Analog Devices ADSP-21261 SHARC Hardware Reference Manual page 305

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The sequence for setting up and starting a chained DMA is outlined in the

following steps and can also be seen in

1. Configure the TCB associated with each DMA in the chain except

for the first DMA in the chain.

2. Write the first three parameters for the initial DMA to the

3. Select a baud rate using the

4. Select which flag to use as the SPI slave select signal in the

5. Configure and enable the SPI port with the

6. Configure the DMA settings for the entire sequence, enabling

DMA and DMA chaining in the

7. Begin the DMA by writing the address of a TCB (describing the

second DMA in the chain) to the

8. Clear the chain pointer register before enabling chaining.

The address field of the chain pointer registers is only 19 bits wide. If a

program writes a symbolic address to bit 19 of the chain pointer, there

may be a conflict with the

the address, then AND the

ADSP-2126x SHARC Processor Hardware Reference

registers directly.

bit. Programs should clear the upper bits of

bit separately, if needed. For example:

"Chained DMA Transfers" on

I/O Processor

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