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GM82C765B Datasheet(PDF) 4 Page - Hynix Semiconductor |
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GM82C765B Datasheet(HTML) 4 Page - Hynix Semiconductor |
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4 / 36 page  GM82C765B 4 22 24 DRV DRIVE TYPE I ST Drive type input indicates to the device that a two-speed spindle motor is used if logic is O. In that case, the second clock input will never be selected and must be grounded. 25 1 XI 1 XTAL O ST XTAL oscillator drive output for 44 pin PLCC should be left floating if TTL inputs used at pin 26. 26 XT1 XTAL1 I N XTAL oscillator input requiring 16MHz crystal. This oscillator is used for all standard data rates, and may be driven with a TTL level signal. 23 CLK1 CLOCK1 I N TTL level clock input is used to generate all internal timings for standard data rates. Frequency must be 16MHz ± 0.1%, and may 40/60 or 60/40 duty cycle. * XT1 (PIN 26) of 44-PLCC 24 27 PCVAL PRECOMPEN-SATION VALUE I ST PRECOMPENSATION VALUE select input. This pin determines the amount of write precompensation used on the inner tracks of the diskette. Logic 1 = 125nS, Logic 0 = 187nS 25 28 HS HEAD SELECT O HCD High Current drive (HCD) output selects the head (side) of the floppy disk that is being read or written. Logic 1 = side 0. Logic 0 = side 1. 26 29 WE ENABLE WRITE O HCD This HCD output becomes true, active low, just prior to writing on the diskette. This allows current to flow through the write head. 27 30 WD DATA WRITE O HCD This HCD output DATA WRITE . Each failing edge of the encoded data pulse stream causes a flux transition on the media. 28 31 DIRC DIRECTION O HCD This HCD output determines the direction of the HEAD step motor. Logic 1 = outward motion. Logic 0 = inward motion. 29 32 STEP PULSE STEP CONTROL O HCD This HCD output issues an active low pulse for each track to track movement of the head. 30 33 1 DS 1 SELECT DRIVE O HCD This HCD output, when active low, is 1 SELECT DRIVE in PC AT mode, enables the interface in disk drive. This signal comes from the Operations Register. In Base or Special mode, this output is #1 of the four decoded Unit Selects, as specified in the device command syntax. 31 34 VSS GROUND Ground 32 35 2 DS 2 SELECT DRIVE O HCD This HCD output, when active low, is 2 SELECT DRIVE in PC AT mode, enables the interface in disk drive. This signal comes from the Operations Register. In Base or Special mode, this output is # 2 of the four decoded Unit Selects, as specified in the device command syntax. 33 36 1 MO , 3 DS 1 ON MOTOR 3 SELECT DRIVE O HCD This HCD output, when active low, is MOTOR ON enable for disk drive #1, in PC AT mode. This signal comes from the OPERATIONS Register in the BASE or Special mode, this output is #3 of the four decoded Unit Selects as specified in the device command syntax. |
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Similar Description - GM82C765B |
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