DSiBrew

NDMA: Difference between revisions

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|  Destination data address. Must be multiple of 4.
|  Destination data address. Must be multiple of 4.
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Like old DMA, REG_NDMA_DEST is copied to internal registers when written to.
Like old DMA, REG_NDMADAD is copied to internal registers when written to.


== REG_NDMATCNT ==
== REG_NDMATCNT ==
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!  DESCRIPTION
!  DESCRIPTION
|-
|-
|  31-0
|  27-0
|  Number of bytes to copy/write, see REG_NDMA_CNT bit28.
|  Total number of words transferred.
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|}


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!  DESCRIPTION
!  DESCRIPTION
|-
|-
|  31-0
|  23-0
|  Number of bytes to copy/write, see REG_NDMA_CNT bit28.
|  Total number of words to transfer.
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!  DESCRIPTION
!  DESCRIPTION
|-
|-
|  31-0
|  15-0
|  Time related?
|  Interval timer.
|-
|  17-16
|  Prescaler. 0=System freq, 1=1/4th freq, 2=1/16th freq, 3=1/64th freq.
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|}


Line 105: Line 108:
|-
|-
|  31-0
|  31-0
|  Value to write to destination instead of copying when REG_NDMA_CNT bit13 and bit14 are set.
|  Fill data.
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!  DESCRIPTION
!  DESCRIPTION
|-
|-
|  10-0
|  11-10
|  ?
|  Destination address update method.
|-
|-
|  11
|  12
|  Fixed destination address when set.
|  Destination address reload flag.
|-
|-
|  12
|  14-13
|  ?
|  Source address update method.
|-
|-
|  13
|  15
|  When set clear data with the value REG_NDMA_CLEAR instead of copying.
|  Source address reload flag.
|-
|-
|  14
|  19-16
|  Fixed source address when set.
|  Block transfer word count.
|-
|-
|  27-15
|  27-24
|  ?
|  Startup mode.
|-
|-
|  28
|  28
|  Set when REG_NDMA_NUM0 was set, clear when REG_NDMA_NUM1 was set.
|  Immediate mode.
|-
|  29
|  Repeating mode.
|-
|-
|  30
|  30
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|-
|-
|  31
|  31
|  Enable/busy
|  Enable/busy flag.
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Retrieved from "https://dsibrew.org/wiki/NDMA"