[rscott2049]

The DMA Sniffer is part of the RP2040 DMA engine. It can perform a variety of functions on the DMA'd data, including CRCs, accumulation, bit-reversal, etc. I use the accumulation function to increment the address contained in the HyperRAM command packet after each scan line is DMA'd from HyperRAM to the scan line buffer. This allows re-use of the HyperRAM command packet, eliminating the need for a per scan line packet (3 uint_32s per scanline). Important for the emulator, as it runs out of RP2040 RAM (vs. flash).

[anyfoo]

Thanks. This got me curious enough that I'm now reading the datasheet. It seems exciting enough that I may likely choose it for my next project that requires a microcontroller. (When I don't want to use FPGAs, which I tend to overuse because I'm a big fan of them, and because cost margins usually don't matter private projects.)

[anyfoo]

Having read the data sheet now, using the DMA Sniffer's accumulation mode to generate PSRAM addresses is pretty genius.