PXR40RM Datasheet, PDF (540/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Enhanced Direct Memory Access Controller (eDMA)
Table 21-4. EDMA_A_MCR Field Descriptions (continued)
Field
Description
16–17
GRP3PRI
18–19
GRP2PRI
20–21
GRP1PRI
22–23
GRP0PRI
24
EMLM
25
CLM
26
HALT
27
HOE
28
ERGA
29
ERCA
30
EDBG
31
Channel group 3 priority. Group 3 priority level when fixed priority group arbitration is enabled.
Channel group 2 priority. Group 2 priority level when fixed priority group arbitration is enabled.
Channel group 1 priority. Group 1 priority level when fixed priority group arbitration is enabled.
Channel group 0 priority. Group 0 priority level when fixed priority group arbitration is enabled.
Enable minor loop mapping.
0 Minor loop mapping disabled. TCD Word 2 is defined as a 32-bit nbytes field.
1 Minor loop mapping enabled. When set, TCDn Word 2 is redefined to include individual enable fields,
an offset field and the NBYTES field. The individual enable fields allow the minor loop offset to be
applied to the source address, the destination address, or both. The NBYTES field is reduced when
either offset is enabled.
Continuous link mode.
0 A minor loop channel link made to itself goes through channel arbitration before being activated again.
1 A minor loop channel link made to itself does not go through channel arbitration before being activated
again. Upon minor loop completion, the channel is active again if that channel has a minor loop channel
link enabled and the link channel is itself. This effectively applies the minor loop offsets and restarts
the next minor loop.
Halt DMA operations.
0 Normal operation.
1 Stall the start of any new channels. Executing channels are allowed to complete. Channel execution
resumes when the HALT bit is cleared.
Halt on error.
0 Normal operation.
1 Any error causes the HALT bit to be set. Subsequently, all service requests are ignored until the HALT
bit is cleared.
Enable round-robin group arbitration.
0 Fixed-priority arbitration is used for selection among the groups.
1 Round-robin arbitration is used for selection among the groups.
Enable Round-Robin Channel Arbitration.
0 Fixed-priority arbitration is used for channel selection within each group.
1 Round-robin arbitration is used for channel selection within each group.
Enable Debug.
0 The assertion of the system debug control input is ignored.
1 The assertion of the system debug control input causes the eDMA to stall the start of a new channel.
Executing channels are allowed to complete. Channel execution resumes when either the system
debug control input is negated or the EDBG bit is cleared.
Reserved
21-16
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor