DIGITAL-LOGIC Microspace MSM586SEN Technical User Manual page 166

DIGITAL-LOGIC AG
I/O Ad- Read/Write
dress Status
0008h W
0009h W
000Ah R / W
00Bh W
Description
DMA channel 0-3 command register
bit 7 = DACK sense active high/low
0
1
bit 6 = DREQ sense active high/low
0
1
bit 5 = Write selection
0
1
bit 4 = Priority
0
1
bit 3 = Timing
0 Normal
1 Rotating
bit 2 = Controller enable/disable
0
1
bit 1 = Memory-to-memory enable/disable
0
1
bit 0 = Reserved
DMA write request register
DMA channel 0-3 mask register
bits 7-3 = Reserved
bit 2 = 0
1
bits 1-0 = Channel Select
00 Channel 0
01 Channel 1
10 Channel 2
11 Channel 3
DMA channel 0-3 mode register
bits 7-6 = 00 Demand mode
01 Single mode
10 Block mode
11 Cascade mode
bit 5 = 0 Address increment select
1 Address decrement select
bit 4 = 0 Disable auto initialization
1 Enable auto initialization
bits 3-2 = Operation type
00 Verify operation
01 Write to memory
10 Read from memory
11 Reserved
bits 1-0 = Channel select
00 Channel 0
01 Channel 1
10 Channel 2
11 Channel 3
50
MSM586SEN/SEV Manual V1.5E
low
high
low
high
Late write selection
Extended write selection
Fixed
Rotating
Enable
Disable
Disable
Enable
Clear bit
Set bit
Continued..
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