Communication Processor Module
MOTOROLA
MPC823e REFERENCE MANUAL
16-121
SERIAL
I/F
COMMUNICATION
16
PROCESSOR MODULE
16.7.4.4 TWO MULTIPLEXED CHANNELS WITH DYNAMIC FRAMES.
In this
configuration, there are two multiplexed channels. Each channel has 16 entries for transmit
data and strobe routing and 16 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 serial interface command register 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. This
configuration when you are using two TDMs and the routing needs to be dynamically
changed.
Figure 16-49. Configuring Two TDMs with Dynamic Frames
16 ENTRIES
RXA
ROUTE
FRAMING SIGNALS
L1RCLKA
L1RSYNCA
SERIAL INTERFACE RAM ENTRY
16 ENTRIES
TXA
ROUTE
31
159
128
L1TCLKA
L1TSYNCA
160
32
63
191
(32
BITS WIDE)
TWO CHANNELS WITH SHADOW RAM FOR DYNAMIC ROUTE CHANGE
RDM = 11
16 ENTRIES
RXB
ROUTE
FRAMING SIGNALS
L1RCLK
b
L1RSYNC
b
64
16 ENTRIES
TXB
ROUTE
95
223
192
L1TCLK
b
L1TSYNC
b
224
96
127
255
0
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