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FDC37C665IR

3/5 Volt Advanced High-Performance Multi-Mode™ Parallel Port Super I/O Floppy Disk Controller with Infrared Support

SMSC -> Microchip 

PIN NO.

NAME

38 Serial Port

Interrupt

Request

37 Serial Port

Interrupt

Request

40 Floppy

Controller

Interrupt

Request

39 Parallel Port

Interrupt

Request 1

DESCRIPTION OF PIN FUNCTIONS

BUFFER

SYMBOL TYPE

DESCRIPTION

IRQ4

O12 IRQ4 is the interrupt from the Primary Serial

Port (PSP) or Secondary Serial Port (SSP)

when the PSP or SSP have their address

programmed as COM1 or COM3 (as

defined in the Configuration Registers). The

appropriate interrupt from the Serial Port is

enabled/disabled via the Interrupt Enable

Register (IER). The interrupt is reset

inactive after interrupt service. It is disabled

through IER or hardware reset.

IRQ3

O12 IRQ3 is the interrupt from the Primary Serial

Port (PSP) or secondary Serial Port (SSP)

when the PSP or SSP have their address

programmed as COM2 or COM4 (as

defined in the Configuration Registers). The

appropriate interrupt from the Serial Port is

enabled/disabled via the Interrupt Enable

Register (IER). The interrupt is reset

inactive after interrupt service. It is disabled

through IER or hardware reset.

FINTR

O12 This interrupt from the Floppy Disk

Controller is enabled/disabled via bit 3 of the

Digital Output Register (DOR).

PINTR1

O12 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.

OD12

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

FDC37C665IR 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.

6

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