Communication Processor Module
MOTOROLA
MPC823e REFERENCE MANUAL
16-119
SERIAL
I/F
COMMUNICATION
16
PROCESSOR MODULE
16.7.4.2 ONE MULTIPLEXED CHANNEL WITH DYNAMIC FRAMES.
In this
configuration, there is one multiplexed channel and it has 32 entries for transmit data and
strobe routing and 32 entries for receive data and strobe routing. In each RAM, one of the
partitions is the current-route RAM and the other is a shadow RAM that allows you to change
the serial routing. After programming the shadow RAM, set the
CSRRx
bit of the associated
channel in the SIMCR to receive and the
CSRTx
bit to transmit. When the next frame sync
arrives, the serial interface automatically exchanges the current-route RAM for the shadow
RAM. Refer to
Section 16.7.4.6 Serial Interface RAM Dynamic Changes
for more details
on how to dynamically change the channel route. You must only use this configuration when
the routing on the time-division multiplex needs to be dynamically changed.
Figure 16-47. Configuring the TDM with Dynamic Frames
32 ENTRIES
RX
ROUTE
FRAMING SIGNALS
L1RCLKx
L1RSYNCx
SERIAL INTERFACE RAM ENTRY
0
32 ENTRIES
TX
ROUTE
31
95
64
L1TCLK
x
L1TSYNC
x
96
32
63
127
(
32
BITS WIDE)
ONE CHANNEL WITH SHADOW RAM FOR DYNAMIC ROUTE CHANGE
RDM = 01
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