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Questions about F287335 XD[0..31] and XINTF to DMA

Yang tianxi
Intellectual 525 points

My program runs in 28335 external RAM IS61LV51216, F28335 XD[0..15] connects to RAM's I/O0 ~  I/O15. Now I want to connects a ADC to F28335, using parallel mode, i.e,  AD converter data port D[0..15] connects to F28335  XD[16..31],  for purpose of using F28335's DMA  to mass data aquisition from ADC, ADC is mapped to address of XINTF

is it possible to do so?  I want to know that during  executing of program, does  data exchange  between CPU and external RAM(low 16-bits of XD[0..31]) affects data on XD[16..31]?  ADC data path from XINTF to DMA works well or not?

Many thanks.

  • 0
    TI__Guru 60865 points

    Hi Yang,

    I think what you want to do is connect XD0 to XD15 to both the external memory and to the external ADC (same with address lines).  Then setup XINTF chip selects for two different XINTF zones to chip selects of both the external devices.  This should let you automatically select between the two external devices.