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RS 237-088 Manual

5.25"
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1.0
Introduction
1.1
General description
This drive is a high-density, dual speed, double-sided 5.25" mini-floppy disk drive.
The speed is controlled by Pin #2 of the interface connector. Normally, when this pin
is at logical low, the transfer rate is low and when at logical high, the transfer rate is
high. This drive can be used as a high-density 1.6Mb drive. When at logical low,
this drive can be used as a standard 1.0Mb drive.
Table 1-1. Compatibility with other model drives
FDD used
Double-sided
48 t.p.i.
Double-sided
96 t.p.i.
Dual-speed
5.25" Floppy Disk Drive
Stock No. 237-088
Diskette written
Diskette
Capacity
MD
0.5Mb
MD
1.0Mb
HD
1.6Mb
1.0Mb
MD
Rotational
Rotational
speed
360 r.p.m.
300 r.p.m.
300 r.p.m.
360 r.p.m.
300 r.p.m.
300 r.p.m.
360 r.p.m.
360 r.p.m.
360 r.p.m.
360 r.p.m.
300 r.p.m.
360 r.p.m.
300 r.p.m.
360 r.p.m.
1
Read by this drive
Transfer rate
speed
300Kbits/sec
250Kbits/sec
300Kbits/sec
250Kbits/sec
500Kbits/sec
300Kbits/sec
250Kbits/sec
300Kbits/sec
250Kbits/sec

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Summary of Contents for RS 237-088

  • Page 1 5.25" Floppy Disk Drive Stock No. 237-088 Introduction General description This drive is a high-density, dual speed, double-sided 5.25" mini-floppy disk drive. The speed is controlled by Pin #2 of the interface connector. Normally, when this pin is at logical low, the transfer rate is low and when at logical high, the transfer rate is high.
  • Page 2 Key features: ¥ Compact half-height size. ¥ 1.0 or 1.6Mb storage capacity (unformatted). ¥ Backward compatibility to 48 t.p.i. ¥ 3ms track to track access time. ¥ Brushless dual-speed direct-drive motor. ¥ Low power consumption. ¥ 10,000 hours MTBF. ¥ Dual read channels.
  • Page 3 1.2.2 Functional specifications Mini mode Maxi mode Rotational speed 300 r.p.m. 360 r.p.m. Recording density (innermost track) MFM recording 5,922 b.p.i. 9,870/9,642 b.p.i. FM recording 2,961 b.p.i. 4,935/4,821 b.p.i. Flux density (innermost track) MFM recording 5,922 f.c.i. 9,870/9,642 f.c.i. FM recording 5,922 f.c.i.
  • Page 4 1.2.5 Power requirements Item Rating Voltage 12V±10% Max ripple 100mVp-p 0.54A (max.) Seek 0.35A (typ) 0.27A (max.) Current During operation Read 0.22A (typ) 0.35A (max.) Write 0.28A (typ) 0.9A(Max) At motor start 0.7A(Typ) Voltage 5V ±5% max. ripple 50mVp-p 0.41A (max.) Seek 0.34A (typ) Power...
  • Page 5 Figure 1-1. D.C. power profile of power consumption Current 10.0 Max. power consumption Power 12V current typ Typ power Consumption 5V current typ Motor ON Seek Write Read Stand by 4. Peak currents are as specified in figures 2-3. Functional characteristics This drive consists of read/write and control electronics, drive mechanism, read/write heads, and precision track position mechanism.
  • Page 6 Low pass filter. 1.3.2 Drive mechanism drive motor under servo speed control (using a frequency generator) rotates the spindle motor at 300 or 360 r.p.m. through a direct-drive system. An expandable collet/spindle assembly provides precision media positioning to ensure data interchange.

