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ST78C36ACJ44

ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO

Exar Corporation 

ST78C36/36A

ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO

APRIL 2010

REV. 5.1.0

GENERAL DESCRIPTION

The ST78C36/36A is a monolithic Parallel Port

Interface for use with IBM PC compatible platforms.

Operation as a standard Centronics printer port is the

default, but software may re-configure the device to

support bi-directional IBM PS/2 parallel port,

Enhanced Parallel Port (EPP), or the Extended

Capabilities Port (ECP, as defined by Hewlett

Packard and Microsoft) modes. The ECP modes are

supported by a 16 byte FIFO that may be accessed

by programmed I/O or DMA cycles.

FIGURE 1. ST78C36/36A BLOCK DIAGRAM

APPLICATIONS

• Printers, Scanners and other peripherals

• ZIP Drives and back up drives

• Printer Server

• Embedded Applications

FEATURES

• IBM AT bus compatible

• Bi-directional port capability

• 16 byte FIFO for ECP modes

• On-chip oscillator (ST78C36A, ST78C36Q64)

• Software selectable Interrupt (5, 7, or 9) and 8-bit

DMA channel (ST78C36CQ64)

D0-D7

-IOR

-IOW

RESET

A0-A2

A10

-CS

AEN

-IOR, -IOW

-IRQx

IOCHRDY

DRQx

PDIR

TC

-DACKx

Printer

FIFO

Registers

Printer

Data

Ports

Printer

Control

Logic

PD0-PD7

-STROBE

INIT

-AUTOFDX

-SELCTIN

PE, SELECT

BUSY, -ACK

-ERROR

Clock

&

Timing

Generator

XTAL2

XTAL1

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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