Table 21-299. Channel Linking Parameters
Desired Link
Behavior
TCD Control Field Name
Description
Link at end of
Minor Loop
CITER[E_LINK]
Enable channel-to-channel linking on minor loop completion (current
iteration)
CITER[LINKCH]
Link channel number when linking at end of minor loop (current iteration)
Link at end of
Major Loop
CSR[MAJOR_E_LINK]
Enable channel-to-channel linking on major loop completion
CSR[MAJOR_LINKCH]
Link channel number when linking at end of major loop
21.5.7 Dynamic programming
21.5.7.1 Dynamically changing the channel priority
The following two options are recommended for dynamically changing channel priority
levels:
1. Switch to Round-Robin Channel Arbitration mode, change the channel priorities,
then switch back to Fixed Arbitration mode,
2. Disable all the channels, change the channel priorities, then enable the appropriate
channels.
21.5.7.2 Dynamically changing the channel linking and scatter/gather
options
Dynamic channel linking and dynamic scatter/gather is the process of changing the
TCDn_CSR[MAJOR_E_LINK] or TCDn_CSR[E_SG] bits during channel execution.
These bits are read from the TCD local memory at the end of channel execution,
therefore allowing software to enable either feature during channel execution.
Because software can change the configuration during execution, a coherency sequence
must be followed. Consider the scenario the user attempts to execute a dynamic channel
link by enabling the TCDn_CSR[MAJOR_E_LINK] bit as the eDMA engine retires the
channel. The TCDn_CSR[MAJOR_E_LINK] would be set in the programmer's model,
but it would be indeterminate whether the actual link was made before the channel
retired.
The following coherency sequence is recommended when executing a dynamic channel
link or dynamic scatter/gather request:
Initialization/application information
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