Enabling Multichannel Selection; Enabling And Masking Of Channels In Normal Multichannel Selection Mode; Element Enabling By Subframes In Partitions A And B - Texas Instruments TMS320C6000 Reference Manual

8.1

Enabling Multichannel Selection

8.2 Enabling and Masking of Channels in Normal Multichannel Selection
Mode
Figure 41.

Element Enabling by Subframes in Partitions A and B

Subframe # 0
(R/X)PABLK 0
Partition A
0-15
elements
(R/X)PBBLK
Partition B
elements
FS(R/X) Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á
Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á
SPRU580C
Multichannel mode can be enabled independently for reception and
transmission by setting the RMCM bit to 1 and the XMCM bit to a nonzero value
in MCR, respectively.
This section describes how to enable the channels in normal multichannel
selection mode. For the C64x DSP, see also section 8.3 for the enhanced
multichannel selection mode.
For all C6000 devices, a total of 32 of the available 128 elements can be
enabled at any given time. The 128 elements comprise eight subframes (0
through 7), and each subframe has 16 contiguous elements. Even-numbered
subframes 0, 2, 4, and 6 belong to partition A; odd-numbered subframes 1, 3,
5, and 7 belong to partition B.
The number of elements enabled can be updated during the course of a frame
to allow any arbitrary group of elements to be enabled. This update is
accomplished using an alternating ping-pong scheme for controlling two
subframes (one odd-numbered and the other even-numbered) of 16
contiguous elements within a frame at any time. One subframe belongs to
partition A and the other to partition B.
Any one 16-element block from partition A and partition B can be selected,
yielding a total of 32 elements that can be enabled at one time. The subframes
are allocated on 16-element boundaries within the frame, as shown in
Figure 41. The (R/X)PABLK and (R/X)PBBLK fields in MCR select the
subframes in partition A and B, respectively. This enabling is performed
independently for transmit and receive.
1 2
1
32-47
0
16-31
3 4 5
2
64-79
1 2
48-63 80-95
Multichannel Buffered Serial Port (McBSP)
Multichannel Selection Operation
6 7
3
96-111
3
112-127
0
0
0-15
69