W83977TF
5.3.5 CFIFO (PARALLEL PORT DATA FIFO) MODE = 010...........................................................58
5.3.6 ECPDFIFO (ECP DATA FIFO) MODE = 011............................................................................58
5.3.7 TFIFO (TEST FIFO MODE) MODE = 110 .................................................................................58
5.3.8 CNFGA (CONFIGURATION REGISTER A) MODE = 111 ....................................................58
5.3.9 CNFGB (CONFIGURATION REGISTER B) MODE = 111.....................................................58
5.3.10 ECR (EXTENDED CONTROL REGISTER) MODE = ALL....................................................59
5.3.11 BIT MAP OF ECP PORT REGISTERS .......................................................................................60
5.3.12 ECP PIN DESCRIPTIONS ............................................................................................................61
5.3.13 ECP OPERATION..........................................................................................................................62
5.3.14 FIFO OPERATION ........................................................................................................................62
5.3.15 DMA TRANSFERS........................................................................................................................63
5.3.16 PROGRAMMED I/O (NON-DMA) MODE................................................................................63
5.4
5.5
EXTENSION FDD MODE (EXTFDD)...................................................................................................63
EXTENSION 2FDD MODE (EXT2FDD) ..............................................................................................63
6. KEYBOARD CONTROLLER .............................................................................................64
6.1
6.2
6.3
6.4
6.5
OUTPUT BUFFER ....................................................................................................................................64
INPUT BUFFER .........................................................................................................................................64
STATUS REGISTER .................................................................................................................................65
COMMANDS .............................................................................................................................................65
HARDWARE GATEA20/KEYBOARD RESET CONTROL LOGIC .................................................67
6.5.1 KB CONTROL REGISTER (LOGIC DEVICE 5, CR-F0) .........................................................67
6.5.2 PORT 92 CONTROL REGISTER (DEFAULT VALUE = 0X24) ............................................67
6.4
ONNOW / SECURITY KEYBOARD AND MOUSE WAKE-UP ......................................................68
7. GENERAL PURPOSE I/O....................................................................................................69
7.1
7.2
BASIC I/O FUNCTIONS...........................................................................................................................71
ALTERNATE I/O FUNCTIONS ..............................................................................................................73
7.2.1 INTERRUPT STEERING..............................................................................................................73
7.2.2 WATCH DOG TIMER OUTPUT .................................................................................................74
7.2.3 POWER LED...................................................................................................................................74
7.2.4 GENERAL PURPOSE ADDRESS DECODER..........................................................................74
7.2.5 GENERAL PURPOSE WRITE STROBE....................................................................................74
8. PLUG AND PLAY CONFIGURATION ............................................................................ 75
8.1
COMPATIBLE PNP...................................................................................................................................75
8.1.1 EXTENDED FUNCTION REGISTERS......................................................................................75
- III -
Publication Release Date: March 1998
Revision 0.62
WINBOND [ WINBOND ]
