w83977eg Winbond Electronics Corp America, w83977eg Datasheet - Page 4

• Manufacturer Part Number: w83977eg
• Description: Winbond Isa I/o W83977ef W83977eg
• Manufacturer: Winbond Electronics Corp America

7.
8.
PARALLEL PORT .................................................................................................................... 53
7.1
7.2
7.3
7.4
7.5
KEYBOARD CONTROLLER .................................................................................................... 68
8.1
8.2
8.3
8.4
8.5
6.2.6
6.2.7
6.2.8
6.2.9
Printer Interface Logic................................................................................................... 53
Enhanced Parallel Port (EPP) ...................................................................................... 54
7.2.1
7.2.2
7.2.3
7.2.4
7.2.5
7.2.6
7.2.7
7.2.8
Extended Capabilities Parallel (ECP) Port ................................................................... 59
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
7.3.6
7.3.7
7.3.8
7.3.9
7.3.10
7.3.11
7.3.12
7.3.13
7.3.14
7.3.15
7.3.16
Extension FDD Mode (EXTFDD).................................................................................. 67
Extension 2FDD Mode (EXT2FDD).............................................................................. 67
Output Buffer................................................................................................................. 68
Input Buffer ................................................................................................................... 68
Status Register ............................................................................................................. 69
Commands.................................................................................................................... 70
Hardware GATEA20/Keyboard Reset Control Logic................................................... 71
8.5.1
8.5.2
Interrupt Status Register (ISR) (Read only) ..................................................................50
Interrupt Control Register (ICR) (Read/Write) ..............................................................51
Programmable Baud Generator (BLL/BHL) (Read/Write).............................................51
User-defined Register (UDR) (Read/Write) ..................................................................52
Data Swapper...............................................................................................................55
Printer Status Buffer .....................................................................................................55
Printer Control Latch and Printer Control Swapper.......................................................56
EPP Address Port ........................................................................................................56
EPP Data Port 0-3 ........................................................................................................57
Bit Map of Parallel Port and EPP Registers..................................................................57
EPP Pin Descriptions ...................................................................................................58
EPP Operation .............................................................................................................58
ECP Register and Mode Definitions .............................................................................59
Data and ecpAFifo Port ................................................................................................60
Device Status Register (DSR) ......................................................................................60
Device Control Register (DCR).....................................................................................61
CFIFO (Parallel Port Data FIFO) Mode = 010 ..............................................................62
ECPDFIFO (ECP Data FIFO) Mode = 011...................................................................62
TFIFO (Test FIFO Mode) Mode = 110..........................................................................62
CNFGA (Configuration Register A) Mode = 111...........................................................62
CNFGB (Configuration Register B) Mode = 111...........................................................62
ECR (Extended Control Register) Mode = all ...............................................................63
Bit Map of ECP Port Registers .....................................................................................64
ECP Pin Descriptions ...................................................................................................65
ECP Operation .............................................................................................................66
FIFO Operation ............................................................................................................66
DMA Transfers .............................................................................................................67
Programmed I/O (NON-DMA) Mode.............................................................................67
KB Control Register (Logic Device 5, CR-F0)...............................................................71
Port 92 Control Register (Default Value = 0x24) ..........................................................72
W83977EF-AW/W83977EG-AW
-III-
Publication Release Date: Apr. 2006
Revision 1.2