Parameter set 0
PaRAM
Set
#
Byte
address
0
EDMA Base A 4000h
EDMA Base A 4020h
1
Parameter set 1
EDMA Base A 4040h
2
Parameter set 2
EDMA Base A 4060h
3
Parameter set 3
EDMA Base A 5FC0h
EDMA Base A 5FE0h
254
255
Parameter set 255
Parameter set 254
OPT X
SRC X
BCNT X
ACNT X
DST X
SRCBIDX X
DSTBIDX X
Link=5FE0h
BCNTRLD X
CCNT X
SRCCIDX X
DSTCIDX X
Rsvd
PaRAM set 3
PaRAM set 255
EDMA Base A 5FC0h
EDMA Base A 5FE0h
254
255
Parameter set 254
Parameter set 255
Parameter set 0
0
EDMA Base A 4000h
EDMA Base A 4040h
EDMA Base A 4060h
EDMA Base A 4020h
2
3
1
Parameter set 1
Parameter set 2
Parameter set 3
Byte
address
Set
#
PaRAM
PaRAM set 3
(a)
At initialization
(b)
After completion of PaRAM set 3
(link update)
Link
update
EDMA Base A 5FC0h 254
Parameter set 254
Parameter set 0
0
EDMA Base A 4000h
EDMA Base A 4040h
EDMA Base A 4060h
EDMA Base A 4020h
2
3
1
Parameter set 1
Parameter set 2
Parameter set 3
Byte
address
Set
#
PaRAM
CCNT X
SRCCIDX X
Link=5FE0h
SRCBIDX X
ACNT X
DSTCIDX X
Rsvd
BCNTRLD X
DSTBIDX X
BCNT X
DST X
SRC X
PaRAM set 3
OPT X
EDMA Base A 5FE0h 255
Parameter set 255
(c)
After completion of PaRAM set 127
(link to self)
OPT X
SRC X
BCNT X
ACNT X
DST X
SRCBIDX X
DSTBIDX X
Link=5FE0h
BCNTRLD X
CCNT X
SRCCIDX X
DSTCIDX X
Rsvd
OPT X
SRC X
BCNT X
ACNT X
DST X
SRCBIDX X
DSTBIDX Y
Link=5FE0h
BCNTRLD X
CCNT X
SRCCIDX X
DSTCIDX X
Rsvd
PaRAM set 255
CCNT X
SRCCIDX X
Link=5FE0h
SRCBIDX X
ACNT X
DSTCIDX X
Rsvd
BCNTRLD X
DSTBIDX X
BCNT X
DST X
SRC X
OPT X
Functional Description
Figure 11-12. Link-to-Self Transfer
11.3.4 Initiating a DMA Transfer
There are multiple ways to initiate a programmed data transfer using the EDMA3 channel controller.
Transfers on DMA channels are initiated by three sources.
They are listed as follows:
•
Event-triggered transfer request (this is the more typical usage of EDMA3): A peripheral, system, or
externally-generated event triggers a transfer request.
•
Manually-triggered transfer request:The CPU to manually triggers a transfer by writing a 1 to the
893
SPRUH73H – October 2011 – Revised April 2013
Enhanced Direct Memory Access (EDMA)
Copyright © 2011–2013, Texas Instruments Incorporated