W83627HF/ F/ HG/ G
FDC Interface, continued.
SYMBOL
PIN
I/O
FUNCTION
RDATA#
15
16
INcsu
The read data input signal from the FDD. This input pin is
pulled up internally by a 1 K ohm resistor. The resistor can be
disabled by bit 7 of L0-CRF0 （FIPURDWN）.
HEAD#
OD24
INcsu
Head select. This open drain output determines which disk
drive head is active.
Logic 1 = side 0
Logic 0 = side 1
DSKCHG#
17
Diskette change. This signal is active low at power on and
whenever the diskette is removed. This input pin is pulled up in-
ternally by a 1 K ohm resistor. The resistor can be disabled by
bit 7 of L0-CRF0 （FIPURDWN）.
6.3
Multi-Mode Parallel Port
The following pins have alternate functions (Printer Mode and Extension FDD Mode), which are se-
lected by CR28 and LD1-CRF0 setting.
SYMBOL
PIN
I/O
FUNCTION
SLCT
31
INts
PRINTER MODE：
An active high input on this pin indicates that the printer is se-
lected. Refer to the description of the parallel port for defini-
tion of this pin in ECP and EPP mode.
WE2#
OD12
EXTENSION FDD MODE：
This pin is for Extension FDD B; its function is the same as
the
pin of FDC.
WE#
EXTENSION 2FDD MODE：
This pin is for Extension FDD A and B; its function is the
same as the
pin of FDC.
WE#
PE
32
INts
PRINTER MODE：
An active high input on this pin indicates that the printer has
detected the end of the paper. Refer to the description of the
parallel port for the definition of this pin in ECP and EPP
mode.
WD2#
OD12
EXTENSION FDD MODE：
This pin is for Extension FDD B; its function is the same as
the
pin of FDC.
WD#
EXTENSION 2FDD MODE：
This pin is for Extension FDD A and B; its function is the
same as the
pin of FDC.
WD#
Publication Release Date: June 09, 2006
Revision 2.27
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