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31 sheets in total teac FD-235HF-A429 micro floppy disk drive specification rev. a 1332
C i C 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 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 ............................................................................................. 2 6 10. frame grounding ........................................................................................................... .. 28 11. turn on condition of indicator and spindle motor ......................................... 28 11.1 front indicator .......................................................................................................... ......... 28
C ii C 11.2 spindle motor ............................................................................................................ ........ 28
C 1 C 1. outline this specification provides a description for the teac fd-235hf, dual density (2/1mb, 2-modes), 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 FD-235HF-A429 front bezel black eject button black led indicator green safety standard ul, csa & tv operation modes 2mb mode write and read 1mb mode write and read 3.5 inch disk used high density (2hd) normal density (2dd) unformatted data capacity 2m bytes 1m bytes data transfer rate 500k bits/s 250k bits/s disk rotational speed 300rpm 300rpm track density 5.3track/mm (135tpi) track to track time 3ms required power +5v single (4.5 ~ 5.5v) signal output driver open collector ttl input signal pull-up 1k w 30% function setting at delivery 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. interface connector 34 pin right-angled header connector power connector equipped other optional function not equipped
C 2 C 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 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 which is mutually agreed between the customer and teac is used when requiring a cleaning disk. (table 1-2) signal interface pin-assignment pin nos. signals pin nos. signals direc 1nc2nc C 3p. key4nc C 5nc6nc C 7 0v 8 index output 90v10nc C 11 0v 12 drive select 1 input 13 0v 14 nc C 15 0v 16 motor on input 17 0v 18 direction select input 19 0v 20 step input 21 0v 22 write data input 23 0v 24 write gate input 25 0v 26 track 00 output 27 0v 28 write protect output 29 0v 30 read data output 31 0v 32 side one select input 33 0v 34 disk change output
C 3 C 3. physical specification (table 3-1) physical specification width 101.6mm (4.00 in), nom. height 25.4mm (1.00 in), nom. depth 145mm (5.71 in), nom., excluding front bezel weight 345g (0.76lbs), nom., 360g (0.79 lbs), max. external view see fig.3-1. cooling natural air cooling mounting mountings for the following directions are acceptable. (a) front loading, mounted vertically. (b) front loading, mounted horizontally with spindle motor down. (c) mounting angle in items (a) and (b) should be less than 25 with front bezel up or down. note: as to the other mounting directions than the above will be considered separately. installation with installation holes on the frame of the fdd. refer to fig.3-1. material of flame aluminium die-cast material of front bezel pphox (complying with ul94-5v)
C 4 C (fig. 3-1) fdd external view bottom side stepping motor signal connector spindle motor pin 1 frame ground tap, m2.6 eject button position 51 (disk inserted) 11 (disk ejected) 10-m3 tapped holes for installation (bottom 4, each side 3) main pcba disk insertion front bezel disk inertion window eject button indicator (led) (units: mm)
C 5 C 4. operational characteristics 4.1 2mb mode data capacity (table 4.1-1) 2mb mode data capacity recording method fm mfm data transfer rate (k bits/sec) 250 500 tracks/disk 160 160 innermost track bit density (bpi) 8,717 17,434 innermost track flux density (frpi) 17,434 17,434 data capacity unformatted k bytes/track 6.25 12.5 k bytes/disk 1,000 2,000 32 sectors/track k bytes/sector 0.128 0.256 k bytes/track 4.096 8.192 k bytes/disk 655.36 1,310.72 18 sectors/track k bytes/sector 0.256 0.512 k bytes/track 4.608 9.216 k bytes/disk 737.28 1,474.56 10 sectors/track k bytes/sector 0.512 1.024 k bytes/track 5.12 10.24 k bytes/disk 819.2 1,638.4 formatted
