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FDC37C669-MT View Datasheet(PDF) - SMSC -> Microchip

Part NameDescriptionManufacturer
FDC37C669-MT PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support SMSC
SMSC -> Microchip SMSC
FDC37C669-MT Datasheet PDF : 162 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
DESCRIPTION OF PIN FUNCTIONS
QFP/
TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
19,
37-40,
Interrupt Request IRQ_A
A, C, D,
IRQ_C
E, F,
IRQ_D
IRQ_E
O24 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.
IRQ_F
OD24
If EPP or ECP Mode is enabled, this output is
pulsed low, then released to allow sharing of
interrupts.
27 Chip Select Input nCS
I
When enabled, this active low pin serves as
an input for an external decoder circuit which
is used to qualify address lines above A10.
57 Reset
RESET
IS This active high signal resets the chip 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.
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 accessed.
7 Direction
Control
nDIR
OD48
This high current low active output determines
the direction of the head movement. A logic
"1" on this pin means outward motion, while a
logic "0" means inward motion.
7
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