SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
A null PaRAM set is defined as a PaRAM set where all count fields (EDMA_TPCC_ABCNT_n[15:0] ACNT, EDMA_TPCC_ABCNT_n[31:16] BCNT, and EDMA_TPCC_CCNT_n[15:0] CCNT) are cleared to 0. If a PaRAM set associated with a channel is a NULL set, then when serviced by the EDMA_TPCC, the bit corresponding to the channel is set in the associated event missed register (EDMA_TPCC_EMR, EDMA_TPCC_EMRH, or EDMA_TPCC_QEMR). This bit remains set in the associated secondary event register (EDMA_TPCC_SER, EDMA_TPCC_SERH, or EDMA_TPCC_QSER).
This implies that any future events on the same channel are ignored by the EDMA_TPCC and it is required to clear the bit in EDMA_TPCC_SER, EDMA_TPCC_SERH, or EDMA_TPCC_QSER for the channel. This is considered an error condition, since events are not expected on a channel that is configured as a null transfer.