse. (b) 100s has been passed after the level change of the SIDE ONE SELECT signal. (4) The following operations should not be done at least 650s after this signal is changed to FALSE. (a) Make the MOTOR ON signal FALSE. (b) Start the head seek operation by the STEP pulse. (c) Make the DRIVE SELECT signal FALSE. (d) Change the level of the SIDE ONE SELECT signal. (e) Change the level of the HD IN signal. 8.3.6 WRITE DATA input signal (1) Negative pulse signal to designate the contents of data to be written on a disk. The pulse width should be 0.1s through 1.1s and the leading edge of the pulse is used. (2) WRITE DATA pulses are ignored while either of the following conditions is satisfied. (a) The WRITE GATE signal is FALSE. (b) The WRITE PROTECT signal is TRUE. (3) This signal should be input according to the timing in Fig. 8.3-2. It is recommended to stop the input of the WRITE DATA pulses during the read operation in order to avoid harmful cross talk. 8.3.7 SIDE ONE SELECT input signal (1) Level signal to designate which side of a double sided disk is used for reading or writing. (2) When this signal is HIGH level, the magnetic head on the side 0 surface (lower side) of the disk is selected, while the magnetic head on the side 1 surface (upper side) is selected when this signal is LOW level. (3) The READ DATA pulse on a selected surface is valid more than 100s after the change of this signal level. (4) Write operation (the WRITE GATE signal is TRUE) on a selected surface shall be started more than 100s after the change of this signal level. 8.3.8 TRACK 00 output signal (1) Level signal to indicate that the head is on track 00. (2) This signal is valid more than 2.8ms, after the effective receival of the STEP pulse. 8.3.9 INDEX output signal (1) Negative pulse signal to indicate the start point of a track and one index pulse per one disk revolution is output. (2) INDEX pulse is output when the following logical expression is satisfied. Index detection * DRIVE SELECT * Ready state * Seek-complete Notes: (a) Ready state: The FDD is powered on. A disk is installed. Auto-chucking completed. A motor-on command is TRUE and 505ms, approx. has been passed. An INDEX pulse has been detected after motor-on command. Change the level of the HD IN signal when the strap is on-state. (b) Seek-complete means the state that 15.8 ~ 17.9ms has been passed after the trailing edge of the

final STEP pulse. (3) Fig. 8.3-1 shows the timing of this signal. Leading edge of the pulse shall be used as the reference and pulse width is 1.5ms through 5ms. 8.3.10 READ DATA output signal (1) Negative pulse signal for the read data from a disk composing clock bits and data bits together. (2) Fig. 8.3-3 shows the timing of this signal. Pulse width is 0.15s through 0.8s and the leading edge of the pulse shall be used as the reference. (3) READ DATA pulse is output when the following logical expression is satisfied. Read data detection * DRIVE SELECT * Write operation * Ready state * Seek-complete Notes: (a) Refer to item 8.3.9 as to the ready state. (b) Write operation is the state while the WRITE GATE input signal is FALSE and erase delay time has been passed after the WRITE GATE signal changed to FALSE. (c) Refer to item 8.3.9 as to the seek-complete. (4) Output pulse is valid while all of the following conditions are satisfied. (a) 18ms has been passed after the effective receival of the final STEP pulse. (b) 100s has been passed after the level change of the SIDE ONE SELECT signal. (c) 650s (2MB mode) or 690s (1MB mode) has been passed after the WRITE GATE signal is changed to FALSE. 8.3.11 WRITE PROTECT output signal (1) Level signal to indicate that the write inhibit hole of an installed disk is open. (2) When this signal is TRUE, data on the disk are protected from miserasing and write operation is inhibited. 8.3.12 DISK CHANGE output signal (1) Level signal to indicate that a disk in the FDD is ejected. (2) Refer to item 11. for the strap setting of this signal. (3) This signal changes to TRUE when either of the following conditions is satisfied. (a) Power on. (b) A disk is removed. (4) The signal returns to FALSE when both of the following conditions are satisfied. Refer to Fig. 8.3-4. (a) A disk has been installed. (b) A STEP command is received when the DRIVE SELECT signal is TRUE. 8.3.13 READY output signal (1) (2) (3) (4) Level signal to indicate that the FDD is in ready state (refer to item 8.3.9) for read and write operations. Refer to item 11 as to the strap setting for this signal output. Required time for this signal to be TRUE after the start of the spindle motor is 505ms, Max. When a motor-on command is made FALSE, this signal is also changed to FALSE within 0.3ms.
8.3.14 Input/Output signals for density mode setting (HD IN/HD OUT) Every FDD model, there are any basic methods for setting the density mode of the FDD as shown in the following. Use the applicable method for the FDD in contents shown below. (1) Method A using HD IN input signal (a) HIGH or LOW level of the HD IN signal from host controller is used to designate the density mode of the FDD. There is no output signal from the FDD for disk type identification. (b) Table 8.3.14-1 shows the meaning of the logic level.