C 6 C 4.2 1mb mode data capacity 4.3 disk rotation mechanism (table 4.2-1) 1mb mode data capacity recording method fm mfm data transfer rate (k bits/sec) 125 250 tracks/disk 160 160 innermost track bit density (bpi) 4,359 8,717 innermost track flux density (frpi) 8,717 8,717 data capacity unformatted k bytes/track 3.125 6.25 k bytes/disk 500 1,000 formatted 16 sectors/track k bytes/sector 0.128 0.256 k bytes/trac 2.048 4.096 k bytes/disk 327.68 655.36 9 sectors/track k bytes/sector 0.256 0.512 k bytes/track 2.304 4.608 k bytes/disk 368.64 737.28 5 sectors/track k bytes/sector 0.512 1.024 k bytes/track 2.56 5.12 k bytes/disk 409.6 819.2 (table 4.3-1) disk rotation mechanism spindle motor dc brushless motor spindle speed 300rpm motor servo method frequency servo by ceramic oscillator motor/spindle connection motor shaft direct disk speed the same as the spindle speed. long term speed variation (lsv) 1.5% or less instantaneous speed variation (isv) 2% or less start time 480ms or less average latency 100ms
C 7 C 4.4 index detection 4.5 track construction 4.6 magnetic head (table 4.4-1) index detection number of index 1 per disk revolution detection method rotor detection of spindle motor by hall element or fg output. detection cycle 200ms 1.5% index burst detecttion timing error (with specified test disk) 400s or less (table 4.5-1) track construction track density 5.3 tracks/mm (135tpi) track pitch 187.5m number of cylinders 80 cylinders number of tracks 160 tracks/disk outermost track radius (track 00) side 0 39.500mm (1.5551 in) side 1 38.000mm (1.4961 in) innermost track radius (track 79) side 0 24.6875mm (0.9719 in) side 1 23.1875mm (0.9129 in) positioning accuracy 15m or less, with specified test disk (track 40, 23 2c, 45 ~ 55%rh, horizontal) (table 4.6-1) magnetic head magnetic head read/write head with erase gap, 2 sets effective track width after trim erase 0.115 0.008mm (0.0045 0.0003 in) read/write gap azimuth error 0 18, with specified test disk
C 8 C 4.7 track seek mechanism 4.8 window margin and others (table 4.7-1) track seek mechanism head position mechanism stepping motor and lead screw stepping motor 4-phase, 20 steps per revolution stepping motor drive 2 steps per track track 00 detection method photo-interrupter track to track time 3ms (excludes settling time, refer to item 8.3.4) settling time 15ms or less (excludes track to track time) average track seek time 94ms (includes settling time) (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 not equipped (the fdd becomes head load condition whenever a disk is installed.) file protect mechanism detection of write inhibit hole by switch disk detection mechanism detection of disk installation by switch disk inserting force 6.86n (700g) or less at the center of disk disk ejecting force 13.73n (1400g) or less acoustic noise at 50cm 50dba or less at 3ms or 4ms seek operation disk type descriminating mechanism detection of hd hole by switch auto-recalibration automatic recalibration to track 00 is executed immediately after power-on.
C 9 C 5. environmental conditions (table 5-1) environmental condition operating storage transportation ambient temperature 4 ~ 51.7c (39 ~ 125f) C22~60c (C8 ~ 140f) C40 ~ 65c (C40 ~ 149f) temperature gradient 20c (36f) or less per hour 30c (54f) or less per hour 30c (54f) or less per hour relative humidity 20 ~ 80% (no condensation) max. wet bulb temperature shall be 29.4c (85f) 5 ~ 90% (no condensation) max. wet bulb temperature shall be 40c (104f) 5 ~ 95% (no condensation) max. wet bulb temperature shall be 45c (113f) vibration 14.7m/s 2 (1.5g)i or less (10 ~ 100hz, 1 octave/m sweep rate) 19.6m/s 2 (2g) or less (10 ~ 100hz, 1/4 octave/ m sweep rate) 9.8m/s 2 (1.0g) or less (100 ~ 200hz, 1 octave/ m sweep rate) 4.9m/s 2 (0.5g) or less (200 ~ 600hz, 1 octave/ m sweep rate) shock write & read: 49m/s 2 (5g)(11ms, 1/2 sine wave) or less 686m/s 2 (70g) (11ms, 1/2 sine wave) or less read only: 98m/s 2 (10g)(11ms, 1/2 sine wave) or less altitude C300m (C980feet) ~ 5,000m (16,400feet) 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.
