Double-Indexed Addressing Mode Memory Accesses - Texas Instruments OMAP5912 Reference Manual

System DMA
Figure 8.

Double-Indexed Addressing Mode Memory Accesses

Element n
Frame m
Element n+1
Element n+2
Frame m+1
Element n+3
50 Direct Memory Access (DMA) Support
Figure 8 illustrates how the memory accesses are performed if an LCh is
configured with double-indexed addressing mode and:
Starting address: 00
-
Element size: 2 (16 bits)
-
Element number: 2
-
Element index: 3
-
Frame number: 2
-
Frame index: 5
-
Memory
Byte @ addr 00
Byte @ 01
Byte @ 02
Byte @ 03
Byte @ 04
Byte @ 05
Byte @ 06
Byte @ 07
Byte @ 08
Byte @ 09
Byte @ 0A
Byte @ 0B
Byte @ 0C
Byte @ 0D
Byte @ 0E
Byte @ 0F
Byte @ 10
Byte @ 11
Element size (can be 1, 2, 4)
Element Index (must be seen as @
increment)
(El =3, size = 2)
Stride Fl = 3 elements.
Frame Index (must be seen @
Increment)
(Fl = 5, index size = 4)
(Index size can be different
from frame size.)
Stride El = 2 elements.
Block (full data transfer, BSi)
SPRU755B