(2) Method B without using any interface signal (OPEN) (a) Interface signal is not used between the FDD and host-controller. Density mode of the FDD and host system are determined independently. (b) Density mode of the FDD is automatically set by discriminating the HD hole of an installed disk. If the density mode of the FDD is not coincident with that of the host controller, data errors always occur at read operation. (c) It can not be selected when the HD IN input signal is setted to HIGH DENSITY at LOW level. (3) Method C using HD OUT output signal (a) Density mode of the FDD is automatically set by discriminating the HD hole of an installed disk. (b) HIGH or LOW level of the HD OUT signal from the FDD is used to inform host controller which type of disk is installed in the FDD. And the density mode of the host is automatically determined according to this signal. (c) Table 8.3.14-1 shows the meaning of the logic level. (d) It can not be selected when the HD IN input signal is setted to HIGH DENSITY at LOW level. (4) Method D using HD IN/HD OUT signals (a) HIGH or LOW level of the HD OUT signal from the FDD is used to inform host controller which type of disk is installed in the FDD. Refer to method C. On the other hand, the density mode of the FDD is set by the HIGH or LOW level of the HD IN signal from the host. Refer to method A. (b) Usually both of the density mode of the FDD and the host are the determined according to an installed disk type like method C. For a special case, however, that on installed disk had already been written at unsuitable density, the system can forced (or over write) only using the HD IN signal by operator designation. (c) Table 8.3.14-1 shows the meaning of the logic level. (Table 8.3.14-1) Meaning of the logic level Signal name Logic level HIGH DENSITY at HIGH LEVEL HIGH 2MB mode HD IN LOW 1MB mode HIGH 2HD disk or no disk HD OUT LOW 2DD disk 8.3.15 NO CONNECTION (NC) The NC pins are electrically isolated from any other circuit in the FDD. HIGH DENSITY at LOW LEVEL 1MB mode 2MB mode 2DD disk 2HD disk or no disk
8.3.16 Treatment of not-used signals If some of the provided input/output signals are not necessary for your application, keep the unused signal lines open or pull up by an appropriate resistor value (refer to item 8.2.2) at the host side.
1.5 ~ 5ms INDEX 197 ~ 203ms (300rpm)
(Fig. 8.3-1) INDEX timing WRITE GATE 1 WRITE DATA Magnetization on disk 0.1 ~ 1.1s 8s Max. 2F t1

4/3F t2

* : 0.5%
8s Max. t3 4s, Nom. 8s, Nom.
Density mode 2MB mode 1MB mode

rpm 300 300

t1 2s, Nom. 4s, Nom.

t2 3s, Nom. 6s, Nom.

(Fig. 8.3-2) WRITE DATA timing (MFM method)
Magnetization on disk 1 READ DATA 0.15 ~ 0.8s 2F t4 4/3F t5 4/3F t5 1F t1

t4 2s, Nom. 4s, Nom.

t5 3s, Nom. 6s, Nom.

t6 4s, Nom. 8s, Nom.

t7 350ns 700ns
(Fig. 8.3-3) READ DATA timing (MFM method)
Power on Installed Disk installation STEP DISK CHANGE

Disk eject

Disk install Installed

Ejected

1s, Max. 1s, Max.
Note: To simplify the timing chart, the DRIVE SELECT signal is assumed always TRUE in the above figure. (Fig. 8.3-4) DISK CHANGE signal timing

