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x68000:dmac [2017/09/11 10:35] – added MFC register neko68kx68000:dmac [2017/09/11 10:49] – added CPR, DFC, BFC, and GCR registers neko68k
Line 39: Line 39:
 |+0x2A|1.w| |---| |+0x2A|1.w| |---|
 |+0x2C|1.b| |---| |+0x2C|1.b| |---|
-|+0x2D|1.b|R/W|CPR - Channel Priority Register|+|+0x2D|1.b|R/W|[[dmac#cpr|CPR]] - Channel Priority Register|
 |+0x2E|1.w| |---| |+0x2E|1.w| |---|
 |+0x30|1.b| |---| |+0x30|1.b| |---|
-|+0x31|1.b|R/W|DFC - Device Function Code|+|+0x31|1.b|R/W|[[dmac#dfc|DFC]] - Device Function Code|
 |+0x32|3.w| |---| |+0x32|3.w| |---|
 |+0x38|1.b| |---| |+0x38|1.b| |---|
-|+0x39|1.b|R/W|BFC - Base Function Code|+|+0x39|1.b|R/W|[[dmac#bfc|BFC]] - Base Function Code|
 |+0x3A|1.l| |---| |+0x3A|1.l| |---|
 |+0x3E|1.b| |---| |+0x3E|1.b| |---|
-|+0x3F|1.b|R/W|GCR - General Control Register|+|+0x3F|1.b|R/W|[[dmac#gcr|GCR]] - General Control Register|
  
 ===== Register Descriptions ===== ===== Register Descriptions =====
Line 188: Line 188:
 ^Bits^Description^ ^Bits^Description^
 |  7~3  |0| |  7~3  |0|
-|  2~0  |Memory function code \\ %000: Unused \\ %001: User data \\ %010: User program|+|  2~0  |Memory function code \\ %000: Unused \\ %001: User data \\ %010: User program \\ %011: Unused \\ %100: Unused \\ %101: Supervisor data \\ %110: Supervisor program \\ %111: Interrupt acknowledge| 
 + 
 +--- 
 + 
 +CPR<BOOKMARK:cpr> - (+0x2D) 
 + 
 +^  7  ^  6  ^  5  ^  4  ^  3  ^  2  ^  1  ^  0  ^ 
 +|  0  ||||||  CP  || 
 + 
 +^Bits^Description^ 
 +|  7~2  |0| 
 +|  1~0  |CP - Channel priority \\ %00: Highest priority \\ %01: Second highest priority \\ %10: Third highest priority \\ %11: Lowest priority| 
 + 
 +--- 
 + 
 +DFC<BOOKMARK:DFC> - (+0x31) 
 +Same as MFC. 
 + 
 +--- 
 + 
 +BFC<BOOKMARK:BFC> - (+0x39) 
 +Same as MFC. 
 + 
 +--- 
 + 
 +GCR<BOOKMARK:GCR> - (+0x3F) 
 + 
 +^  7  ^  6  ^  5  ^  4  ^  3  ^  2  ^  1  ^  0  ^ 
 +|  0  ||||  BT  ||  BR  || 
 + 
 +^Bits^Description^ 
 +|  7~4  |0| 
 +|  3~2  |BT - Burst time \\ Number of DMA clock cycles per burst. \\ %00: 16 clocks \\ %01: 32 clocks \\ %10: 64 clocks \\ %11: 129 clocks| 
 +|  1~0  |BR - Bandwidth threshold (band occupancy) \\ %00: 50% \\ %01: 25% \\ %10: 12.5%  \\ %11: 6.25% \\ Note: Only affects channels set to limited speed auto request mode|
x68000/dmac.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1