Tiled Mode Addressing In 0° Or 180° Orientations, (S = 0); Tiled Mode Addressing In 90° Or 270° Orientations, (S = 1); Tiled Mode Container Characteristics - Texas Instruments TMS320C6A816 Series Technical Reference Manual

Architecture
Orientation
S Y
0 x
1 x
As a result, the coordinate (x0, y0) of a pixel in an oriented view is translated in a virtual address as
shown in Figure 2-29
Figure 2-29. Tiled Mode Addressing in 0° or 180° Orientations, (S = 0)
Bit 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
8-bit tiled mode
16-bit tiled mode
32-bit tiled mode
Figure 2-30. Tiled Mode Addressing in 90° or 270° Orientations, (S = 1)
Bit 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
8-bit tiled mode
16-bit tiled mode
32-bit tiled mode
Having understood the characteristic of the tiled container and the how the data is stored in bi-dimensional
manner, it is easy to understand how stride is calculated. Stride is calculated as the number bytes
between pixel (m,n) and pixel (m,(n+1)), where m = x co-ordinate of the image buffer, n = y co-ordinate of
the image buffer.
For S = 0, that is, all views with 0º and 180º:
• 8-bit mode: stride_8bitmode = 4 bytes per sub-tile × 1 byte height of a sub-tile line × 8 sub-tiles per tile
× 2 tiles per page × 256 pages = 4 × 1 × 8 × 2 × 256 = 16KB
• 16-bit mode: stride_16bitmode = 4 bytes per sub-tile × 2 bytes height of a sub-tile line × 8 sub-tiles per
tile × 2 tiles per page × 256 pages = 4 × 2 × 8 × 2 × 256 = 32KB
• 32-bit mode: stride_32bitmode = 4 bytes per sub-tile × 2 bytes height of a sub-tile line × 8 sub-tiles per
tile × 2 tiles per page × 256 pages = 4 × 2 × 8 × 2 × 256 = 32KB
For S = 1, that is, all views with 90º and 270º:
• 8-bit mode: stride_8bitmode = 4 bytes per sub-tile × 1 byte height of a sub-tile line × 8 sub-tiles per tile
× 2 tiles per page × 128 pages = 4 × 1 × 8 × 2 × 128 = 8KB
• 16-bit mode: stride_16bitmode = 4 bytes per sub-tile × 1 byte height of a sub-tile line × 8 sub-tiles per
tile × 2 tiles per page × 128 pages = 4 × 1 × 8 × 2 × 128 = 16KB
• 32-bit mode: stride_32bitmode = 4 bytes per sub-tile × 2 bytes height of a sub-tile line × 8 sub-tiles per
tile × 2 tiles per page × 128 pages = 4 × 2 × 8 × 2 × 128 = 16KB
360
DMM/TILER
Preliminary
Table 2-3. Tiled Mode Container Characteristics
Element Size
(bits)
X
8
x 16
32
8
x 16
32
and Figure 2-30, for all the four orientations.
y
0
y
0
y
0
y
0
y x
0 0
y
0
© 2011, Texas Instruments Incorporated
Width
Height
(eleme
(elements)
Progressive
nts)
16384 8192
16384 4096
8192 4096
8192 16384
4096 16384
4096 8192
9 8 7
x
0
x
0
9 8 7
x
0
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Stride (bytes)
Interlaced
16384 32768
32768 65536
32768 65536
8192 16384
8192 16384
16384 32768
6 5 4 3 2 1 0
x
0
6 5 4 3 2 1 0
x
0
x
0
SPRUGX9 – 15 April 2011