Product Data Sheets

ISD1000A Series

1–6

A6 or A7 = LOW) and 2. ISD1000A Series Opera-

tional Mode Options (A6 AND A7 = HIGH).

Operational mode options are shown in the Oper-

ational Modes table. There are a maximum of 160

message addresses (or segments). Each seg-

ment corresponds to one of 160 rows in the ana-

log storage array. The message addresses

(segments) are in locations 0 through 159 contig-

uous. The playback/record duration of each seg-

ment depends upon the device and is as follows:

An operation may be started at any address, as

defined by address pins A0-A7. Record or play-

back continues with automatic incrementing of the

internal on-chip address until either CE is brought

HIGH (Record), an end of message marker is

encountered (Playback with CE HIGH), or an over-

flow (device full) condition results.

OPERATIONAL MODES

The ISD1000A Series is designed with several

built-in operational modes provided to allow max-

imum functionality with a minimum of additional

components, described in detail below. The oper-

ational modes use the address pins on the

ISD1000A devices, but are mapped outside the

valid address range. When the two Most Signifi-

cant Bits (MSBs) are HIGH (A6 = A7=1), the

remaining address signals are interpreted as

operational modes and direct addressing are not

compatible and cannot be used simultaneously.

There are two important considerations for using

operational modes. First, all operations begin ini-

tially at address 0, which is the beginning of the

ISD1000A address space. Later operations can

begin at other address locations, depending on

the operational mode(s) chosen. In addition, the

address pointer is reset to 0 when the device is

changed from Record to Playback, or when a

Power-Down cycle is executed.

Second, an Operational Mode is executed when

CE goes LOW and the two MSBs are HIGH. This

Operational Mode remains in effect until the next

Part

Number

Segment Playback/Record

Duration

ISD1016A

100 milliseconds

ISD1020A

125 milliseconds

Control

Mode

Function

Typical Use

Jointly Compatible*

M0

Message cueing

Fast-forward through messages

M4, M5

M1

Delete EOM markers

Position EOM marker at the end of the last

message

M3, M4, M5

M2

Cascading

Adding devices to extend message

M3

Looping

Continuous playback from Address 0

M1, M5

M4

Consecutive addressing

Record/Play multiple consecutive mes-

sages

M0, M1, M5

M5

CE level-activated

Allow message pausing

M0, M1, M3, M4

OPERATIONAL MODES TABLE

NOTE:

An asterisk (*) indicates additional operational modes which can be used simultaneously with the given mode.

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