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ST78C36

ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO

Exar Corporation 

REV. 5.1.0

PIN DESCRIPTION

ST78C36/36A

ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO

NAME

VCC

GND

44-PLCC 64-LQFP

TYPE

PIN #

PIN#

44

16, 56 Pwr Power Supply (+5V).

23,30

15, 25,

37, 48,

64

Pwr Supply Ground.

DESCRIPTION

1.0 OVERVIEW

This device is designed around the Hewlett Packard/Microsoft specification for Extended Capabilities Port

Protocol with “ECR mode 100” defined as Enhanced Parallel Port (EPP) mode. The internal timing engines

were designed around a 24 MHz reference, which can be supplied from an external source or by the built-in

oscillator circuit (ST78C36ACJ and ST78C36CQ64 only) with an appropriate crystal.

At system RESET, the device defaults to standard IBM PC compatible Centronics printer mode (output only).

The bi-directional PS/2, EPP, and ECP modes can only be activated by programming the ECR mode field (this

requires address bit A10 = 1, which is outside the normal ISA I/O space).

Optional capabilities of the ECP specification are set as follows:

■ ECP defined interrupts are pulsed, LOW true (Centronics -ACK is non-pulsed, LOW true).

■ PWord size is forced to 1 byte.

■ There is 1 byte in the transmitter that does not affect the FIFO full bit (ECP modes).

■ RLE compression is not supported in hardware.

■ IRQ channel is selectable as 5, 7, or 9 (ST78C36CQ64 only).

■ DMA channel is selectable as 1, 2, or 3 (ST78C36CQ64 only).

■ FIFO THRESHOLD is set at 8 (used only for non-DMA access to the FIFO).

PORT

DATA

ECP-AFIFO

DSR

DCR

EPP-APort

EPP-DPort

C-FIFO

ECP-DFIFO

T-FIFO

Cnfg-A

Cnfg-B

ECR

ADDRESS

000

000

001

002

003

004 - 007

400

400

400

400

401

402

R/W

MODE

FUNCTION

R/W

000, 001

Data Register

W

011

ECP FIFO (Address)

R

All

Status Register

R/W

All

Control Register

R/W

100

EPP Port (Address)

R/W

100

EPP Port (Data)

W

010

Parallel Port Data FIFO

R/W

011

ECP FIFO (Data)

R/W

110

Test FIFO

R

111

Configuration Register A

R/W

111

Configuration Register B

R/W

All

Extended Control Register

5

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