25.7.7 Event System Output

The DMA provides the ability to generate event triggers based on certain states within a channel. Each channel which is configured to use events can also generate a event system trigger. This output is always active high. The following event system output modes are available:

• Single strobe (1 AHB clock wide pulse) at the end of a block transfer
• Single strobe at the end of each cell transfer
• Output asserted high until cell transfer completes writes
  • Assert high on start trigger detection as con-figured by CHCTRLBk.TRIG or CHCTRLAk.SWFRC
  • Output deasserted low when the channel cell transfer completes writing all data to the destination
• Output asserted high until cell transfer completes reads
  • Assert high on start trigger detection as con-figured by CHCTRLBk.TRIG or CHCTRLAk.SWFRC
  • Output deasserted low when the channel cell transfer completes reading all data from the source