Selection Mode; Using Two Partitions - Texas Instruments TMS320VC5501 Reference Manual

5.4 Using Two Partitions

5.4.1 Assigning Blocks to Partitions A and B
SPRU592E
For multichannel selection operation in the receiver and/or the transmitter, you
can use two partitions or eight partitions. If you choose the 2-partition mode
(RMCME = 0 for reception, XMCME = 0 for transmission), McBSP channels
are activated using an alternating scheme. In response to a frame-sync pulse,
the receiver or transmitter begins with the channels in partition A and then
alternates between partitions B and A until the complete frame has been
transferred. When the next frame-sync pulse occurs, the next frame is
transferred, beginning with the channels in partition A.
For reception, any two of the eight receive-channel blocks can be assigned to
receive partitions A and B, which means up to 32 receive channels can be
enabled at any given point in time. Similarly, any two of the eight
transmit-channel blocks (up 32 enabled transmit channels) can be assigned
to transmit partitions A and B.
For reception:
Assign an even-numbered channel block (0, 2, 4, or 6) to receive partition
-
A by writing to the RPABLK bits. In the receive multichannel selection
mode, the channels in this partition are controlled by receive channel
enable register A (RCERA).
Assign an odd-numbered block (1, 3, 5, or 7) to receive partition B with the
-
RPBBLK bits. In the receive multichannel selection mode, the channels
in this partition are controlled by receive channel enable register B
(RCERB).
For transmission:
Assign an even-numbered channel block (0, 2, 4, or 6) to transmit partition
-
A by writing to the XPABLK bits. In one of the transmit multichannel
selection modes, the channels in this partition are controlled by transmit
channel enable register A (XCERA).
Assign an odd-numbered block (1, 3, 5, or 7) to transmit partition B with
-
the XPBBLK bits. In one of the transmit multichannel selection modes, the
channels in this partition are controlled by transmit channel enable register
B (XCERB).
Using Two Partitions
Multichannel Selection Modes 5-5