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TV SCALER
As explained in the previous section, SRC_Width and DST_Width satisfies the word boundary constraints such
that the number of horizontal pixel can be represented by kn where n = 1,2,3, ... and k = 1 / 2 / 8 for 24bppRGB /
16bppRGB / YCbCr420 image, respectively. Also SRC_Width must be 4's multiple of PreScale_H_Ratio and
SRC_Height must be multiple of PreScale_V_Ratio.
SRC_Width
Source Image
The other control registers of pre-scaled image size, pre-scale ratio, pre-scale shift ratio and main scale ratio
are defined according to the following equations.
If ( SRC_Width >= 64 × DST_Width ) { Exit(-1); /* Out Of Horizontal Scale Range */ }
else if (SRC_Width >= 32 × DST_Width) { PreScale_H_Ratio = 32; H_Shift = 5; }
else if (SRC_Width >= 16 × DST_Width) { PreScale_H_Ratio = 16; H_Shift = 4; }
else if (SRC_Width >= 8 × DST_Width) { PreScale_H_Ratio = 8; H_Shift = 3; }
else if (SRC_Width >= 4 × DST_Width) { PreScale_H_Ratio = 4; H_Shift = 2; }
else if (SRC_Width >= 2 × DST_Width) { PreScale_H_Ratio = 2; H_Shift = 1; }
else { PreScale_H_Ratio = 1; H_Shift = 0; }
PreScale_DSTWidth = SRC_Width / PreScale_H_Ratio;
dx = ( SRC_Width << 8 ) / ( DST_Width << H_Shift);
If ( SRC_Height >= 64 × DST_Height ) { Exit(-1); /* Out Of Vertical Scale Range */ }
Preliminary product information describe products that are in development,
16-8
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
Figure 16-5 Source destination image size Block Diagram
S3C6400X RISC MICROPROCESSOR
DST_Width
Destination Image
서식
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