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

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Lista de partido

XR16C872

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

Exar Corporation 

Preliminary

XR16C872

To ISA Bus

D0-D7

A0-A10

AEN

IOR#

IOW#

IOCHRDY

IRQ3

IRQ4

IRQ5

IRQ7

DREQ3

DACK3#

TC

MAN#

GND

S1

Hardwired

S2

or

S3

Jumpers

S4

S5

RESET

XTAL1

(22.1184

MHz)

XTAL2

ISA Bus

Interface

Controller

Address

Decoder for

COM1-4 and

LP1-2

UART Channel A

UART

Control

Registers

Transmit

FIFO

(128

bytes)

Receive

FIFO

(128

bytes)

Transmit

Shift

Register

IrDA

v1.0

Encoder

Receive

Shift

Register

IrDA v1.0

Decoder

Baud Rate Gen.

Modem

Interface

UART Channel B

(same as channel A block)

Osc./

Buffer

7.3728 MHz

Divide

by 3

1284 Bi-directional

Parallel Port Controller with

Level II Electrical Interface

TXA

RX

A

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

Printer Port

Figure 2. Functional Block Diagram with Manual Configuration Interface.

Rev. P1.00

3

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