ISD1200 SERIES
Addressing
In addition to single message application, the ISD1200 series provides a full addressing capability.
The ISD1200 series storage array has 80 distinct addressable segments, providing the following
resolutions per segment. See Application Information for ISD1200 address tables.
TABLE 2: DEVICE PLAYBACK/RECORD DURATIONS
Part Number
ISD1210
Minimum Duration (Seconds)
125 ms
150 ms
ISD1212
7.2. OPERATIONAL MODES
The ISD1200 series is designed with several built-in operational modes provided to allow maximum
functionality with a minimum of additional components, described in details below. The operational
modes use the address pins on the ISD1200 devices, but are mapped outside the valid address
range. When the two Most Significant Bits (MSBs) are HIGH (A6 and A7), 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. Firstly, all operations begin
initially at address 0, which is the beginning address of the ISD1200. Later operations can begin at the
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 but not from playback to
record when A4 is HIGH in Operational Mode.
Secondly, an Operational Mode is executed when any of the control inputs, PLAYE , PLAYL , or
REC , go LOW and the two MSBs are HIGH. This Operational Modes remains in effect until the next
LOW-going control input signal, at which point the current address/mode levels are sampled and
executed.
Note: The two MSBs (A6 & A7) are pins 9 and 10 for ISD1200 series.
Publication Release Date: April 21, 2005
- 11 -
Revision 1.1
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