
W83697HF
Publication Release Date:Feb. 2002
Revision 0.70
- 8 -
1.2 FDC Interface, continued
SYMBOL
HEAD#
PIN
15
I/O
OD
24
FUNCTION
Head select. This open drain output determines which disk drive
head is active.
Logic 1 = side 0
Logic 0 = side 1
Diskette change. This signal is active low at power on and
whenever the diskette is removed. This input pin is pulled up
internally by a 1 K
resistor. The resistor can be disabled by bit 7
of L0-CRF0 (FIPURDWN).
DSKCHG#
16
IN
cs
1.3 Multi-Mode Parallel Port
The following pins have alternate functions, which are controlled by CR28 and L3-CRF0.
SYMBOL
PIN
I/O
SLCT
29
IN
t
An active high input on this pin indicates that the printer is
selected. This pin is pulled high internally. Refer to the
description of the parallel port for definition of this pin in ECP and
EPP mode.
OD
12
WE# pin of FDC.
OD
12
the WE# pin of FDC.
PE
An active high input on this pin indicates that the printer has
detected the end of the paper. This pin is pulled high internally.
Refer to the description of the parallel port for the definition of this
pin in ECP and EPP mode.
OD
12
WD# pin of FDC.
This pin is for Extension FDD A and B; its function is the same as
the WD# pin of FDC.
FUNCTION
PRINTER MODE:
EXTENSION FDD MODE: WE2#
This pin is for Extension FDD B; its function is the same as the
EXTENSION 2FDD MODE: WE2#
This pin is for Extension FDD A and B; its function is the same as
30
IN
t
PRINTER MODE:
EXTENSION FDD MODE: WD2#
This pin is for Extension FDD B; its function is the same as the
OD
12
EXTENSION 2FDD MODE: WD2#