9. CONTROL SEQUENCE

9.1 Power-on (1) Protection against power on and off (a) In the transient period when the +5V power is lower than 3.5V, the FDD is protected against miswriting and miserasing whatever the state of input signals are. (b) Except for the condition of item (a), the FDD is protected against miswriting and miserasing as long as the WRITE GATE input signal does not change to TRUE. (2) Power reset time in FDD: Less than 400ms, including auto-recalibration
+5V power Valid interface signals

3.5 ~ 4.4V

Valid Power resetting 400ms, Max. with auto-recalibration
Internal miswrite protection
(Fig. 9.1-1) Power on sequence
9.2 Seek Operation Seek operation can be done independently of the spindle motor rotation.

t1 t1 t1 t1

DRIVE SELECT Step-out DIRECTION SELECT STEP t1 650s Min. WRITE GATE TRACK 00 2.8ms, Max. t1 0.8s t2 2s t2 3ms Min. t1

Step-in

t1 t1 4ms, Min. 3ms Min.

1s, Max.

(Fig. 9.2-1) Seek operation timing

9.3 Read Write Operation

(650s, Min.) MOTOR ON (650s, Min.) DRIVE SELECT 500ms, Max. READY Valid INDEX 15.8~17.9ms (Seek-complete) STEP 3ms, Min. WRITE GATE 8s, Max. WRITE DATA 18ms, Min. 0, Min. 0, Min. 100s, Min. SIDE ONE SELECT 100s, Max. READ DATA Valid Valid Valid Valid 15.8~17.9ms (Seek-complete) Other input signals Other output signals 0.5s, Max. Valid Valid 100s, Max. (650s,Min.) 650s,Max. (2MB mode) 690s,Max. (1MB mode) 8s, Max. 650s, Min. 0.3ms, Max.
(Fig. 9.3-1) Read/Write operation timing
9.4 Current Consumption Profile
mA 0 Initial reset Auto-recalibration FDD status

Stand -by Stand -by

+5V typical average current High current (350ms, Max.) 15ms from the last step
Read Seek Read Write Read

Stand-by Drive selected

Motor start Auto-chucking Power on Motor-on command DRIVE SELECT STEP Spindle motor power Steppin motor power Read write amp. power Logic power on Start rush Disk installation

off on off

(Fig. 9.4-1) Typical average current profile
(1) Stand-by mode When both of the following conditions are satisfied, FDD goes to the stand-by mode (low power consumption mode). (a) The spindle motor stops. (b) Not in the seek operation (including the settling time). Note: In the stand-by mode, the FDD can immediately respond to a command from host controller with no restriction. If the polling operation of the DRIVE SELECT line is done in the stand-by mode, current flows intermittently and +5V current slightly increases. (2) Simultaneous operation of motor start and seek If a seek operation is done during the start-up of the spindle motor, or if the motor starts during the seek operation, +5V current at motor start increases by 0.55A, Max. from the value in Table 7.1-1. Stepping motor is energized at high power from the first STEP to 15msec after the last STEP. (3) +5V current increases for 15ms after a lapse of 500ms by engergizing of the motor.

10. FRAME GROUNDING

(1) The FDD frame is electrically connected to DC 0V by the FG strap on the main PCBA. (See Fig. 10-1) (2) If it is required to separate the FDD frame from DC 0V, remove the FG strap. However, the FDD frame must be electrically connected to DC 0V by some other method when the FDD is tested alone. (3) If it is required to connect the FDD frame to the host side by other cabling method, M2.6 tapped hole at the rear side of the FDD can be used. (See Fig. 3-1). FDD Main PCBA FG strap Interface connector (0V)

PCBA mounting screw

Frame ground tapped hole (M2.6)
(Fig. 10-1) Frame ground internal connection
11. CUSTOMER SELECTABLE STRAPS
11.1 Function Summary of Straps The FDD is equipped with the following selectable straps on the main PCBA. Insertion of a short bar onto the post pin is defined as the on-state of the strap. Refer to Table 1-1 in item 1. as to the strap setting at delivery and selectable straps.

