w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 48

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

5.4 EXTENSION FDD MODE (EXTFDD)....................................................................................................98
5.5 EXTENSION 2FDD MODE (EXT2FDD) ................................................................................................98
6.0 KEYBOARD CONTROLLER ...................................................................................99
6.1 OUTPUT BUFFER...................................................................................................................................99
6.2 INPUT BUFFER ......................................................................................................................................99
6.3 STATUS REGISTER .............................................................................................................................100
6.4 COMMANDS ........................................................................................................................................100
6.5 HARDWARE GATEA20/KEYBOARD RESET CONTROL LOGIC .....................................................102
7.0 GENERAL PURPOSE I/O........................................................................................104
7.1 BASIC I/O FUNCTIONS .......................................................................................................................106
7.2 ALTERNATE I/O FUNCTIONS............................................................................................................108
8.0 PLUG AND PLAY CONFIGURATION ..................................................................110
8.1 COMPATIBLE PNP ..............................................................................................................................110
8.2 CONFIGURATION SEQUENCE...........................................................................................................111
9.0 ACPI REGISTERS FEATURES ..............................................................................113
9.1 SMI TO SCI/SCI TO SMI AND BUS MASTER ....................................................................................114
9.2 POWER MANAGEMENT TIMER ........................................................................................................115
9.3 ACPI REGISTERS (ACPIRS)................................................................................................................116
5.3.16 Programmed I/O (NON-DMA) Mode ...............................................................................................98
6.5.1 KB Control Register (Logic Device 5, CR-F0) .................................................................................102
6.5.2 Port 92 Control Register (Default Value = 0x24).............................................................................103
7.2.1 Interrupt Steering ............................................................................................................................108
7.2.2 Watch Dog Timer Output.................................................................................................................109
7.2.3 Power LED......................................................................................................................................109
7.2.4 General Purpose Address Decoder ..................................................................................................109
7.2.5 General Purpose Write Strobe .........................................................................................................109
8.1.1 Extended Function Registers ...........................................................................................................110
8.1.2 Extended Functions Enable Registers (EFERs)................................................................................111
8.1.3 Extended Function Index Registers (EFIRs), Extended Function Data Registers(EFDRs) ................111
9.3.1 Power Management 1 Status Register 1 (PM1STS1).........................................................................116
9.3.2 Power Management 1 Status Register 2 (PM1STS2).........................................................................117
9.3.3 Power Management 1 Enable Register 1(PM1EN1) .........................................................................118
9.3.4 Power Management 1 Enable Register 2 (PM1EN2) ........................................................................118
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Publication Release Date:April 1998
W83977ATF
PRELIMINARY
Revision 0.52