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e~.National

~ Semiconcluctor

INS&154 N.ChanRel 12&.by.& Bit

RAM Input/Outriit (RAM

1/0)

General Description

The RAM Input/Output

Chip if'.'

LSI device wh/ch

provides random access memor'

Peripheral inter-

facing for microcomputer

syste

he RAM portion

contains 1024 bits of static R

anized as 128x8,

The 1/0 portion consists of t

ripheral ports of

eight bits each. Each of the 1/0 im ln the two ports

may be defined as an input or': -output to provide

maximum flexibility. Each port

iv be read from or

written to in a parallel (8-bit b ' (mode. To improve

efficiency and simplify programrijing in control-based

applications, a single bit of 1/0 II\' either port may be

Set, cleared or read with a single rrilcTOprocessor instruc-

tion. ,ln addition to basic 1/0, one\of the ports, port A,

may be programmed to operate!1 in several types of

strobed mode with handshake. St(obed mode together

with optional interrupt operation permit both high

speed parallel data transfers and:, interface to a wide

variety of peripherals with no external logic.

The RAM 1/0 is an n-channe! silicon gate device

packaged in a 40-pin dual-in-li". package. It operates

',y

~th a single 5.volt power SUItP and is fully TTL

c<Jmpatible.

~rRIL

1118

-

z

en

CD

....

CIl

~

Z

~

~

Features

0

0

0

0

0

0

::r

m

.

128x8RAM

Single +5-volt power s' plV

Low power dissipatio

-

....

CD

0

0

0

0

0

0

Fully static operation

Completely TTL com

Two 8-bit programma

1/0 port A has TRI-S

~

CD

ibl~脦"

ji

c::r

.

'1/0 ports

;J'El!!>

capability

Handshake controls

Single bit 1/0 operati

Reduces system packs

strobed mode of operation

with single instruction

cou nt

'<

毛o

tU

_0

-

Direct interface with

Independent

operatio"

"

,

JMP

f RAM and 1/0

MICROBUS"TM* comfible

,

,

INS8154

MICROBUSTM

Configuration

-

~

"g

C

-......

.

0'

C

-

'tJ

C

-

-::a

祿

s:

::a

祿

i:

ADDRESS

BUS

CPU'

GRO~

DATA

BUS

CONTRDl

BUS

M

1

C

PORT

BUS

'1'

INS8154

PORT.

,BUS

:::

0

-

~

cs

B MEMR

U

S MEMW

RUET

INRI

NOTE

Th,INTR.g",,1 be.oma_o.ly

mod, wh,. 0

"'ob,d

do" "0

"..n,d,

0.

1. th,

hu

*Trademark,

National Semlconductor

Corp,

DA,B15M4B/Printad

in U.s.A.

197B

Notlonal

Semiconductor

Corp,

next

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