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ISD1000A View Datasheet(PDF) - Unspecified

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ISD1000A Datasheet PDF : 20 Pages
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ISD1000A Series
Product Data Sheets
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:
Part
Number
Segment Playback/Record
Duration
ISD1016A
100 milliseconds
ISD1020A
-1
125 milliseconds
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
mode bits and NOT as address bits. Therefore,
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
OPERATIONAL MODES TABLE
Control
Mode
M0
M1
M2
M3
M4
M5
Function
Message cueing
Delete EOM markers
Cascading
Looping
Consecutive addressing
CE level-activated
Typical Use
Jointly Compatible*
Fast-forward through messages
Position EOM marker at the end of the last
message
Adding devices to extend message
Continuous playback from Address 0
Record/Play multiple consecutive mes-
sages
Allow message pausing
M4, M5
M3, M4, M5
M1, M5
M0, M1, M5
M0, M1, M3, M4
NOTE: An asterisk (*) indicates additional operational modes which can be used simultaneously with the given mode.
1–6
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