Texas Instruments AM335 Series Technical Reference Manual

Parameter set 0
PaRAM
Set
#
Byte
address
0EDMA Base Address + 4000h
EDMA Base Address + 4020h 1 Parameter set 1
EDMA Base Address + 4040h 2 Parameter set 2
EDMA Base Address + 4060h 3 Parameter set 3
EDMA Base Address + 5FC0h
EDMA Base Address + 5FE0h
254
255 Parameter set 255
Parameter set 254
OPT X
SRC X
BCNT X ACNT X
DST X
SRCBIDX XDSTBIDX X
Link=5FE0hBCNTRLD X
CCNT X
SRCCIDX XDSTCIDX X
Rsvd
PaRAM set 3
PaRAM set 255
EDMA Base Address + 5FC0h
EDMA Base Address + 5FE0h
254
255
Parameter set 254
Parameter set 255
Parameter set 00EDMA Base Address + 4000h
EDMA Base Address + 4040h
EDMA Base Address + 4060h
EDMA Base Address + 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 Address + 5FC0h 254 Parameter set 254
Parameter set 00EDMA Base Address + 4000h
EDMA Base Address + 4040h
EDMA Base Address + 4060h
EDMA Base Address + 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 Address + 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 XDSTBIDX X
Link=5FE0hBCNTRLD X
CCNT X
SRCCIDX XDSTCIDX X
Rsvd
OPT X
SRC X
BCNT X ACNT X
DST X
SRCBIDX XDSTBIDX Y
Link=5FE0hBCNTRLD X
CCNT X
SRCCIDX XDSTCIDX 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
www.ti.com 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)
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Texas Instruments AM335 Series Specifications

General

Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English