W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 4

• Manufacturer Part Number: W83977AF
• Description: W83877TF Plus Kbc, Cir, RTC
• Manufacturer: Information Storage Devices, Inc

1. PIN DESCRIPTION........................................................................................................6
1.1 HOST INTERFACE....................................................................................................................................6
1.2 ADVANCED POWER MANAGEMENT....................................................................................................8
1.3 SERIAL PORT INTERFACE......................................................................................................................9
1.4 INFRARED INTERFACE.........................................................................................................................10
1.5 MULTI-MODE PARALLEL PORT ..........................................................................................................11
1.6 FDC INTERFACE ....................................................................................................................................16
1.7 KBC INTERFACE....................................................................................................................................17
1.8 RTC INTERFACE ....................................................................................................................................17
1.9 POWER PINS ...........................................................................................................................................17
2. FDC FUNCTIONAL DESCRIPTION...........................................................................18
2.1 W83977F/ AF FDC ...................................................................................................................................18
2.2 REGISTER DESCRIPTIONS....................................................................................................................31
2.1.1 AT interface........................................................................................................................................18
2.1.2 FIFO (Data) .......................................................................................................................................18
2.1.3 Data Separator...................................................................................................................................19
2.1.4 Write Precompensation.......................................................................................................................19
2.1.5 Perpendicular Recording Mode ..........................................................................................................19
2.1.6 FDC Core...........................................................................................................................................20
2.1.7 FDC Commands .................................................................................................................................20
2.2.1 Status Register A (SA Register) (Read base address + 0) ....................................................................31
2.2.2 Status Register B (SB Register) (Read base address + 1) ....................................................................33
2.2.3 Digital Output Register (DO Register) (Write base address + 2).........................................................35
2.2.4 Tape Drive Register (TD Register) (Read base address + 3) ...............................................................35
2.2.5 Main Status Register (MS Register) (Read base address + 4)..............................................................36
2.2.6 Data Rate Register (DR Register) (Write base address + 4)................................................................36
2.2.7 FIFO Register (R/W base address + 5) ...............................................................................................38
2.2.8 Digital Input Register (DI Register) (Read base address + 7) .............................................................40
TABLE OF CONTENTS
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W83977F/ W83977AF
Publication Release Date:March 1998
Preliminary Revision 0.58
PRELIMINARY