51.6.16 Buffer Structure

The DMA read channel is triggered each time a new data is stored in AFEC_LCDR. The same structure of data is repeatedly stored in AFEC_LCDR each time a trigger event occurs. Depending on the user mode of operation (AFEC_MR, AFEC_CHSR, AFEC_SEQ1R, AFEC_SEQ2R) the structure differs. When TAG is cleared, each data transferred to DMA buffer is carried on a half-word (16-bit) and consists of the last converted data right-aligned. When TAG is set, this data is carried on a word buffer (32-bit) and CHNB carries the channel number, thus simplifying post-processing in the DMA buffer and ensuring the integrity of the DMA buffer.