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Enhanced DMA Byte Munging Options #795
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As discussed on Discord, a relevant feature would be support of 4-bit data (NCM mode).
We should use a new NCM_MODE (or 4BPP_MODE) with three bits for this, |
Two more modes, which are POSSIBLY "out of scope" because it's not "feeling" like 8/16bit function:
|
There is value in being able to munge values being copied via DMA, e.g. a pipeline like the following:
ADD value
then
AND
then
EOR
then
OR
By default the ADD value would be $00 and AND would be $FF, and the other two being $00
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