Communication Processor Module
16-126
MPC823e REFERENCE MANUAL
MOTOROLA
SERIAL
I/F
COMMUNICATION
16
PROCESSOR MODULE
If two TDMs with dynamic changes are programmed, the initial current-route RAM
addresses in the serial interface RAM are as follows:
• 0–31 RXA Route
• 64–95 RXB Route
• 128–159 TXA Route
• 192–223 TXB Route
The shadow RAMs are at addresses:
• 32–63 RXA Route
• 96–127 RXB Route
• 160–191 TXA Route
• 224–255 TXB Route
You can read any RAM at any time, but for proper serial interface operation you must not try
to write the current-route RAM. You can, however, read the serial interface status register
(SISTR) to find out which part of the RAM is the current-route RAM.
Besides knowing which RAM is the current-route RAM, you might need to know which entry
the time-slot assigner is currently using within the current-route RAM. This information is
provided in the SIRP register, which is described in detail in
Section 16.7.5.6 Serial
Interface RAM Pointer Register
. You can also externally connect one of the eight strobes
to an interrupt pin to generate an interrupt on a particular serial interface RAM entry starting
or ending execution by the time-slot assigner.
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