C 10 C 6. reliability (table 6-1) reliability mttf 30,000 power on hours or more (for typical operation duty) mttr when failure, the fdd should be replaced in unit of the drive and not repaired in unit of parts or assemplies. design component life 5 years disk life 3 10 6 passes/track or more disk insertion 1.5 10 4 times or more seek operation 1 10 7 random seeks or more preventive maintenance not required (for typical operation duty) error rate soft error 1 or less per 10 9 bits read a soft (recoverable) error means that it can be recoverred correcty within three retries. hard error 1 or less per 10 12 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. seek error 1 or less per 10 6 seeks a seek error means that it can seek to a target track within one retry including a recalibration to track 00. safety standard approved by ul, csa and tv electro-static dischange test 15kv (150pf, 330 w ) no hard error and/or no component damage occur when the test is applied to the operator access area (front bezel area).
C 11 C 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 average current average power typ. max. typ. max. stand-by 8ma 10ma 40mw 55mw read operation 0.30a 0.40a 1.50w 2.20w write operation 0.30a 0.40a 1.50w 2.20w seek operation 3ms 0.56a 0.66a 2.80w 3.63w 6ms 0.60a 0.70a 3.30w 4.18w seek operation peak 0.9a 1.0a 4.50w 5.50w spindle motor start 0.62a 0.70a 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 6. 4 as to the current consumption profile.
C 12 C 7.2 power interface connector and cable (1) power interface connector (2) power interface cable: any appropriate cables taking the maximum power consumption of the fdd will be acceptable. (table 7.2-1) power interface connector fdd side connector honda tsushin kogyo co. ltd., p/n z-419e or equivalent pin numbers 4 pins protection method for mis- connection mechanical protection by the shape of connector housing connector external view see fig.7.2-1. connector location see fig.3-1. power interface connections see table 7.2-2. cable side matched connector amp p/n 171822-4 (natural color) or equivalent cable side matched pin amp p/n 170204-2 (awg#20 ~ 26, loose piece) or p/n 170262-2 (awg#20 ~ 26, strip form) or equivalent (table 7.2-2) power interface pin-assignment power voltage pin numbers dc +5v 1 0v 2 (0v) 3 (no conection) 4
C 13 C (fig. 7.2-1) power interface connector external view power interface connector pin number pcb upper side of the fdd rear view top view fdd side cable side cable 43 2 1 4 32 1
C 14 C 8. signal interface 8.1 signal interface connector and cable (1) signal interface connector (2) signal interface cable maximum cable length : 2m (6.6 feet), by terminator of 1k w 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. (table 8.1-1) signal interface connector fdd side connector fujitsu, p/n fcn-725p034-au/a2#32 or equivalent pin numbers and pin pitch 2.54mm (0.1 in) pitch, 34-pin block header (17-pin double rows, even number pins are upper side of the fdd). connector external view see fig.8.1-1. connector location see fig.3-1. cable side matched connector 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.
C 15 C (fig. 8.1-1) signal interface connector external view upper side of the fdd signal interface connector pin numbers lower side of the fdd projection (upper side) fdd side signal interface connector cable side signal interface connector rear view top view side view 3p delete 2 34 2 1 34 33
C 16 C 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. 8.2.2 host side receiver and driver (table 8.2-1) fdd side receiver and driver interface driver/reciver see fig.8.2-1. electrical characteristics of receiver input signals (ttl level) low level (true) 0 ~ 0.7v low level input current 5.9ma, max. (including terminator current) high level (false) 2.2v ~ +5v power voltage terminator resistor value 1k w 5% terminator (pull-up) resistor is connected to each input. electrical characteristics of driver output signals (open collector driver) low level (true) 0 ~ 0.4v driver sink current capability 37ma, max. high level (false) depending on host side terminator (table 8.2-2) host side receiver and driver host side driver ttl, cmos, etc. driver required sink current fdd input current number of daisy chained fdd host side receiver ttl, cmos, etc. terminator is required for each output signal line from the fdd. host side terminator resistor value usually 1 ~ 2.2k w is used. (150 w min.)
