Difference between revisions of "NDMA"

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Line 7: Line 7:
 
!  WIDTH
 
!  WIDTH
 
|-
 
|-
−
|  REG_NDMA_MASTER_CNT
+
|  REG_NDMAGCNT
 
|  0x04004100
 
|  0x04004100
 
|  4
 
|  4
 
|-
 
|-
−
|  REG_NDMA_SRC(n)
+
|  REG_NDMASAD(n)
 
|  0x04004104 + (n*0x1c)
 
|  0x04004104 + (n*0x1c)
 
|  4
 
|  4
 
|-
 
|-
−
|  REG_NDMA_DEST(n)
+
|  REG_NDMADAD(n)
 
|  0x04004108 + (n*0x1c)
 
|  0x04004108 + (n*0x1c)
 
|  4
 
|  4
 
|-
 
|-
−
|  REG_NDMA_NUM0(n)
+
|  REG_NDMATCNT(n)
 
|  0x0400410c + (n*0x1c)
 
|  0x0400410c + (n*0x1c)
 
|  4
 
|  4
 
|-
 
|-
−
|  REG_NDMA_NUM1(n)
+
|  REG_NDMAWCNT(n)
 
|  0x04004110 + (n*0x1c)
 
|  0x04004110 + (n*0x1c)
 
|  4
 
|  4
 
|-
 
|-
−
|  REG_NDMA_14(n)
+
|  REG_NDMABCNT(n)
 
|  0x04004114 + (n*0x1c)
 
|  0x04004114 + (n*0x1c)
 
|  4
 
|  4
 
|-
 
|-
−
|  REG_NDMA_CLEAR(n)
+
|  REG_NDMAFDATA(n)
 
|  0x04004118 + (n*0x1c)
 
|  0x04004118 + (n*0x1c)
 
|  4
 
|  4
 
|-
 
|-
−
|  REG_NDMA_CNT(n)
+
|  REG_NDMACNT(n)
 
|  0x0400411c + (n*0x1c)
 
|  0x0400411c + (n*0x1c)
 
|  4
 
|  4
 
|}
 
|}
  
−
== REG_NDMA_MASTER_CNT ==
+
== REG_NDMAGCNT ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
 
!  DESCRIPTION
 
!  DESCRIPTION
 
|-
 
|-
−
|  15-0
+
|  19-16
−
|  ?
+
|  Cycle selection.
−
|-
 
−
|  16
 
−
|  Unknown, set when initialized by Arm7?
 
−
|-
 
−
|  17
 
−
|  Unknown, set when initialized by Arm9?
 
−
|-
 
−
|  18
 
−
|  Unknown, set when initialized by Arm7/Arm9?
 
−
|-
 
−
|  30-19
 
−
|  ?
 
 
|-
 
|-
 
|  31
 
|  31
−
|  Might be master NDMA enable, when initialized this is set?
+
|  DMA arbitration method. 0=Fixed method, 1=Round robin
 
|}
 
|}
  
−
== REG_NDMA_SRC ==
+
== REG_NDMASAD ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
Line 70: Line 58:
 
|-
 
|-
 
|  31-0
 
|  31-0
−
|  Source data address.
+
|  Source data address. Must be multiple of 4.
 
|}
 
|}
 
Like old DMA, REG_NDMA_SRC is copied to internal registers when written to.
 
Like old DMA, REG_NDMA_SRC is copied to internal registers when written to.
  
−
== REG_NDMA_DEST ==
+
== REG_NDMADAD ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
Line 80: Line 68:
 
|-
 
|-
 
|  31-0
 
|  31-0
−
|  Destination data address.
+
|  Destination data address. Must be multiple of 4.
 
|}
 
|}
 
Like old DMA, REG_NDMA_DEST is copied to internal registers when written to.
 
Like old DMA, REG_NDMA_DEST is copied to internal registers when written to.
  
−
== REG_NDMA_NUM0 ==
+
== REG_NDMATCNT ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
Line 93: Line 81:
 
|}
 
|}
  
−
== REG_NDMA_NUM1 ==
+
== REG_NDMAWCNT ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
Line 102: Line 90:
 
|}
 
|}
  
−
== REG_NDMA_14 ==
+
== REG_NDMABCNT ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
Line 111: Line 99:
 
|}
 
|}
  
−
Once the CNT bit31 enable bit is set, starting doing the DMA once the time units specified by this register elapses?
+
== REG_NDMAFDATA ==
−
 
 
−
== REG_NDMA_CLEAR ==
 
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT
Line 122: Line 108:
 
|}
 
|}
  
−
== REG_NDMA_CNT ==
+
== REG_NDMACNT ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  BIT
 
!  BIT

Revision as of 05:17, 25 November 2010

Registers

There's 4 NDMA channels. Arm7/Arm9 have separate NDMA.

NAME ADDRESS WIDTH
REG_NDMAGCNT 0x04004100 4
REG_NDMASAD(n) 0x04004104 + (n*0x1c) 4
REG_NDMADAD(n) 0x04004108 + (n*0x1c) 4
REG_NDMATCNT(n) 0x0400410c + (n*0x1c) 4
REG_NDMAWCNT(n) 0x04004110 + (n*0x1c) 4
REG_NDMABCNT(n) 0x04004114 + (n*0x1c) 4
REG_NDMAFDATA(n) 0x04004118 + (n*0x1c) 4
REG_NDMACNT(n) 0x0400411c + (n*0x1c) 4

REG_NDMAGCNT

BIT DESCRIPTION
19-16 Cycle selection.
31 DMA arbitration method. 0=Fixed method, 1=Round robin

REG_NDMASAD

BIT DESCRIPTION
31-0 Source data address. Must be multiple of 4.

Like old DMA, REG_NDMA_SRC is copied to internal registers when written to.

REG_NDMADAD

BIT DESCRIPTION
31-0 Destination data address. Must be multiple of 4.

Like old DMA, REG_NDMA_DEST is copied to internal registers when written to.

REG_NDMATCNT

BIT DESCRIPTION
31-0 Number of bytes to copy/write, see REG_NDMA_CNT bit28.

REG_NDMAWCNT

BIT DESCRIPTION
31-0 Number of bytes to copy/write, see REG_NDMA_CNT bit28.

REG_NDMABCNT

BIT DESCRIPTION
31-0 Time related?

REG_NDMAFDATA

BIT DESCRIPTION
31-0 Value to write to destination instead of copying when REG_NDMA_CNT bit13 and bit14 are set.

REG_NDMACNT

BIT DESCRIPTION
10-0 ?
11 Fixed destination address when set.
12 ?
13 When set clear data with the value REG_NDMA_CLEAR instead of copying.
14 Fixed source address when set.
27-15 ?
28 Set when REG_NDMA_NUM0 was set, clear when REG_NDMA_NUM1 was set.
30 IRQ enable
31 Enable/busy
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