Multi-Channel Buffered Serial Port (McBSP)
Definition: Word and Frame
“Frame” - contains one or multiple words
w0 w1 w2 w3 w4 w5 w6 w7
Frame
Word
w6 w7
D
FS
Number of words per frame: 1-128
Multi-Channel Selection
Ch0-0
Ch0-1
Ch5-0
Ch5-1
Ch27-0
Ch27-1
Multi-channel mode controlled primarily via two registers:
MCR
Multi-channel Control Reg
(enables Mc-mode)
R/XCER (A-H)
Rec/Xmt Channel Enable Regs
(enable/disable channels)
Up to 128 channels can be enabled/disabled
C
O
D
E
C
M
c
B
S
P
Frame TDM Bit Stream
Ch0Ch1Ch31
...
0
Ch0Ch1Ch31
...
1
Transmit
&
Receive
only selected
Channels
Multi-channel
Allows multiple channels (words) to be independently selected for transmit
and receive (e.g. only enable Ch0, 5, 27 for receive, then process via CPU)
The McBSP keeps time sync with all channels, but only “listens” or “talks”
if the specific channel is enabled (reduces processing/bus overhead)
11 - 18 C28x - Communications
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