
W83977F/ W83977AF
PRELIMINARY
Publication Release Date: March 1998
-14-
Revision 0.58
1.5 Multi-Mode Parallel Port, continued
SYMBOL
PIN
I/O
FUNCTION
PD1
30
I/O
24t
PRINTER MODE: PD1
Parallel port data bus bit 1. Refer to description of the parallel
port for definition of this pin in ECP and EPP mode. .
IN
t
EXTENSION FDD MODE: TRAK02
This pin is for Extension FDD B; the function of this pin is the
same as the TRAK0 pin of FDC. It is pulled high internally..
IN
t
EXTENSION. 2FDD MODE: TRAK02
This pin is for Extension FDD A and B; the function of this pin is
the same as the TRAK0 pin of FDC. It is pulled high internally.
PD2
29
I/O
24t
PRINTER MODE: PD2
Parallel port data bus bit 2. Refer to description of the parallel
port for definition of this pin in ECP and EPP mode..
IN
t
EXTENSION FDD MODE: WP2
This pin is for Extension FDD B; the function of this pin is the
same as the
WP
pin of FDC. It is pulled high internally.
IN
t
EXTENSION. 2FDD MODE: WP2
This pin is for Extension FDD A and B; the function of this pin 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 description of the parallel
port for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: RDATA2
This pin is for Extension FDD B; the function of this pin 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; this function of this pin is
the same as the RDATA pin of FDC. It is pulled high internally.
PD3
28
I/O
24t
IN
t
IN
t