
Receive Multichannel Selection Mode
Multichannel Selection Modes
5-10
SPRU592E
5.6 Receive Multichannel Selection Mode
The RMCM bit of MCR1 determines whether all channels or only selected
channels are enabled for reception. When RMCM = 0, all 128 receive
channels are enabled and cannot be disabled. When RMCM = 1, the receive
multichannel selection mode is enabled. In this mode:
-
Channels can be individually enabled or disabled. The only channels
enabled are those selected in the appropriate receive channel enable
registers (RCERs). The way channels are assigned to the RCERs
depends on the number of receive channel partitions (2 or 8), as defined
by the RMCME bit of MCR1.
-
If a receive channel is disabled, any bits received in that channel are
passed only as far as the receive buffer register(s) (RBR(s)). The receiver
does not copy the content of the RBR(s) to the DRR(s), and as a result,
does not set the receiver ready bit (RRDY). Therefore, no DMA
synchronization event (REVT) is generated, and if the receiver interrupt
mode depends on RRDY (RINTM = 00b), no interrupt is generated.
As an example of how the McBSP behaves in the receive multichannel
selection mode, suppose you enable only channels 0, 15, and 39 and that the
frame length is 40. The McBSP:
1) Accepts bits shifted in from the DR pin in channel 0
2) Ignores bits received in channels 1–14
3) Accepts bits shifted in from the DR pin in channel 15
4) Ignores bits received in channels 16–38
5) Accepts bits shifted in from the DR pin in channel 39
Summary of Contents for TMS320VC5509
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Page 201: ...Emulation Power and Reset Considerations 10 10 SPRU592E ...
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