Texas Instruments AM335 Series Technical Reference Manual

A_1022 A_1023 A_1024
B_1023B_1022 B_1024
D_1023
C_1023
D_1022
C_1022
D_1024
C_1024
...
...
... ...
...
...
...
...
D_2D_1 D_3
C_2
B_2
A_2
C_1
B_1
A_1
B_3
C_3
A_3
Channel Source
Address (SRC)
D_1
D_2
D_1023
...
D_3
...
D_1022
D_1024
B_1 C_1A_1
B_2 C_2A_2
C_1023B_1023
A_1023
...
...
...
B_3 C_3A_3
...
...
...
C_1022B_1022A_1022
B_1024 C_1024A_1024
Channel
Destination
Address (DST)
Functional Description www.ti.com
(b) Channel Options Parameter (OPT) Content
31 30 28 27 24 23 22 21 20 19 18 17 16
0 000 0000 0 0 0 1 00 00
PRIV Reserved PRIVID ITCCHEN TCCHEN ITCINTEN TCINTEN Reserved TCC
15 12 11 10 8 7 4 3 2 1 0
0000 0 000 0000 1 1 0 0
TCC TCCMOD FWID Reserved STATIC SYNCDIM DAM SAM
11.3.19.3 Data Sorting Example
Many applications require the use of multiple data arrays; it is often desirable to have the arrays arranged
such that the first elements of each array are adjacent, the second elements are adjacent, and so on.
Often this is not how the data is presented to the device. Either data is transferred via a peripheral with
the data arrays arriving one after the other or the arrays are located in memory with each array occupying
a portion of contiguous memory spaces. For these instances, the EDMA3 can reorganize the data into the
desired format. Figure 11-26 shows the data sorting.
To determine the parameter set values, the following need to be considered:
• ACNT - Program this to be the size in bytes of an element.
• BCNT - Program this to be the number of elements in a frame.
• CCNT - Program this to be the number of frames.
• SRCBIDX - Program this to be the size of the element or ACNT.
• DSTBIDX - CCNT × ACNT
• SRCCDX - ACNT × BCNT
• DSTCIDX - ACNT
The synchronization type needs to be AB-synchronized and the STATIC bit is 0 to allow updates to the
parameter set. It is advised to use normal EDMA3 channels for sorting.
It is not possible to sort this with a single trigger event. Instead, the channel can be programmed to be
chained to itself. After BCNT elements get sorted, intermediate chaining could be used to trigger the
channel again causing the transfer of the next BCNT elements and so on. Figure 11-27 shows the
parameter set programming for this transfer, assuming channel 0 and an element size of 4 bytes.
Figure 11-26. Data Sorting Example
922
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