XR16C872 Ver la hoja de datos (PDF) - Exar Corporation

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XR16C872

Dual UART with 1284 Parallel Port and Plug-and-Play Controller

Exar Corporation 

XR16C872

Preliminary

To ISA Bus

D0-D7

A0-A15

AEN

IOR#

IOW#

IOCHRDY

IRQ3-7,9-12,15

DREQ0,1,3,5

DACK0,1,3,5#

TC

ISA Bus

Plug-and-Play

Controller

VCC

MAN#

To External

EEPROM

EED

EECLK

EECS

EEPROM

Controller

UART Channel A

Transmit

FIFO

(128

bytes)

Transmit

Shift

Register

IrDA

v1.0

Encoder

UART

Control

Registers

Receive

FIFO

(128

bytes)

Receive

Shift

Register

IrDA v1.0

Decoder

Baud Rate Gen.

Modem

Interface

UART Channel B

(same as channel A block)

RESET

XTAL1

(22.1184

MHz)

XTAL2

Osc./

Buffer

7.3728 MHz

Divide

by 3

1284 Bi-directional

Parallel Port Controller with

Level II Electrical Interface

TXA

RXA

To Serial Port A

Transceivers

DTRA#

RTSA#

DSRA#

CTSA#

CDA#

RIA#

TXB,

RXB,

DTR#,

RTS#, etc.

To Serial Port B

Transceivers

PD0-PD7

INIT#

STROBE#

SELCTIN#

AUTOFD#

PDIR

PE

SELECT

BUSY

ACK#

ERR#

To Parallel

Port Printer

Figure 1. Functional Block Diagram with Plug-and-Play Interface

Rev. P1.00

2

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