Motorola MPC823e Reference Manual page 573

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.
ONE CHANNEL WITH SHADOW RAM FOR DYNAMIC ROUTE CHANGE
SERIAL INTERFACE RAM
( BITS WIDE)
32
Figure 16-47. Configuring the TDM with Dynamic Frames
MOTOROLA
RDM = 01
0
ENTRY
32 ENTRIES
RX
ROUTE
31
64
32 ENTRIES
TX
ROUTE
95
MPC823e REFERENCE MANUAL
Communication Processor Module
FRAMING SIGNALS
32
L1RCLKx
L1RSYNCx
63
96
L1TCLK x
L1TSYNC x
127
16-119