FDC37C665IR SMSC Corporation, FDC37C665IR Datasheet - Page 14

• Manufacturer Part Number: FDC37C665IR
• Description: 3/5 Volt Advanced High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controller with Infranred Support
• Manufacturer: SMSC Corporation

PIN NO.
15,72
67,95
6,47,
27
22
58
20
21
98
nI/O 16 Bit
Indicator
IDE Data Bit 7
Power Good
CLOCK 1
CLOCK 2
I/O Power
Power
Ground
NAME
DESCRIPTION OF PIN FUNCTIONS
nIOCS16
nHDACK
IDED7
PWRGD
X1/CLK1
X2/CLK2
V
V
GND
IO
CC
SYMBOL
MISCELLANEOUS
BUFFER
OCLK
TYPE
I/O12
ICLK
I
I
I
14
This input indicates, in AT mode only, when
16 bit transfers are to take place.
signal is generated by the hard disk
interface. Logic "0" = 16 bit mode; logic "1"
= 8 bit mode.
In the XT mode, this is the Hard Disk
Controller DMA Acknowledge, low active.
IDE data bit 7 in the AT mode.
transfers data at I/O addresses 1F0H-1F7H
(R/W), 3F6 (R/W), 3F7(W). IDED7 should
be connected to IDE data bit 7.
FDC37C665IR
transferring data bit 7 between the IDE
device and the host.
3F7H, IDED7 is the FDC disk change bit. In
the XT mode, IDE7 is not used.
FDC37C665IR (Motherboard Mode): This
input indicates that the power (V
active. When PWRGD is inactive, all inputs
to the FDC37C665IR are disconnected and
put in a low power mode, all outputs are put
into high impedance.
registers are preserved as long as V
valid value. The driver current drain in this
mode drops to ISTBY - standby current.
This input has a weak pullup resistor to V
The external connection for a parallel
resonant 24 MHz crystal.
compatible oscillator is required if crystal is
not used.
24 MHz crystal. If an external clock is used,
this pin should not be connected. This pin
should not be used to drive any other
drivers.
I/O Interface supply pin (5 volt)
+3.3 volt supply pin.
Ground pin.
For device operation, PWRGD must be
DESCRIPTION
functions
The contents of all
During I/O read of
as
CC
A CMOS
a
) is valid.
CC
IDED7
buffer
has a
This
The
CC
.