LM9617 datasheet(12/37 Pages) NSC

12 / 37 page

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Functional Description (continued)

4.0

SUBSAMPLING MODES

4.1

2:1 Sub-Sampling

The timing and control circuit can be programmed to sub-sam-

ple pixels in the display window vertically, horizontally or both,

with an aspect ratio of 2:1 as illustrated in Figure16

Column/Horizontal

a b c d e f g h i

j k l

l n o p q r

a b c d e f g h i

k l m n o p

b) Vertical Sub-Sampling

Column/Horizontal

q r

a b c d e f g h i

j k l m n o p q r

Column/Horizontal

a) Horizontal Sub-Sampling

c) Horizontal & Vertical Sub-Sampling

Read Out

Not Read Out

Figure 16: 2:1 Horizontal and Vertical Sub-Sampling

4.2

4:2 Sub-Sampling

The timing and control circuit can be programmed to sub-sam-

ple pixels in the display window vertically, horizontally or both,

with an aspect ratio of 4:2 as illustrated in Figure17.

Column/Horizontal

a) Horizontal Sub-sampling

Read Out

Not Read Out

a b c d e f g h i

j k l m n o p q r

a b c d e f g h i

j k l m n o p q r

Column/Horizontal

a b c d e f g h i

j k l m n o p q r

Column/Horizontal

c) Horizontal & Vertical Sub-sampling

b) Vertical Sub-sampling

Figure 17: 4:2 Horizontal and Vertical Sub-Sampling

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