W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 59

• Manufacturer Part Number: W83877
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

5.3.1 ECP Register and Mode Definitions
Note: The base addresses are specified by CR23, which are determined by configuration register or hardware setting.
Note: The mode selection bits are bit 7-5 of the Extended Control Register.
5.3.2 Data and ecpAFifo Port
Modes 000 (SPP) and 001 (PS/2) (Data Port)
During a wite operation, the Data Register latches the contents of the data bus on the rising edge of
the input. The contents of this register are output to the PD0-PD7 ports. During a read operation,
ports PD0-PD7 are read and output to the host. The bit definitions are as follows:
MODE
000
001
010
011
100
101
110
111
data
ecpAFifo
dsr
dcr
cFifo
ecpDFifo
tFifo
cnfgA
cnfgB
ecr
NAME
SPP mode
PS/2 Parallel Port mode
Parallel Port Data FIFO mode
ECP Parallel Port mode
EPP mode (If this option is enabled in the CR9 and CR0 to select ECP/EPP mode)
Reserved
Test mode
Configuration mode
Base+000h
Base+000h
Base+001h
Base+002h
Base+400h
Base+400h
Base+400h
Base+400h
Base+401h
Base+402h
ADDRESS
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
I/O
R
R
- 59 -
ECP MODES
DESCRIPTION
000-001
011
010
011
110
111
111
All
All
All
Publication Release Date: January 1996
Data Register
ECP FIFO (Address)
Status Register
Control Register
Parallel Port Data FIFO
ECP FIFO (DATA)
Test FIFO
Configuration Register A
Configuration Register B
Extended Control Register
FUNCTION
W83877F
Revision A2