MANTIS_DMA_TR_BYTES
MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES);
MANTIS_DMA_TR_BYTES);
RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES);
buf_pos += MANTIS_DMA_TR_BYTES;
#define MANTIS_DMA_TR_UNITS (MANTIS_BLOCK_BYTES / MANTIS_DMA_TR_BYTES)