VT8231 datasheet(26/132 Pages) ETC

26 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-20-

Pinouts

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Serial Port and Infrared Interface

Signal Name

Pin #

I/O

Signal Description

TXD

B15

Transmit Data. Serial port transmit data out.

RXD

E14

Receive Data. Serial port receive data in.

IRTX / GPO14

O / O

Infrared Transmit. IR transmit data out (Rx76[5] = 0) selectable from serial port

1, 2, or 3. General Purpose Output 14 if Rx76[5] = 1

IRRX / GPO15

I / O

Infrared Receive. IR receive data in (Rx76[5] = 0) selectable to serial port 1, 2,

or 3. General Purpose Output 15 if Rx76[5] = 1

IRRX2 / GPI

I / I

Infrared Receive. IR receive data in (Rx76[5] = 0)

RTS#

A15

Request To Send. Indicator that the serial output port is ready to transmit data.

Typically used as hardware handshake with CTS# for low level flow control.

Designed for direct input to external RS-232C driver.

CTS#

B16

Clear To Send.

Indicator to the serial port that an external communications

device is ready to receive data. Typically used as hardware handshake with RTS#

for low level flow control. Designed for input from external RS-232C receiver.

DTR#

A16

Data Terminal Ready.

Indicator that serial port is powered, initialized, and

ready. Typically used as hardware handshake with DSR# for overall readiness to

communicate. Designed for direct input to external RS-232C driver.

DSR#

D14

Data Set Ready. Indicator to serial port that an external serial communications

device is powered, initialized, and ready. Typically used as hardware handshake

with DTR# for overall readiness to communicate. Designed for direct input from

external RS-232C receiver.

DCD#

F14

Data Carrier Detect. Indicator to serial port that an external modem is detecting

a carrier signal (i.e., a communications channel is currently open).

In direct

connect environments, this input will typically be driven by DTR# as part of the

DTR/DSR handshake. Designed for direct input from external RS-232C receiver.

RI#

C16

Ring Indicator. Indicator to serial port that an external modem is detecting a ring

condition.

Used by software to initiate operations to answer and open the

communications channel. Designed for direct input from external RS-232C

receiver (whose input is typically not connected in direct connect environments).

VT8231 Datasheet(PDF) 26 Page - List of Unclassifed Manufacturers

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