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C<br />
O<br />
D<br />
E<br />
C<br />
Multi Multi-Channel Channel Selection<br />
Frame TDM Bit Stream<br />
0 Ch31 ... Ch1 Ch0<br />
1<br />
Ch31 ...<br />
Ch1<br />
Ch0<br />
M<br />
c<br />
B<br />
S<br />
P<br />
Multi-channel<br />
Transmit<br />
&<br />
Receive<br />
only selected<br />
Channels<br />
Ch0-0<br />
Ch0-1<br />
Ch5-0<br />
Ch5-1<br />
Ch27-0<br />
Ch27-1<br />
u Allows multiple channels (words) to be independently selected for transmit<br />
and receive (e.g. only enable Ch0, 5, 27 for receive, then process via CPU)<br />
u The <strong>McBSP</strong> keeps time sync with all channels, but only “listens” or “talks”<br />
if the specific channel is enabled (reduces processing/bus overhead)<br />
u Multi-channel mode controlled primarily via two registers:<br />
Multi-channel Control Reg<br />
MCR<br />
(enables Mc-mode)<br />
u Up to 128 channels can be enabled/disabled<br />
Rec/Xmt Channel Enable Regs<br />
R/XCER (A-H)<br />
(enable/disable channels)<br />
<strong>13</strong> -8
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