  • Page 7: Electrical Interface

    Figure 1-2. Functional diagram In use/spare (option) Step In use LED Direction Select Drive select (4 lines) Index Index detector ¯1 Track 0 Control ¯1 logic Index Stepping ¯2 Motor on motor ¯2 Side select Ready/drive status Track 0 Track 0 Mode select detector Media...
  • Page 8 All lines in the signal interface are digital in nature and provide signals to the drive (input), or to the host (output), by way of the interface connector J1. power connector, J2, provides +5V and +12V power. Figure 2-1. Interface connection Drive select 1 Index Drive select 2...
  • Page 9 Signal interface This drive uses the industry standard open-collector, low-level - true, multiplexed interface convention. The industry standard open-collector, 40mA TTL driver 7438 or equivalent, is used to transmit the I/O signals. The transmitted signals are detected by the hysteresis input inverter, 7414 or equivalent. A 150½ pull-up resistor between the signal line and +5V is necessary on the receiving circuit.
  • Page 10 2.2.1 Drive select 1, 2, 3, or 4 (J1 pins #10, 12, 14, and 6) Four separate input lines, drive select 1, drive select 2, drive select 3, and drive select 4 are provided so that in standard configuration, up to four drives may be multiplexed together in a system that have separate drive select lines.
  • Page 11 First the drive should be selected and "direction select" should be set to its correct logic level, then "step" should be set to a logic low level. A minimum of 1µs is necessary before the step signal may make its low-to-high transition (trailing edge of "step") to initiate head-carriage movement.
  • Page 12 2.2.7 Side select (J1 pin #32) "Side select" determines which side of a double-sided diskette is to be written on or read from. A logic low (true or logic zero) selects the side 1 head; a logic high (false or one) selects the side 0 head. When switching from one side to another, a 100µs delay is required before a read or write operation can be initiated.
  • Page 13 2.3.2 Track 00 (J1 pin #26) An active low on this signal line indicates that the read/write head is positioned at track zero (the outermost track). This signal is at a logic high when the read/write head is not at track zero. When the read/write head is at track zero and an additonal step-out pulse is issued to the drive, the microprocessor logic will keep the read/write head positioned at track zero.
  • Page 14 Figure 2-3. Timing diagram of disk change Power On Insert Insert Media Drive select Step Pin#34 * Pin #34 is gated by "drive select" signal when "TH" plug is opened. Pin #34 is not gated by "drive select" signal when "TH" plug is closed. Power interface The drive only requires power for operation.
  • Page 15 Figure 2-4. D.C. power profile Typical current 0.7A typ 250ms max. 0.69A typ 0.6A typ 1ms typ 0.5A typ 2ms typ 4ms max. Motor on Settled ON Standby Seek rate Write Read track spindle running Frame ground Frame ground for the drive is provided by a push-on tab terminal, mounted directly on the rear of the drive.
  • Page 16 The 5V and 12V return lines should be connected together at the host system, but these power supply return lines should be isolated from the system frame ( ground. These return lines are isolated from the frame ground on the drive PCB by a 0.01µF capacitor and 100k½...
  • Page 17 5. D.C distribution - separate twisted pair cable from each device to the supplies (as shown in four places). The wire size must be large enough to maintain a level less than 10mV/ft drop. Functional operations 2.7.1 Power sequencing Applying power to the drive can be done in any sequence.
  • Page 18 Writing data to the drive is accomplished by: a. Activating the DRIVE SELECT line. b. Selecting the head. c. Activating the WRITE GATE line. d. Pulsing the WRITE DATA line with the data to be written. The timing specifications for the write data pulse are shown in Figure 2-8 for high speed operation, and Figure 2-9 for low-speed operation.
  • Page 19 Figure 3-1. Plug location FPK0581xB3C Table 3-1. Plug options Plug Shipped from factory Description designation Open Short Drive select 2 Drive select 1 DS3,4 Drive select 3,4 Activity LED with "drive select" Activity LED with "drive select and "in use" Enables drive motor with "drive select"...
  • Page 20 Table 3-2. Wire jumper options Shipped from factory Plug designation Description Open Short Switch to the 96 t.p.i. or 48 t.p.i. Switch to the 96 t.p.i. or 48 t.p.i. Note: ST, OF ..not used (factory use only). Plug/wire options 3.2.1 OP/AT/AX/BX/1M plug Spindle...
  • Page 21 Note 1: #1 : High density - 360 r.p.m., Low density - 300 r.p.m. Note 2: #2 : The density changes according to pin #2's logic level of the J1 I/O interface. (H: high density, L: low density.) Note 3: L - #2 : The density changes according to the latched value of pin #2's logic level. The latching operation occurs when the drive is selcted from a deselected state.
  • Page 22 3.2.4 DS 2 (1,3,4) plug DS1 - DS4 Drive selection The drive is selected when the DRIVE SELECT signal is low. Closed Note: Among the 4 options (DS1-DS4), only one jumper plug should be mounted. 3.2.5 RDY/DC plugs Pin #34 of J1 I/O interface READY When a media is inserted, the motor is up to speed, and at least 2 Closed...

