VD6640 datasheet(85/126 Pages) STMICROELECTRONICS

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VG6640, VD6640

Test pattern generation

125

Test pattern generation

The VG6640 sensor contains a test pattern generator that can inject deterministic test

patterns into the pixel data path. The test patterns are injected independently into the long,

medium and short exposure data paths before they are merged together. Because of this

the test patterns can be used to test the correctness of the entire video system on the

VG6640. However, it also means that the video pipe of the VG6640 must be correctly

configured to give the expected output of the test patterns.

The test pattern generator block can operate in one of three modes, determined by the

TestPatternMode field of the TestPatternControl register

Standard mode. Full frame test pattern determined by the TestPatternSelect field.

Digital ASIL mode. HDR ramp outputted on the digital ASIL lines that immediately

follow the active image lines. This is the default mode for VG6640.

HDR ramp mode. A hdr grey scale ramp is outputted across a programmable

number of lines of the image. Ramp characteristics are determined by the settings

in the “HDRPattern_xxxxxxx” registers.

Note:

Changes to the TestPatternControl register only take affect during a transition from

STANDBY to STREAMING state.

8.1

Standard mode patterns

The selection of the test pattern type is done with the TestPatternSelect field of the

TestPatternControl register. Test patterns available are as follows.

Table 38. Test pattern types

TestPatternSelect

Name

Description

None

No test pattern outputted.

1Solid color

Solid color. Programmable value for Bayer

pixels on long, medium and short data paths.

100% color bars

Color bar pattern (see Section 8.1.1)

Fade to grey color bars

Color bars that fade to grey towards the bottom

of image (see Section 8.1.2).

Horizontal grey scale

Horizontal grey scale ramp across the image.

Vertical grey scale

Vertical grey scale ramp down the image.

Diagonal grey scale

Diagonal grey scale ramp.

PN28 pseudo-random

Pseudo-random series of pixel values.

Smearing test

Injects a rectangular area of solid color pixels

while passing through normal image pixels for

the rest of the image.

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