ADSP-214xx SHARC Processor Hardware Reference 4-25
Link Ports—ADSP-2146x
2. The processor enables the link port by setting the
LEN bit and
enables the link port DMA by setting the LDEN bit in the LCTLx
register. Because this is a transmit, setting LDEN automatically
asserts an internal DMA request.
3. After the request is granted the internal DMA transfer is performed
filling the TXLBx buffer’s FIFO.
4. The external device begins reading data from the TXLBx buffer
through the link port.
5. The TXLBx buffer detects that there is room in the buffer (partially
empty) and asserts another DMA request continuing the process.
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