C 17 C (fig. 8.2-1) fdd signal interface circuit control & r/w lsi (bi-cmos) fdd pcb assy select 5v open collector drivers terminators drive select other input signals other output signals
C 18 C 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.
C 19 C (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.
C 20 C 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.
C 21 C 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. (fig. 8.3-1) index timing (fig. 8.3-2) write data timing (mfm method) (table 8.3.13-1) meaning of the logic level signal name logic level low level at high density hd out high 2dd disk low 2hd disk density mode rpm t1 t2 t3 2mb mode 300 2s, nom. 3s, nom. 4s, nom. 1mb mode 300 4s, nom. 6s, nom. 8s, nom. index 1.5 ~ 5ms 197 ~ 203ms (300rpm) ~ 1 111 00 0 ~ ~ ~ ~ ~ write gate write data 0.1 ~ 1.1s 8s max. 2f t1 4/3f t2 4/3f t2 1f t3 max. 8s * * * * * : 0.5% magnetization on disk
C 22 C (fig. 8.3-4) disk change signal timing density mode rpm t4 t5 t6 t7 2mb mode 300 2s, nom. 3s, nom. 4s, nom. 350ns 1mb mode 300 4s, nom. 6s, nom. 8s, nom. 700ns (fig. 8.3-3) read data timing (mfm method) read data 0.15 ~ 0.8s 2f t4 4/3f t5 4/3f t5 1f t6 11 0 01 01 magnetization on disk power on disk eject disk install installed ejected installed 1s, max. 1s, max. disk installation step disk change note: to simplify the timing chart, the drive select signal is assumed always true in the above figure.
C 23 C 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 (fig. 9.1-1) power on sequence 3.5 ~ 4.4v +5v power valid interface signals internal miswrite protection power resetting 400ms, max. with auto-recalibration valid
C 24 C 9.2 seek operation seek operation can be done independently of the spindle motor rotation. (fig. 9.2-1) seek operation timing t1 t1 t1 t1 step-out step-in t1 t2 t1 t1 t1 t1 650 m s 3ms 4ms, min. 3ms min. min. min. 2.8ms, max. 1s, max. drive select direction select step write gate track 00 t1 3 0.8s t2 3 2s ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
C 25 C 9.3 read write operation (fig. 9.3-1) read/write operation timing (650 m s, min.) (650 m s, min.) 500ms, max. 0.3ms, max. va l i d 15.8~17.9ms (seek-complete) 3ms, min. 650s, min. 8s, max. 8s, max. 18ms, min. (650s,min.) 0, min. 100s, min. 0, min. 650s,max. (2mb mode) 690s,max. (1mb mode) 100s, max. 100s, max. valid valid valid valid 15.8~17.9ms (seek-complete) va l i d va l i d 0.5s, max. motor on drive select ready index step write gate write data side one select read data other input signals other output signals
C 26 C 9.4 current consumption profile (fig. 9.4-1) typical average current profile ma high current (350ms, max.) +5v typical average current 800 600 400 200 0 15ms from the last step initial reset auto-recalibration stand -by stand -by auto-chucking motor start read seek read read write stand-by drive selected disk installation power on fdd status motor-on command drive select step spindle motor power steppin motor power read write amp. power logic power start rush on 0 0 off on C off
C 27 C (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.
C 28 C 10. frame grounding the fdd frame is electrically connected to dc 0v by the mounting screw of the main pcba. (see fig.10-1). (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. pcba mounting screw fg interface connector (0v) fdd main pcba frame ground tapped hole (m2.6)

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