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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.
TWO CHANNELS WITH SHADOW RAM FOR DYNAMIC ROUTE CHANGE
SERIAL INTERFACE RAM ENTRY
(32 BITS WIDE)
0
16 ENTRIES
RXA
ROUTE
31
128
16 ENTRIES
TXA
ROUTE
159
Figure 16-49. Configuring Two TDMs with Dynamic Frames
MOTOROLA
RDM = 11
FRAMING SIGNALS
64
32
L1RCLKA
L1RSYNCA
95
63
192
160
L1TCLKA
L1TSYNCA
223
191
MPC823e REFERENCE MANUAL
Communication Processor Module
FRAMING SIGNALS
96
L1RCLK b
L1RSYNC b
16 ENTRIES
RXB
ROUTE
127
224
L1TCLK b
L1TSYNC b
16 ENTRIES
TXB
ROUTE
255
16-121
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