spec: DMA memcpy accelerator - #931
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Specifies the
DMAmemcpy table added by #874. It has one row per eight copied bytes (one on the tail), rows chained over a newDMA_NEXTbus,ECALLnumber -3. Adds theADDNWtemplate (ADDwithout wraparound) used for the address updates, and lists -3 in the ECALL overview.Two deliberate deviations from #874's Rust:
ADDNWconditions the whole addition oncond, whereasemit_add_pair_no_overflowkeeps the low-limb carry boolean unconditionally. The spec is the more permissive of the two, so it still covers the code.timestampas aWord, as every other chapter does.