VG6640 datasheet(73/126 Pages) STMICROELECTRONICS

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VG6640, VD6640

Video timing

125

The host must ensure that the following frame timings are respected:

•

frame_length_lines limits = (264 + 12datalines + 31minimum blanking) min, 65536 max.

•

line_length_pck limits = 1438 min, 65536 max.

•

x_start_addr limits = 0 min, 1039 (1303 - 264) max,

•

y_start_addr limits = 0 min, 715 (979 - 264) max.

•

x_op_size limits = 264min, 1304 max.

•

y_op_size limits = 264min, 980 max.

6.2

Sub-sampled readout mode

Subsampling may be enabled by programming the x_odd_inc, y_odd_inc, x_even_inc and

y_even_inc registers.

If the pixel being readout has an even address then the address is incremented by the even

increment value, either x_even_inc or y_even_inc. If the pixel being readout has an odd

address then the address is incremented by the odd increment value, either x_odd_inc or

y_odd_inc.

Subsampling acts upon the addressed region of the array which is determined by the

x_addr_start, y_addr_start, x_addr_end and y_addr_end registers.

The host must ensure that the following limits are respected:

•

x_odd_inc limits = 1 min, 15 max

•

x_even_inc limits = 1 min, 15 max

•

y_odd_inc limits = 1 min, 15 max, only odd values (1,3,5, etc) supported

•

y_even_in limits = 1 min, 15 max, only odd values (1,3,5, etc) supported

The subsampling factor may be calculated as follows:

Table 33. Typical subsampling settings

Subsampling

x_odd_inc

y_odd_inc

x_even_inc

y_even_inc

Disabled

Bayer 2 x 2

Bayer 2 x 4

Bayer 4 x 4

sub_sampling_factor

even_inc odd_inc

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