Texas Instruments AM335 Series Technical Reference Manual

00 0000 0000 0000 0000
31 1314
PAENTRY
45 02 1
TR WORD
00
QCHMAPn
Parameter set 0
Parameter set 1
Parameter set 3
Parameter set 2
Parameter set 255
Parameter set 254
Set
#
Byte
address
EDMA Base Address 4000h
EDMA Base Address 5FE0h
0
1
2
3
254
255
DSTBIDX
BCNTRLD
Reserved
DSTCIDX
CCNT
SRCCIDX
LINK
SRCBIDX
DST
BCNT ACNT
SRC
OPT
PaRAM PaRAM set
+0h
+4h
+8h
+Ch
Byte
address
+1Ch
+18h
+14h
+10h
00 0000 0000 0000 0000
31 1314
PAENTRY
45 0
00000
DCHMAPn
offset
EDMA Base Address 4020h
EDMA Base Address 4040h
EDMA Base Address 4060h
EDMA Base Address 5FC0h
Functional Description www.ti.com
Figure 11-13. DMA Channel and QDMA Channel to PaRAM Mapping
11.3.6.2 QDMA Channel to PaRAM Mapping
The mapping between the QDMA channels and the PaRAM sets is programmable. The QDMA channel
mapping register (QCHMAP) in the EDMA3CC allows you to map the QDMA channels to any of the
PaRAM sets in the PaRAM memory map. Figure 11-14 illustrates the use of QCHMAP.
Additionally, QCHMAP allows you to program the trigger word in the PaRAM set for the QDMA channel. A
trigger word is one of the eight words in the PaRAM set. For a QDMA transfer to occur, a valid TR
synchronization event for EDMA3CC is a write to the trigger word in the PaRAM set pointed to by
QCHMAP for a particular QDMA channel. By default, QDMA channels are mapped to PaRAM set 0. You
must appropriately re-map PaRAM set 0 before you use it.
898
Enhanced Direct Memory Access (EDMA) SPRUH73H–October 2011–Revised April 2013
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Texas Instruments AM335 Series Specifications

General

Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English