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Rabbit 6000 User’s Manual
digi.com
255
24.2 Dependencies
24.2.1 I/O Pins
External DMA Request 0 can be enabled from pins PD2, PE2, or PE6. External DMA Request 1 can be
enabled from pins PD3, PE3, or PE7.
The DMA can be directed to use either the memory bus or the External I/O bus to perform its transfers,
and will use either the memory bus or External I/O bus strobes as appropriate.
24.2.2 Clocks
The DMA peripheral uses the peripheral clock for all operations. If the timed request option is enabled,
then the 16-bit timed request counter will be clocked by the peripheral clock and will provide a DMA
request each time it counts down to zero.
24.2.3 Other Registers
24.2.4 Interrupts
Each DMA channel has its own dedicated interrupt that can occur at the end of any DMA transfer, as spec-
ified in DyCR (normally loaded from the buffer descriptor). The interrupt request is automatically cleared
when the interrupt is handled.
The DMA interrupt vectors are in the EIR starting at offsets 0x080–0x0F0 for DMA Channels 0 to 7, and
0x180–0x1F0 for DMA Channels 8 to 15. They can be set as Priority 1, 2, or 3.
DMA y Link Address [15:8] Register
0x01vD
0x09yD
DMA y Link Address [23:16] Register
0x01vE
0x09yE
Register
Function
NCDWR
Sets number of wait states for DMA accesses to
the Wi-Fi peripheral.
Register Name
DMA Channels 0-7
DMA Channels 8-15
Содержание 6000
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