DC DC34

HI HA HS E
2 HO2 HO Strap post layout F

RY RY34 34P C D

(Table 11.1-1) Function summary straps Strap DS0 DS1 *RY34 *DC34 *HA *HI2 *HO2 FG Function DRIVE SELECT 0 input on pin 10 DRIVE SELECT 1 input on pin 12 READY output on pin 34 DISK CHANGE output on pin 34 Density set automatically Density set by HD IN on pin 2 HD OUT output on pin 2 Short between FDD frame and DC 0V
Notes : *straps overlap with other strap posts. Insert a short bar according to your priority.
11.2 DS0/DS1 Straps (1) In the multiplex control, these straps designate the address of the FDD. (2) By the combination with the DRIVE SELECT 0 ~ 1 signals, two addresses, Max. can be designated. Refer to Fig. 8.2-1 and Table 11.1-1.
11.3 HA/HI2/HO2 Straps (1) Straps to select a designating method of the density mode and to select a signal pin number. (2) Table 11.3-1 shows the combination of the straps and selectable functions. (3) Refer to Table 11.1-1 as to selection of signal pin number and overlapping with the other strap function.
(Table 11.3-1) Designating methods for density mode Strap setting Sel. No. HO2 HI2 HA A B C ON ON ON ON Input Pin 2 HD IN OPEN OPEN Output Pin 2 OPEN OPEN HD OUT Density designation Host side FDD Key-in or software Key-in or software HD IN from host Automatic by sensor
HD OUT from Automatic by FDD sensor
Notes : 1. "-" mark indicates the off-state of the strap. 2. Refer to Table 11.1-1 as to overlapping with the other strap functions. 3. Refer to item 8.3.14 as to the detailed signal functions.
11.4 RY34/DC34 Straps (1) RY34 strap is used to output the READY signal on interface pin No.34. (2) DC34 strap is used to output the DISK CHANGE signal on interface pin No.34. (3) Refer to Table 11.1-1 as to selection of signal pin number and overlapping with the other strap functions. 11.5 FG Strap FG strap is used to electrically connect the FDD frame to DC 0V. Refer to item 10. as to the detailed explanation.
12. TURN ON CONDITION OF INDICATOR AND SPINDLE MOTOR
12.1 Front Bezel Indicator The indicator (LED) turns on while the DRIVE SELECT signal is TRUE. However, the indicator keeps off until 3.1ms has passed after the DRIVE SELECTion to avoid the polling operation of the DRIVE SELECT signal.
12.2 Spindle Motor (1) The spindle motor rotates while the MOTOR ON signal is TRUE. However, the spindle motor does not rotate at any condition while no disk is installed. (2) An auto-chucking operation is executed during the time of each disk installation by rotating the spindle motor for 490ms approx. (500ms max.). All the interface signals are valid according to the explanation in item 8.3 while the auto-chucking operation is in progress.

 

Technical specifications

General
Device TypeFloppy disk drive
Enclosure TypeInternal
Enclosure ColorIvory
InterfaceFloppy
Width4 in
Depth5.7 in
Height1 in
Weight0.9 lbs
Storage Removable
TypeFloppy disk - 3.5" x 1/3H
Capacity1.44 MB
Media TypeFloppy disk - 3.5"
Average Seek / Access Time94 ms
Hard Drive
TypeNone.
Expansion / Connectivity
Interfaces1 x floppy interface - 34 pin IDC
Compatible Bays1 x front accessible - 3.5" x 1/3H
Miscellaneous
MTBF30,000 hour(s)
Compliant StandardsPlug and Play
Software / System Requirements
OS RequiredMicrosoft DOS, Microsoft Windows 95, Microsoft Windows 3.11, Microsoft Windows 3.1, Microsoft Windows NT
Min RAM Size4 MB
Environmental Parameters
Min Operating Temperature39.2 °F
Max Operating Temperature125.1 °F
Humidity Range Operating20 - 80%
Universal Product Identifiers
BrandTeac
Part NumbersFD235HFC291/CS, FD235HFC291/S
GTIN00043774017119

 

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