Differences

This shows you the differences between two versions of the page.

--- x68000:dmac [2017/09/11 10:21] – added CCR register neko68k
+++ x68000:dmac [2019/08/27 20:45] (current) – external edit 127.0.0.1
@@ Line 23: / Line 23: @@
 |+0x07|1.b|R/W|[[dmac#ccr|CCR]] - Channel Control Register|
 |+0x08|1.w| |---|
-|+0x0A|1.w|R/W|MTC - Memory Transfer Control|
+|+0x0A|1.w|R/W|[[dmac#mtc|MTC]] - Memory Transfer Control|
-|+0x0C|1.l|R/W|MAR - Memory Address Register|
+|+0x0C|1.l|R/W|[[dmac#mar|MAR]] - Memory Address Register|
 |+0x10|1.l| |---|
-|+0x14|1.l|R/W|DAR - Device Address Register|
+|+0x14|1.l|R/W|[[dmac#dar|DAR]] - Device Address Register|
 |+0x18|1.w| |---|
-|+0x1A|1.w|R/W|BTC - Base Transfer Counter|
+|+0x1A|1.w|R/W|[[dmac#btc|BTC]] - Base Transfer Counter|
-|+0x1C|1.l|R/W|BAR - Base Address Register|
+|+0x1C|1.l|R/W|[[dmac#bar|BAR]] - Base Address Register|
 |+0x20|1.l| |---|
 |+0x24|1.b| |---|
-|+0x25|1.b|R/W|NIV - Normal Interrupt Vector|
+|+0x25|1.b|R/W|[[dmac#niv|NIV]] - Normal Interrupt Vector|
 |+0x26|1.b| |---|
-|+0x27|1.b|R/W|EIV - Error Interrupt Vector|
+|+0x27|1.b|R/W|[[dmac#eiv|EIV]] - Error Interrupt Vector|
 |+0x28|1.b| |---|
-|+0x29|1.b|R/W|MFC - Memory Function Code|
+|+0x29|1.b|R/W|[[dmac#mfc|MFC]] - Memory Function Code|
 |+0x2A|1.w| |---|
 |+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| |---|
 |+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| |---|
 |+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| |---|
 |+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 =====
@@ Line 143: / Line 143: @@
 |  3  |INT - Interrupt enable \\ %0: Enable interrupt \\ %1: Disable interrupt|
 |  2~0  |0|
+---
+MTC<BOOKMARK:mtc> - Memory Transfer Counter (+0x0A) \\
+Number of transfer operands.
+---
+MAR<BOOKMARK:mar> - Memory Address Register (+0x0C) \\
+Start memory transfer address.
+---
+DAR<BOOKMARK:DAR> - Device Address Register (+0x14) \\
+Start device transfer adddress.
+---
+BTC<BOOKMARK:BTC> - Base Transfer Counter (+0x1A) \\
+Number of transfer blocks (the number of transfer information tables) in array chain mode.
+---
+BAR<BOOKMARK:BAR> - Base Address Register (+0x1C) \\
+Start address of the transfer information table in array chain/link array chain mode.
+---
+NIC<BOOKMARK:niv> - Normal Interrupt Vector (+0x25) \\
+Vector number to be used for interrupt generated when CSR ERR is %0.
+---
+EIV<BOOKMARK:eiv> - Error Interrupt Vector (+0x27) \\
+Vector number to be used for the interrupt generated when CSR ERR is %1.
+---
+MFC<BOOKMARK:mfc> - Memory Function Code (+0x29)
+^  7  ^  6  ^  5  ^  4  ^  3  ^  2  ^  1  ^  0  ^
+|  0  |||||  FC2  |  FC1  |  FC0  |
+^Bits^Description^
+|  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|
+---
+CPR<BOOKMARK:cpr> - Channel Priority Register (+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> - Device Function Code (+0x31)
+Same as MFC.
+---
+BFC<BOOKMARK:BFC> - Base Function Code (+0x39)
+Same as MFC.
+---
+GCR<BOOKMARK:GCR> - General Control Register (+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|