FDC87W22 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
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FDC87W22 Datasheet PDF : 140 Pages
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IDE and FDC Interface
SYMBOL
PIN
nRESIDE/
1
IRQ_G
nIDBEN/
91
IRQ_H
nCS1/
95
IRTX2
nCS0/
94
IRRX2
nWE
85
nDIR
89
nHEAD
88
nRWC
87
nWD
86
nSTEP
82
I/O
OUT12t
OUT12t
OUT12t
OUT12t
OUT12t
OUT12t
OUT12t
INt
OD24
OD24
OD24
OD24
OD24
OD24
FUNCTION
When CR16 Bit 1 (IRIDE) = 0: Active low reset signal for
IDE;
When CR16 Bit 1 (IRIDE) = 1: Interrupt request signal G.
When CR16 Bit 1 (IRIDE) = 0: Active low enable signal for
IDE;
When CR16 Bit 1 (IRIDE) = 1: Interrupt request signal H.
When CR16 Bit 1 (IRIDE) = 0: This pin is used to select the
IDE
controller. nCS1 decodes the HDC addresses specified in
CR22.
When CR16 Bit 1 (IRIDE) = 1: Function as a InfraRed
transmission data line.
When CR16 Bit 1 (IRIDE) = 0: This pin is used to select the
IDE
controller. nCS0 decodes HDC addresses specified in
CR21.
When CR16 Bit 1 (IRIDE) = 1: Function as a InfraRed
receiving line.
Write enable. An open drain output.
Direction of the head step motor. An open drain output.
Logic 1 = outward motion
Logic 0 = inward motion
Head select. This open drain output determines which disk
drive head is active.
Logic 1 = side 0
Logic 0 = side 1
Reduced write current. This signal can be used on two-
speed disk drives to select the transfer rate. An open drain
output.
Logic 0 = 250 Kb/s
Logic 1 = 500 Kb/s
When bit 5 of CR9 (EN3MODE) is set to high, the three-
mode FDD function is enabled, and the pin will have a
different definition. Refer to the EN3MODE bit in CR9.
Write data. This logic low open drain writes
precompensation serial data to the selected FDD. An open
drain output.
Step output pulses. This active low open drain output
produces a pulse to move the head to another track.
18
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