
W83977TF
PRELIMINARY
Publication Release Date: April 1998
-10-
Revision 0.62
1.5 Multi-Mode Parallel Port, continued
SYMBOL
PIN
I/O
FUNCTION
BUSY
21
IN
t
OD
12
OD
12
PRINTER MODE: BUSY
An active high input indicates that the printer is not ready to receive
data. This pin is pulled high internally. Refer to description of the
parallel port for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: MOB2
This pin is for Extension FDD B; the function of this pin is the same
as the
MOB
pin of FDC.
EXTENSION 2FDD MODE:
MOB2
This pin is for Extension FDD A and B; the function of this pin is the
same as the MOB pin of FDC.
ACK
22
IN
t
OD
12
OD
12
PRINTER MODE: ACK
An active low input on this pin indicates that the printer has
received data and is ready to accept more data. This pin is pulled
high internally. Refer to description of the parallel port for
definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: DSB2
This pin is for the Extension FDD B; its functions is the same as the
DSB pin of FDC.
EXTENSION 2FDD MODE: DSB2
This pin is for Extension FDD A and B; it functions is the same as
the DSB pin of FDC.
ERR
34
IN
t
OD
12
OD
12
PRINTER MODE:
ERR
An active low input on this pin indicates that the printer has
encountered an error condition. This pin is pulled high internally.
Refer to description of the parallel port for definition of this pin in
ECP and EPP mode.
EXTENSION FDD MODE: HEAD2
This pin is for Extension FDD B; its function is the same as the
HEADpin of FDC.
EXTENSION 2FDD MODE: HEAD2
This pin is for Extension FDD A and B; its function is the same as
the
HEAD
pin of FDC.