SN75ALS164

OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVER

SLLS022C – JUNE 1986 – REVISED MAY 1998

2

POST OFFICE BOX 655303

CHANNEL IDENTIFICATION TABLE

NAME

IDENTITY

CLASS

DC

TE

SC

Direction-Control

Talk-Enable

System Control

Control

ATN

SRQ

REN

IFC

EOI

Attention

Service Request

Remote Enable

Interface Clear

End or Identity

Bus

Management

ATN+EOI

ATN Logical or EOI

Logic

DAV

NDAC

NRFD

Data Valid

No Data Accepted

Not Ready for Data

Data

Transfer

Function Tables

RECEIVE/TRANSMIT FUNCTION TABLE

CONTROLS

BUS-MANAGEMENT CHANNELS

DATA-TRANSFER CHANNELS

SC

DC

TE

ATN†

ATN†

SRQ

REN

IFC

EOI

DAV

NDAC

NRFD

(controlled by DC)

(controlled by SC)

(controlled by TE)

H

H

H

R

T

T

T

R

R

H

H

L

R

T

R

T

R

R

L

L

H

T

R

R

R

T

T

L

L

L

T

R

T

R

T

T

H

L

X

R

T

R

R

T

T

L

H

X

T

R

T

T

R

R

H

T

T

L

R

R

H = high level, L = low level, R = receive, T = transmit, X = irrelevant

Direction of data transmission is from the terminal side to the bus side, and the direction of data receiving is from the bus side to the terminal side.

Data transfer is noninverting in both directions.

† ATN is a normal transceiver channel that functions additionally as an internal direction control or talk enable for EOI when the DC and TE inputs

are in the same state. When DC and TE are in opposite states, the ATN channel functions as an independent transceiver only.

ATN + EOI FUNCTION TABLE

INPUTS

OUTPUT

ATN

EOI

ATN + EOI

H

X

H

X

HH

L

L

L