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W83977CTF

WINBOND I/O

Winbond 

W83977EF/ CTF

PRELIMINARY

5.3.11 Bit Map of ECP Port Registers ........................................................................................... 74

5.3.12 ECP Pin Descriptions....................................................................................................... 75

5.3.13 ECP Operation................................................................................................................. 76

5.3.14 FIFO Operation................................................................................................................. 76

5.3.15 DMA Transfers................................................................................................................. 77

5.3.16 Programmed I/O (NON-DMA) Mode.................................................................................. 77

5.4 EXTENSION FDD MODE (EXTFDD) ........................................................................................ 77

5.5 EXTENSION 2FDD MODE (EXT2FDD) .................................................................................... 77

6.0 KEYBOARD CONTROLLER ..............................................................................78

6.1 OUTPUT BUFFER .................................................................................................................... 78

6.2 INPUT BUFFER........................................................................................................................ 78

6.3 STATUS REGISTER................................................................................................................. 79

6.4 COMMANDS.............................................................................................................................. 80

6.5 HARDWARE GATEA20/KEYBOARD RESET CONTROL LOGIC ............................................ 81

6.5.1 KB Control Register (Logic Device 5, CR-F0)....................................................................... 82

6.5.2 Port 92 Control Register (Default Value = 0x24)................................................................... 82

6.6 ONNOW / SECURITY KEYBOARD AND MOUSE WAKE-UP.................................................... 83

6.6.1 Keyboard Wake-Up Function ............................................................................................... 83

6.6.2 Keyboard Password Wake-Up Function .............................................................................. 83

6.6.3 Mouse Wake-Up Function.................................................................................................... 83

7.0 GENERAL PURPOSE I/O...................................................................................84

7.1 BASIC I/O FUNCTIONS............................................................................................................. 86

7.2 ALTERNATE I/O FUNCTIONS................................................................................................... 88

7.2.1 Interrupt Steering ................................................................................................................. 88

7.2.2 Watch Dog Timer Output ..................................................................................................... 89

7.2.3 Power LED .......................................................................................................................... 89

7.2.4 General Purpose Address Decoder...................................................................................... 89

8.0 PLUG AND PLAY CONFIGURATION ................................................................90

Publication Release Date: March 1999

-IV -

Revision A1

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