Texas Instruments OMAP5910 Reference Manual page 129

Table 44. DMA Channel Control Register (DMACCR) Field Descriptions (Continued)
Bits Field
9 REPEAT
8 AUTOINIT
7−0 Reserved
7.2.4.1 Auto-initialization With Unchanging Context
SPRU890A
Value Description
Repeat condition bit. If auto-initialization is selected for a channel
(AUTOINIT = 1), REPEAT specifies one of two special repeat
conditions:
0 Repeat only if ENDPROG = 1.
Once the current DMA transfer is complete, auto-initialization will
wait for the end-of-programming bit (ENDPROG) bit to be set.
1 Repeat regardless of ENDPROG.
Once the current DMA transfer is complete, auto-initialization
occurs regardless of the ENDPROG bit state.
Auto-initialization
auto-initialization, which is the automatic reinitialization of the
channel between DMA block transfers. Use AUTOINIT to enable
or disable this feature.
0 Auto-initialization is disabled.
Activity in the channel stops at the end of the current block transfer.
To stop a transfer immediately, clear the channel enable bit (EN).
1 Auto-initialization is enabled.
Once the current block transfer is complete, the DMA controller
reinitializes the channel and starts a new block transfer. To stop
activity in the channel you have two options:
To stop activity immediately, clear the channel enable bit
-
(EN = 0).
To stop activity after the current block transfer, clear AUTOINIT
-
(AUTOINIT= 0).
Reserved.
If the desired context for the channel needs to be repeated but does not need
to be changed, then the DMA controller is configured with AUTOINIT = 1 and
REPEAT = 1. When REPEAT = 1, the DMA controller ignores the state of the
ENDPROG handshaking bit. After the DSP core has initially configured the
DMA channel, no other DSP core intervention is required to keep the channel
running. Figure 70 shows a detailed sequence of events in this mode.
bit. The DMA controller
DSP Subsystem
DSP DMA
supports
129