Chapter 10 Memory Subsystem.pdf

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(1) (2)
Table 10-107. Calculating Image Size
Steps RGB16 Format (16-Bit Pixel Format) YUV Format (32-Bit Pixel Format)
IMAGEWIDTH IMAGEHEIGHT IMAGEWIDTH IMAGEHEIGHT
1 Calculate the required 240 pixels/32 bytes * 2 240/32 rows = 7.5, 120 pixels/32 bytes 240/32 rows = 7.5,
number of pages per line bytes per pixel = 15 rounded to 8 pages per * 4 bytes per pixel rounded to 8
and per column. pages per line column format = 15
2 Using the number of 15 * 32 bytes/2 bytes 8 * 32 rows = 256 I5 * 32 bytes/4 bytes 256
pages calculated in Step per pixel = 240 per pixel format =
1, calculate the image 120
size in pixels.
(1) Working on a page basis, the image size must be a multiple of the page size.
(2) Depending on the page dimensions and the image size, the programmed image size (256) is larger than the actual image size
(240).
To use VRFB rotation, each initiator must configure its DMA engine correctly; an additional offset to the
base address may be required. For details, see Chapter 7, Display Subsystem.
10.2.6.1.3 Applicative Use Case and Tips
Use Case Scenario: Display a Rotated QVGA Image
Figure 10-66 shows the use case for displaying a rotated QVGA image. The camera captures an image
with a particular rotation and stores the pixel data in external memory. Displaying the image on the DSS
requires a different orientation.
2264 Memory Subsystem SPRUGN4L–May 2010–Revised June 2011
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