Analog Devices SHARC ADSP-21368

Setting Up DMA Parameter Registers
2-28 ADSP-21368 SHARC Processor Hardware Reference
• External modify registers (
EMEPx). Modify registers provide the
increment by which the DMA controller post-modifies the corre-
sponding external memory index register after the DMA read or
write.
• External count registers (ECEPx). External count registers indicate
the number of words remaining to be transferred to or from exter-
nal memory on the corresponding DMA channel.
• Memory-to-memory write index register (IIMTMW). This register
provides the base address in memory where DMA writes start.
• Memory-to-memory write modify register (IMMTMW). The MTM
modify register modifies the write index register after each 32-bit
write.
• Memory-to-memory write counter register (CMTMW). The MTM
counter register indicates the quantity of 32-bit data to be trans-
ferred to memory. The counter is decremented by one after each
data write.
• Memory-to-memory read index register (IIMTMR). This register
provides the base address in memory where DMA reads start.
• Memory-to-memory read modify register (IMMTMR). The MTM
modify register modifies the write index register after each 32-bit
read.
• Memory-to-memory read counter register (
CMTMR). The MTM
counter register indicates the quantity of 32-bit data to be read
from memory. The counter is decremented by one after each data
write.