Service Chain Example - Texas Instruments OMAP5912 Reference Manual

4.4.1

Service Chain Example

SPRU755B
Figure 20 shows a DMA service chain applied to the DARAM port, the external
memory port, and the peripherals port. The service chain has the following
programmed characteristics. A list of activity in the ports is provided after
Figure 20.
Channels 0, 2, and 5 are high priority (PRIO = 1 in DMA_CCR). Channels
-
1, 3, and 4 are low priority (PRIO = 0).
Channels 1, 2, and 4 are enabled (EN = 1 in DMA_CCR). Channels 0, 3,
-
and 5 are disabled (EN = 0).
The MPUI shares the internal memory with the channels (MPUI_EXCL = 0
-
in DMA_GCR) and is treated like a low-priority channel (MPUI_PRIO = 0
in DMA_GCR). The MPUI is shown as disconnected in the peripherals
port, because the MPUI cannot access the peripherals port.
Table 99 summarizes the activity at the ports in Figure 20.
Direct Memory Access (DMA) Support
DSP DMA
131