Analog Devices ADSP-TS101 TigerSHARC Hardware Reference Manual page 271

Priority is also set according to these considerations:
• Incoming data has higher priority than outgoing data, in order to
reduce the possibility of stalling the cluster bus. For this reason, the
AutoDMA register channels are assigned the highest priority.
Receiving links have priority over transmitting links.
• The links have higher priority than the external ports because their
lower bandwidth is not likely to block the bus.
• External port channels have a rotating priority. The sequence in
which they rotate is 3-2-1-0.
• If the
PR
priority inside its group. If more than one channel has one of its
bits set in the
priority list.
ADSP-TS101 TigerSHARC Processor
Hardware Reference
bit is set in register
TCBx
register
TCB DP
Direct Memory Access
, channel x asserts the highest
DP
, priority is resolved according to the
PR
7-37