Functional Description
Note that PaRAM updates only pertain to the information that is needed to properly submit the next
transfer request to the EDMA3TC. Updates that occur while data is moved within a transfer request are
tracked within the transfer controller, and is detailed in
. For A-synchronized transfers, the
EDMA3CC always submits a TRP for ACNT bytes (BCNT = 1 and CCNT = 1). For AB-synchronized
transfers, the EDMA3CC always submits a TRP for ACNT bytes of BCNT arrays (CCNT = 1). The
EDMA3TC is responsible for updating source and destination addresses within the array based on ACNT
and FWID (in OPT). For AB-synchronized transfers, the EDMA3TC is also responsible to update source
and destination addresses between arrays based on SRCBIDX and DSTBIDX.
shows the details of parameter updates that occur within EDMA3CC for A-synchronized and
AB-synchronized transfers.
Table 11-9. Parameter Updates in EDMA3CC (for Non-Null, Non-Dummy PaRAM Set)
A-Synchronized Transfer
AB-Synchronized Transfer
B-Update
C-Update
Link Update
B-Update
C-Update
Link Update
BCNT == 1 &&
BCNT == 1 &&
Condition:
BCNT > 1
CCNT > 1
CCNT == 1
N/A
CCNT > 1
CCNT == 1
SRC
+= SRCBIDX
+= SRCCIDX
= Link.SRC
in EDMA3TC
+= SRCCIDX
= Link.SRC
DST
+= DSTBIDX
+= DSTCIDX
= Link.DST
in EDMA3TC
+= DSTCIDX
= Link.DST
ACNT
None
None
= Link.ACNT
None
None
= Link.ACNT
BCNT
–= 1
= BCNTRLD
= Link.BCNT
in EDMA3TC
N/A
= Link.BCNT
CCNT
None
–= 1
= Link.CCNT
in EDMA3TC
–=1
= Link.CCNT
SRCBIDX
None
None
= Link.SRCBIDX
in EDMA3TC
None
= Link.SRCBIDX
DSTBIDX
None
None
= Link.DSTBIDX
None
None
= Link.DSTBIDX
SRCCIDX
None
None
= Link.SRCBIDX
in EDMA3TC
None
= Link.SRCBIDX
DSTCIDX
None
None
= Link.DSTBIDX
None
None
= Link.DSTBIDX
LINK
None
None
= Link.LINK
None
None
= Link.LINK
BCNTRLD
None
None
= Link.BCNTRLD
None
None
= Link.BCNTRLD
OPT
(1)
None
None
= LINK.OPT
None
None
= LINK.OPT
(1)
In all cases, no updates occur if OPT.STATIC == 1 for the current PaRAM set.
NOTE:
The EDMA3CC includes no special hardware to detect when an indexed address update
calculation overflows/underflows. The address update will wrap across boundaries as
programmed by the user. You should ensure that no transfer is allowed to cross internal port
boundaries between peripherals. A single TR must target a single source/destination slave
endpoint.
890
Enhanced Direct Memory Access (EDMA)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated