VX6854LC datasheet(55/114 Pages) STMICROELECTRONICS

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VX6854LC

Video timing

6.1

Output size

The VX6854LC has the following methods available to achieve the required output size,

these can be used independently or in conjunction with any other:

•

programmable addressable region of the pixel array

•

programmable width and height for output image data

•

scaling

•

subsampling

The programmable image size and output size are independent functions. It is the

responsibility of the host to ensure that these functions are programmed correctly for the

intended application. These functions also reduce the amount of data and therefore reduce

the peak data rate of CCP2/CSI-2.

6.1.1

Programmable addressable region of the pixel array

The native size for the VX6854LC is 2048 x 1536, the maximum addressable array is 2064

x 1552 which gives border (outer 8 rows and 8 columns) pixels for the color reconstruction

algorithms to use at the edges of the array.

By programming the x_addr_start, y_addr_start, x_addr_end and y_addr_end registers it is

possible to use the full size of the array as you would do for a native size output or you can

select a “window of interest”. The addressed region of the array is used in any subsequent

sub-sampling or scaling.

Figure 14. Programmable addressable region of the pixel array

y_addr_max =1551

x_addr_max =2063

y_addr_min = 0

x_addr_min = 0

x_addr_max, y_addr_max

x_addr_end, y_addr_end

Addressed

pixel array region

x_addr_start, y_addr_start

x_addr_min, y_addr_min

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