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The shadow link EDMA parameter set is used to reload the original EDMA parameter set for a particular channel once the transfer is complete. This is called linking, and is an EDMA specific detail. Please refer to the EDMA user guide to see how this is implemented and its use cases.
The hot signature channel is used to trigger the HWA. The signature channel copies a one-hot signature word to the DMA2ACCTRIG register to trigger a HWA parameter set. This is a way to trigger the HWA, and is a HWA specific implementation detail. Please refer to the HWA user guide for more details.
The signature channel is configured to run after some other channel which copies data in/out of HWA RAM. This is accomplished by chaining of the EDMA channels, which is an EDMA specific feature.
