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Rabbit 6000 User’s Manual
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266
DMA y Buffer Complete Register
(D0BCR)
(Address = 0x0103)
(D1BCR)
(Address = 0x0113)
(D2BCR)
(Address = 0x0123)
(D3BCR)
(Address = 0x0133)
(D4BCR)
(Address = 0x0143)
(D5BCR)
(Address = 0x0153)
(D6BCR)
(Address = 0x0163)
(D7BCR)
(Address = 0x0173)
(D8BCR)
(Address = 0x0903)
(D9BCR)
(Address = 0x0913)
(D10BCR)
(Address = 0x0923)
(D11BCR)
(Address = 0x0933)
(D12BCR)
(Address = 0x0943)
(D13BCR)
(Address = 0x0953)
(D14BCR)
(Address = 0x0963)
(D15BCR)
(Address = 0x0973)
Bit(s)
Value
Description
7:0
Read
The DMA increments a counter at the start of each buffer. This count is
latched in this register and can be used, along with the
buffer unused
count, to determine the actual amount of data transferred by the DMA.
This counter is initialized by a start command or when the DMA is
automatically rewound to the initial address.
Write
Writing to this register loads the counter. This feature is intended only for
testing, because the DMA automatically resets the counter to all ones
when fetching from the initial address. The counter is incremented
whenever the DMA fetches a new buffer length value from a descriptor.
DMA Master Control Register
(DMCR)
(Address = 0x0104)
Bit(s)
Value
Description
7:4
These bits are reserved and should be written with zeros.
3:2
00
DMA transfers at Priority 0. No DMA transfers while CPU operates at
Priority 3, 2, or 1.
01
DMA transfers at Priority 1. No DMA transfers while CPU operates at
Priority 3 or 2.
10
DMA transfers at Priority 2. No DMA transfers while CPU operates at
Priority 3.
11
DMA transfers at Priority 3. DMA transfers at any time.
1:0
00
DMA interrupts are disabled.
01
DMA interrupts use Interrupt Priority 1.
10
DMA interrupts use Interrupt Priority 2.
11
DMA interrupts use Interrupt Priority 3.
Summary of Contents for 6000
Page 1: ...Rabbit 6000 Microprocessor User s Manual 90001108_J...
Page 11: ...Rabbit 6000 User s Manual digi com 11 1 3 Block Diagram Figure 1 1 Rabbit 6000 Block Diagram...
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Page 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
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Page 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...