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Appendix A: Memory and Register Mapping
A-20
AM700 Audio Measurement Set Service Manual
Table A-29: DMA interface address translation
DSP 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Host x
a
x 31 30 29 28 27 26 25 24 23 22 21 20 19 18
DSP 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Host 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2
DSP *
b
*
Host 1 0
a
X = don’t care
b
* = ground
Table A-30: Host/DMA address translation examples
DSP Address Host Address
CC00 0000 3000 0000
CC00 0001 3000 0004
CC00 0002 3DSP Address000 0008
CC00 0003 3000 000C
CC00 0004 3000 0010
CC00 0005 3000 0014
CC0F FFFF 303F FFFC
Translate DSP DMA address to Host DMA address
Host Address = ((DSP address) << 2 ) & 0xfffffffc
Translate Host DMA address (long word addressing) to DSP DMA address
DSP Address = ((Host address) >> 2) | 0xc0000000
Translation Examples