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FDC37C669FR

Super I/O Floppy Disk Controller with Fast Infrared Support

SMSC -> Microchip 

QFP

PIN

NO.

18

NAME

DRVDEN1

88

89

78

79

81,91

Receive

Data 2

Transmit

Data 2

Receive

Data 1

Transmit

Data 1

nRequest to

Send

(System

Option)

83,93 nData

Terminal

Ready

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

DRVDEN 1

BUFFER

TYPE

OD48

DESCRIPTION

Indicates the drive and media selected.

Refer to configuration registers CR03,

CR0B, CR1F.

SERIAL PORT INTERFACE

RXD2/IRRX

I

Receiver serial data input for port 2. IR

Receive Data

TXD2/IRTX

O24 Transmit serial data output for port 2. IR

transmit data.

RXD1

I

Reciever serial data input for port 1.

TXD1

024

Transmit serial data output for port 1.

nRTS1

nRTS2

(SYSOPT)

nDTR1

nDTR2

O4

Active low Request to Send outputs for

the Serial Port. Handshake output signal

notifies modem that the UART is ready

to transmit data. This signal can be

programmed by writing to bit 1 of

Modem Control Register (MCR). The

hardware reset will reset the nRTS signal

to inactive mode (high). Forced inactive

during loop mode operation.

At the trailing edge of hardware reset,

the nRTS2 input is latched to determine

the configuration base address:

0 : INDEX Base I/O Address = 3F0 Hex

1 : INDEX Base I/O Address = 370 Hex

O4

Active low Data Terminal Ready outputs

for the serial port. Handshake output

signal notifies modem that the UART is

ready to establish data communication

link. This signal can be programmed by

writing to bit 0 of Modem Control

Register (MCR). The hardware reset will

reset the nDTR signal to inactive mode

(high). Forced inactive during loop mode

operation.

9

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