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FDC37C666GT Arkusz danych(PDF) 7 Page - SMSC Corporation

Numer części FDC37C666GT
Szczegółowy opis  High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers
Download  152 Pages
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Producent  SMSC [SMSC Corporation]
Strona internetowa  http://www.smsc.com
Logo SMSC - SMSC Corporation

FDC37C666GT Arkusz danych(HTML) 7 Page - SMSC Corporation

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DESCRIPTION OF PIN FUNCTIONS
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
39
Parallel Port
Interrupt
Request 1
PINTR1
O24
OD24
This interrupt from the Parallel Port is
enabled/disabled via bit 4 of the Parallel
Port
Control
Register.
Refer
to
configuration registers CR1 and CR3 for
more information.
If EPP or ECP Mode is enabled, this output
is pulsed low, then released to allow sharing
of interrupts.
57
Reset
RST
IS
This
active
high
signal
resets
the
FDC37C665GT and must be valid for 500
ns minimum.
The effect on the internal
registers is described in the appropriate
section. The configuration registers are not
affected
by
this
reset.
In
the
FDC37C666GT, the falling edge of reset
latches the jumper configuration.
The
jumper select lines must be valid 50 ns prior
to this edge.
FLOPPY DISK INTERFACE
16
nRead Disk Data nRDATA
IS
Raw serial bit stream from the disk drive,
low active. Each falling edge represents a
flux transition of the encoded data.
10
nWrite
Gate
nWGATE
OD48
This active low high current driver allows
current to flow through the write head.
It
becomes active just prior to writing to the
diskette.
9
nWrite
Data
nWDATA
OD48
This active low high current driver provides
the encoded data to the disk drive.
Each
falling edge causes a flux transition on the
media.
11
nHead
Select
nHDSEL
OD48
This high current output selects the floppy
disk side for reading or writing. A logic "1"
on this pin means side 0 will be accessed,
while a logic "0" means side 1 will be ac-
cessed.


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