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FDC37C669-MS

PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support

SMSC -> Microchip 

QFP/

TQFP

PIN NO.

NAME

81,91 nRequest to

Send

(System Option)

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

nRTS1

nRTS2

(SYSOPT)

BUFFER

TYPE

DESCRIPTION

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

83,93 nData Terminal

Ready

nDTR1

nDTR2

82,92 nClear to Send nCTS1

nCTS2

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.

I

Active low Clear to Send inputs for the serial

port. Handshake signal which notifies the

UART that the modem is ready to receive

data. The CPU can monitor the status of

nCTS signal by reading bit 4 of Modem Status

Register (MSR). A nCTS signal state change

from low to high after the last MSR read will

set MSR bit 0 to a 1. If bit 3 of Interrupt

Enable Register is set, the interrupt is

generated when nCTS changes state. The

nCTS signal has no effect on the transmitter.

Note: Bit 4 of MSR is the complement of

nCTS.

9

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