FDC37C669_07 SMSC [SMSC Corporation], FDC37C669_07 Datasheet - Page 7

• Manufacturer Part Number: FDC37C669_07
• Description: PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support
• Manufacturer: SMSC [SMSC Corporation]

PIN NO.
37-40,
TQFP
QFP/
19,
27
57
16
10
11
9
Interrupt
Request
A, C, D,
E, F,
Chip Select Input nCS
Reset
nRead Disk Data nRDATA
nWrite
Gate
nWrite
Data
nHead
Select
NAME
DESCRIPTION OF PIN FUNCTIONS
IRQ_A
IRQ_C
IRQ_D
IRQ_E
IRQ_F
RESET
nWGATE
nWDATA
nHDSEL
SYMBOL
FLOPPY DISK INTERFACE
BUFFER
TYPE
OD24
OD48
OD48
OD48
O24
IS
IS
I
7
The interrupt request from the logical device
or IRQIN is output on one of the IRQA-G
signals. Refer to the configuration registers
for more information.
If EPP or ECP Mode is enabled, this output
is pulsed low, then released to allow sharing
of interrupts.
When enabled, this active low pin serves as
an input for an external decoder circuit
which is used to qualify address lines above
This active high signal resets the chip and
must be valid for 500 ns minimum.
effect on the internal registers is described
in
configuration registers are not affected by
this reset.
Raw serial bit stream from the disk drive,
low active. Each falling edge represents a
flux transition of the encoded data.
This active low high current driver allows
current to flow through the write head. It
becomes active just prior to writing to the
diskette.
This active low high current driver provides
the encoded data to the disk drive. Each
falling edge causes a flux transition on the
media.
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.
A10.
the
appropriate
DESCRIPTION
section.
The
The