
W83977ATF
PRELIMINARY
Publication Release Date: April 1998
-14-
Revision 0.52
1.5 Multi-Mode Parallel Port, continued
SYMBOL
PIN
I/O
FUNCTION
PD0
31
I/O
24t
PRINTER MODE: PD0
Parallel port data bus bit 0. Refer to the description of the
parallel port for the definition of this pin in ECP and EPP mode.
IN
t
EXTENSION FDD MODE: INDEX2
This pin is for Extension FDD B; its function is the same as the
INDEX pin of FDC. It is pulled high internally.
IN
t
EXTENSION 2FDD MODE: INDEX2
This pin is for Extension FDD A and B; its function is the same
as the INDEX pin of FDC. It is pulled high internally.
PD1
30
I/O
24t
IN
t
IN
t
PRINTER MODE: PD1
Parallel port data bus bit 1. Refer to the description of the
parallel port for the definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: TRAK02
This pin is for Extension FDD B; its function is the same as the
TRAK0 pin of FDC. It is pulled high internally.
EXTENSION. 2FDD MODE: TRAK02
This pin is for Extension FDD A and B; its function is the same
as the TRAK0 pin of FDC. It is pulled high internally.
PD2
29
I/O
24t
IN
t
IN
t
PRINTER MODE: PD2
Parallel port data bus bit 2. Refer to the description of the
parallel port for the definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: WP2
This pin is for Extension FDD B; its function is the same as the
WP
pin of FDC. It is pulled high internally.
EXTENSION. 2FDD MODE: WP2
This pin is for Extension FDD A and B; its function is the same
as the WP pin of FDC. It is pulled high internally.
PRINTER MODE: PD3
Parallel port data bus bit 3. Refer to the description of the
parallel port for the definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: RDATA2
This pin is for Extension FDD B; its function is the same as the
RDATA pin of FDC. It is pulled high internally.
EXTENSION 2FDD MODE: RDATA2
This pin is for Extension FDD A and B; its function is the same
as the RDATA pin of FDC. It is pulled high internally.
PD3
28
I/O
24t
IN
t
IN
t