AT7601F datasheet(2/35 Pages) AME

2 / 35 page

AME, Inc.

Printer Port Cotroller

AT7601F

Rev. B.02

4. Pin Description

I - TTL level input

O12 - Out buffer with 12mA drive/sink current

OD12

- Open-drain with 12mA sink current

ICLK - Clock Input

OCLK - Clock Output

Pin No.

Pin name

I/O Type

Function

AEN

DMA Address Enable: active high, DMA controller has control of the

address bus.

IOCHRDY

OD12

I/O channel Ready: active High

4 - 11

DB [0: 7]

I/O12

Data Bus: bi-direction data port

DACK#

DMA Acknowledge: Active low

DRQ

O12

DMA Request: Active high

Terminal count:

XTAL1/CLKIN

ICLK

Crystal oscillator input,

XTAL2

OCLK

Crystal oscillator output,

RESET

System Reset: active high

25, 35

PS/PDIR

O12

Power on strapping

Printer Port Direction Indicator

PINT

OD12/O12

Print Interrupt

42-44

A [0: 2]

Address select line 0 - 2

CS2# /A10

A10: Address select line 10

Chip Select 2: active low, enables the parallel port / CPU data

transfer operation

CS1#

Chip Select 1: active low, enables the parallel port / CPU data

transfer operation

IOW#

I/O write: active low

IOR#

I/O read: active low

Table 1. Host Interface

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