VX6953CB datasheet(52/107 Pages) STMICROELECTRONICS

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Video timing

VX6953CB

52/107

8209023 Rev 5

6.1.2

Programmable width and height for output image data

The x_output_size and y_output_size registers are not intended as the primary cropping

controls.

They are intended to define the position of the LE/FE codes in the CCP data frame so that

the sensor does not need to calculate this based on region of interest or sub-sampling

settings. It should be expected that the host will set the output sizes to exactly enclose the

output image data. If the host should not do this, the VX6953CB treats the output sizes as

being calculated from the top left hand corner of the output array. So in the case where

output sizes are smaller than the output data, the data is cropped from its right hand and

lower limits. In the case where output sizes are larger than the output data, the lines shall be

padded out to the defined output size with undefined data.

Figure 15. Output size within a CCP data frame

CCP2 requires that the number of pixels between the line start and the line end sync codes

is:

•

a multiple of 4 pixels for RAW8

•

a multiple of 16 pixels for RAW10

The host must control the x_output_size to ensure that the above criteria is met.

6.1.3

Scaling

The VX6953CB module is compliant with the ‘Profile Level 2 - Full (Horizontal and Vertical)’

level of image scaling.

The image scaling function within the sensor module provides a flexible way of generating

lower resolution full field of view image data, at a reduced data rates, for viewfinder and

video applications.

The scaler is able to scale the full resolution of the sensor module down to within 10% of a

the target image size (the smallest output size is 256 x 192). This flexibility means that the

VX6953CB module can support a wide range of LCD viewfinder sizes and different codec

resolutions.

The VX6953CB has three scaling modes which are controlled by the scaling_mode register

shown in Figure 16.

CCP output active line length

Interframe padding

x_output_size

Output data

Embedded data lines

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