Table 4-5 Dma Request Sources; Dma Request Sources - Motorola DSP56309 User Manual

Core Configuration

DMA Request Sources

Table 4-4 Interrupt Source Priorities within an IPL (Continued)
Priority
Ñ
Lowest
4.5 DMA REQUEST SOURCES
The DMA request source bits (DRS[4:0]) in the DMA control/status registers) encode the
source of DMA requests used to trigger DMA transfers. The DMA request sources can
be internal peripherals or external devices requesting service through the IRQA, IRQB,
IRQC, or IRQD signals. Table 4-5 describes the meanings of the DRS bits.
DMA Request Source Bits
DRS4... DRS0
4-16
TIMER2 Overflow Interrupt
TIMER2 Compare Interrupt

Table 4-5 DMA Request Sources

00000 External (IRQA signal)
00001 External (IRQB signal)
00010 External (IRQC signal)
00011 External (IRQD signal)
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 ESSI0 Receive Data (RDF0 = 1)
01011 ESSI0 Transmit Data (TDE0 = 1)
01100 ESSI1 Receive Data (RDF1 = 1)
DSP56309UM/D
Interrupt Source
Requesting Device
MOTOROLA