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alternate to primary… until it reads a data structure that is invalid, or until the host processor disables
the channel.
Figure 8.3 (p. 44) shows an example of a ping-pong DMA transaction.
Figure 8.3. Ping-pong example
Task A: Prim ary, cycle_ctrl = b011, 2 R = 4, N = 6
Request
Request
Task A
dm a _don e [ C]
Task B: Alternate, cycle_ctrl = b011, 2 R = 4, N = 12
Request
Task B
Request
Request
dm a _don e [ C]
Task C: Prim ary, cycle_ctrl = b011, 2 R = 2, N = 2
Request
Task C
dm a _don e [ C]
Task D: Alternate, cycle_ctrl = b011, 2 R = 4, N = 5
Request
Request
Task E: Prim ary, cycle_ctrl = b011, 2 R = 4, N = 7
Task D
dm a _don e [ C]
Request
Task E
Request
dm a _don e [ C]
End: Alternate, cycle_ctrl = b000
In Figure 8.3 (p. 44) :
Invalid
Task A
1. The host processor configures the primary data structure for task A.
2. The host processor configures the alternate data structure for task B. This enables the
controller to immediately switch to task B after task A completes, provided that a higher
priority channel does not require servicing.
3. The controller receives a request and performs four DMA transfers.
4. The controller arbitrates. After the controller receives a request for this channel, the flow
continues if the channel has the highest priority.
5. The controller performs the remaining two DMA transfers.
6. The controller sets dma_done[C] HIGH for one HFCORECLK cycle and enters the
arbitration process.
After task A completes, the host processor can configure the primary data structure for task C. This
enables the controller to immediately switch to task C after task B completes, provided that a higher
priority channel does not require servicing.
After the controller receives a new request for the channel and it has the highest priority then task B
commences:
2011-04-12 - d0001_Rev1.10
44
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