x68000:dmac
Differences
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x68000:dmac [2017/09/11 10:37] – [Register Descriptions] forgot some bits for MFC neko68k | x68000:dmac [2019/08/27 20:45] (current) – external edit 127.0.0.1 | ||
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Line 39: | Line 39: | ||
|+0x2A|1.w| |---| | |+0x2A|1.w| |---| | ||
|+0x2C|1.b| |---| | |+0x2C|1.b| |---| | ||
- | |+0x2D|1.b|R/ | + | |+0x2D|1.b|R/ |
|+0x2E|1.w| |---| | |+0x2E|1.w| |---| | ||
|+0x30|1.b| |---| | |+0x30|1.b| |---| | ||
- | |+0x31|1.b|R/ | + | |+0x31|1.b|R/ |
|+0x32|3.w| |---| | |+0x32|3.w| |---| | ||
|+0x38|1.b| |---| | |+0x38|1.b| |---| | ||
- | |+0x39|1.b|R/ | + | |+0x39|1.b|R/ |
|+0x3A|1.l| |---| | |+0x3A|1.l| |---| | ||
|+0x3E|1.b| |---| | |+0x3E|1.b| |---| | ||
- | |+0x3F|1.b|R/ | + | |+0x3F|1.b|R/ |
===== Register Descriptions ===== | ===== Register Descriptions ===== | ||
Line 189: | Line 189: | ||
| 7~3 |0| | | 7~3 |0| | ||
| 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| | | 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< | ||
+ | |||
+ | ^ 7 ^ 6 ^ 5 ^ 4 ^ 3 ^ 2 ^ 1 ^ 0 ^ | ||
+ | | 0 |||||| | ||
+ | |||
+ | ^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< | ||
+ | Same as MFC. | ||
+ | |||
+ | --- | ||
+ | |||
+ | BFC< | ||
+ | Same as MFC. | ||
+ | |||
+ | --- | ||
+ | |||
+ | GCR< | ||
+ | |||
+ | ^ 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.1505090239.txt.gz · Last modified: 2019/08/27 20:44 (external edit)