W83697HF
1.2 FDC Interface, continued
SYMBOL
PIN
I/O
OD
FUNCTION
HEAD#
15
Head select. This open drain output determines which disk drive
head is active.
24
Logic 1 = side 0
Logic 0 = side 1
DSKCHG#
16
IN
cs
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 KW resistor. The resistor can be disabled by bit 7
of L0-CRF0 (FIPURDWN).
1.3 Multi-Mode Parallel Port
The following pins have alternate functions, which are controlled by CR28 and L3-CRF0.
SYMBOL
SLCT
PIN
I/O
IN
FUNCTION
29
PRINTER MODE:
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
OD
EXTENSION FDD MODE: WE2#
12
This pin is for Extension FDD B; its function is the same as the
pin of FDC.
WE#
EXTENSION 2FDD MODE: WE2#
12
This pin is for Extension FDD A and B; its function is the same as
the
pin of FDC.
WE#
PE
30
IN
PRINTER MODE:
t
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
OD
EXTENSION FDD MODE: WD2#
12
This pin is for Extension FDD B; its function is the same as the
pin of FDC.
WD#
EXTENSION 2FDD MODE: WD2#
12
This pin is for Extension FDD A and B; its function is the same as
the
pin of FDC.
WD#
Publication Release Date:Feb. 2002
Revision 0.70
- 8 -
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