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FDC37C669FR

Super I/O Floppy Disk Controller with Fast Infrared Support

SMSC -> Microchip 

QFP

PIN

NO.

63-66

68-71

NAME

Port Data

100 IOCHRDY

24 nIDE Enable

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

PD0-PD7

BUFFER

TYPE

I/O24

DESCRIPTION

The bi-directional parallel data bus is

used to transfer information between

CPU and peripherals.

IOCHRDY

OD24P

In EPP mode, this pin is pulled low to

extend the read/write command. This pin

has an internal pull-up.

nIDEEN

IDE/ALT IR PINS

O24P This active low signal is active when the

(Note 1) IDE is enabled and the I/O address is

accessing an IDE register.

Interrupt

Request H

IRQ_H

024

The interrupt request from a logical

device or IRQIN may be output on the

IRQH signal. Refer to the configuration

registers for more information.

OD24

If EPP or ECP Mode is enabled, this

output is pulsed low, then released to

allow sharing of interrupts.

25 nIDE Chip

Select 0

IRRX2

nHDCS0

IRRX2

O24P

(Note 1)

I

This is the Hard Disk Chip select

corresponding to the eight control block

addresses.

Alternate IR Receive input

26 nIDE Chip

Select 1

nHDCS1

IR Transmit 2 IRTX2

O24P

(Note 1)

O24P

This is the Hard Disk Chip select

corresponding to the alternate status

register.

Alternate IR transmit output

MISCELLANEOUS

20 CLOCK 14 CLK14

ICLK

The external connection to a single

source 14.318 MHz clock.

13

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