
W83977TF
Publication Release Date: March 1998
- I -
Revision 0.62
TABLE OF CONTENTS
GENERAL DESCRIPTION.......................................................................................................1
FEATURES....................................................................................................................................2
PIN CONFIGURATION .............................................................................................................4
1. PIN DESCRIPTION................................................................................................................5
1.1
HOST INTERFACE.....................................................................................................................................5
1.2
GENERAL PURPOSE I/O PORT...............................................................................................................7
1.3
SERIAL PORT INTERFACE......................................................................................................................8
1.4
INFRARED INTERFACE...........................................................................................................................9
1.5
MULTI-MODE PARALLEL PORT...........................................................................................................9
1.6
FDC INTERFACE......................................................................................................................................14
1.7
KBC INTERFACE......................................................................................................................................15
1.8
POWER PINS.............................................................................................................................................16
1.9
ACPI INTERFACE.....................................................................................................................................16
2. FDC FUNCTIONAL DESCRIPTION................................................................................17
2.1
W83977TF FDC .........................................................................................................................................17
2.1.1 AT INTERFACE.............................................................................................................................17
2.1.2 FIFO (DATA)..................................................................................................................................17
2.1.3 DATA SEPARATOR.....................................................................................................................18
2.1.4 WRITE PRECOMPENSATION...................................................................................................18
2.1.5 PERPENDICULAR RECORDING MODE.................................................................................18
2.1.6 FDC CORE......................................................................................................................................19
2.1.7 FDC COMMANDS........................................................................................................................19
2.2
REGISTER DESCRIPTIONS ...................................................................................................................29
2.2.1 STATUS REGISTER A (SA REGISTER) (READ BASE ADDRESS + 0).............................29
2.2.2 STATUS REGISTER B (SB REGISTER) (READ BASE ADDRESS + 1).............................31
2.2.3 DIGITAL OUTPUT REGISTER (DO REGISTER) (WRITE BASE ADDRESS + 2)............33
2.2.4 TAPE DRIVE REGISTER (TD REGISTER) (READ BASE ADDRESS + 3)........................33
2.2.5 MAIN STATUS REGISTER (MS REGISTER) (READ BASE ADDRESS + 4)....................34