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DMA Request Sources
DSP56366 24-Bit Digital Signal Processor User Manual, Rev. 4
4-12 Freescale Semiconductor
4.5 DMA Request Sources
The DMA Request Source bits (DRS0-DRS4 bits in the DMA Control/Status registers) encode the source
of DMA requests used to trigger the DMA transfers. The DMA request sources may be the internal
peripherals or external devices requesting service through the IRQA, IRQB, IRQC and IRQD pins. The
DMA Request Sources are shown in Table 4-7.
Table 4-7 DMA Request Sources
DMA Request Source Bits
DRS4...DRS0
Requesting Device
00000 External (IRQA
pin)
00001 External (IRQB pin)
00010 External (IRQC pin)
00011 External (IRQD
pin)
00100 Transfer Done from DMA channel 0
00101 Transfer Done from DMA channel 1
00110 Transfer Done from DMA channel 2
00111 Transfer Done from DMA channel 3
01000 Transfer Done from DMA channel 4
01001 Transfer Done from DMA channel 5
01010 DAX Transmit Data
01011 ESAI Receive Data (RDF=1)
01100 ESAI Transmit Data (TDE=1)
01101 SHI HTX Empty
01110 SHI FIFO Not Empty
01111 SHI FIFO Full
10000 HDI08 Receive Data
10001 HDI08 Transmit Data
10010 TIMER0 (TCF=1)
10011 TIMER1 (TCF=1)
10100 TIMER2 (TCF=1)
10101 ESAI_1 Receive Data (RDF=1)
10110 ESAI_1 Transmit Data (TDE=1)
10111-11111 Reserved