W83977F-A Datasheet, PDF (6/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
8.4 Extension FDD Mode (EXTFDD) .......................................................................................... 95
8.5 Extension 2FDD Mode (EXT2FDD) ...................................................................................... 95
9. REAL-TIME CLOCK (RTC) AND "ON-NOW" CONTROL ............................................................... 96
9.1 REGISTER ADDRESS MAP................................................................................................. 96
9.2 Update Cycle......................................................................................................................... 98
9.3 REGISTERS ......................................................................................................................... 99
9.3.1 Register 0Ah...........................................................................................................................99
9.3.2 Register 0Bh (Read/Write) ...................................................................................................100
9.3.3 Register 0Ch (Read only) .....................................................................................................101
9.3.4 Register D (Read only) .........................................................................................................102
9.4 "On-Now" Control................................................................................................................ 102
9.5 Power-On Events ................................................................................................................ 102
9.6 Power-Off Events ................................................................................................................ 102
9.7 Registers ............................................................................................................................. 103
9.7.1 On-Now”” Register 1 (Bank2 Register 49h) ..........................................................................103
9.7.2 On-Now_ Register 2 (Bank2 Register 4Ah) ..........................................................................104
9.7.3 "On-Now" Register 3 (Bank2 Register 4Bh) .........................................................................105
9.7.4 "On-Now" Register 4 (Bank2 Register 4Ch) .........................................................................106
10. KEYBOARD CONTROLLER ......................................................................................................... 107
10.1 Output Buffer ....................................................................................................................... 108
10.2 Input Buffer.......................................................................................................................... 108
10.3 Status Register.................................................................................................................... 108
10.4 Commands.......................................................................................................................... 109
10.5 HARDWARE GATEA20/KEYBOARD RESET CONTROL LOGIC..................................... 110
10.5.1 KB Control Register (Logic Device 5, CR-F0).......................................................................110
10.5.2 Port 92 Control Register (Default Value = 0x24) ..................................................................111
11. GENERAL PURPOSE I/O ............................................................................................................. 112
11.1 Basic I/O functions .............................................................................................................. 113
11.2 Alternate I/O Functions ....................................................................................................... 115
11.2.1 Interrupt Steering..................................................................................................................115
11.2.2 Watch Dog Timer Output......................................................................................................115
11.2.3 Power LED ...........................................................................................................................116
11.2.4 General Purpose Address Decoder......................................................................................116
11.2.5 General Purpose Write Strobe..............................................................................................116
12. PLUG AND PLAY CONFIGURATION ........................................................................................... 117
12.1 Comply PnP ........................................................................................................................ 117
12.1.1 Wait for Key State.................................................................................................................117
12.1.2 Sleep State...........................................................................................................................118
12.1.3 Isolation State.......................................................................................................................118
12.1.4 Configure State.....................................................................................................................118
12.2 Compatible PnP .................................................................................................................. 118
Publication Release Date: May 2006
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Revision 0.60