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Rotating Priority
The priority of channels 0 to 3 rotates—that is, every time a new selection
is made, the priority is set again. The priority of the channels after reset is:
• channel 3 (highest)
• channel 2
• channel 1
• channel 0 (lowest)
Every time a new selection is made, the priority changes. The newly
selected channel receives the highest priority, where priority descends in
the same order as above, but in a cyclical fashion. For example, if channel
1 becomes the next selected channel, the priority is:
• channel 1 (highest)
• channel 0
• channel 3
• channel 2 (lowest)
If the next selected channel is channel 0, the priority scheme is:
• channel 0 (highest)
• channel 3
• channel 2
• channel 1 (lowest)
The priority within channels 0 to 3 is kept while higher priority channels
(one or more of channels 4–13) are selected. When the higher priority
channel (or channels) completes its transfer, the last priority order for
channels 0 to 3 is kept unchanged.
ADSP-TS101 TigerSHARC Processor
Hardware Reference
Direct Memory Access
7-39
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