  • Page 23: Timing Diagram

    Operation procedures and precautions Power-on procedure power supply can be turned on in any order. The write gate signal should be held at a high level so that the power-on action does not cause illegal writing. An interval of 700ms is necessary between power-on time and operation-start time. After powering on, the initial position of the read/write head is at Track 00.
  • Page 24 Figure 5-1. Step timing Drive select 1ms min. Forward Reverse Direction select 1ms min. 18ms min. 1ms min. 500ns min 1ms min. Step 1ms min. min. 2.9ms max. 2ms max. 50ms max. Track 0 *Note: Turn around time is 18ms (min.) when direction is changed. Figure 5-2.
  • Page 25 Figure 5-3. Write initiate timing Motor on 500ms min. Drive select 500ms min. Write gate Write data 8ms max. 8ms max. Step 18ms min. 1.1ms* min. 590ms** min. Side select 1.1ms* min. 590ms** min. 100ms min. 1.1ms min.* 500ms min. 590ms min.** Drive mode * For MINI - mode...
  • Page 26 Figure 5-5. Power on 700ms min. (auto recalibrate) Motor on Drive select 1ms min. 1ms min. Mode select 100ms max. 100ms max. 100ms max. Mini Mini Maxi mode mode mode Drive select 500ms 500ms max. max. 500ms 500ms max. max. Motor up to speed 360 r.p.m.

  • Page 27: Physical Specification

    Figure 5-6. General control and data timing 700ms min. (auto recalibrate) Power on Motor on Drive select Valid TRK0 WT-PROT output 2ms max. X 18ms min. Valid index 500ms 2ms max. max. 1ms min. Direction select X 18ms min. min. min.
  • Page 28 Figure 6-1. Interface connector locations Frame ground Drive PCB Frame connector P2 connector P1 connector J1 Connector (signal) Connection to J1 is through a 34 pin PCB edge connector. The dimensions for this connector are shown below. The pins are numbered 1 through 34 with the even- numbered pins containing the control and data signals and the odd pins being ground.
  • Page 29 J2 Connector (power) power connector (J2) is located in the rear of the drive. Figure 6-3. J2 Connector pin assignments +12V Return +12V Return Frame grounding WARNING: The drive must be frame-grounded to the host system to ensure proper operation. If the frame of the drive is not fastened directly to the frame of the host system with a good ground, a wire from the system ground must be connected to the drive.
  • Page 30 Figure 6-4. Mechanical dimensions 21.5 32.6 41.5 ±0.5 Front plate dimension 149.4 ±0.5 10 ±0.5 Front plate dimension 12.4 47.4 ±0.5 max. 79.2 ±0.5 4-M3 Through Frame max. 42 13.5 45.59 ground Interface 146 ±0.5 connector 83.75 Dimension to the PCB pattern surface 30.1 ±0.7 Power connections...

  • Page 31: Error Recovery

    If a seek error is detected, the host system should issue a recalibrate operation (step out until the Track 00 line goes active) and seek back to the original track. RS Components Issued September 1994 9419...