VV6501 datasheet(14/60 Pages) STMICROELECTRONICS

14 / 60 page

Functional Description

VV6501

14/60

Start of frame line format

The start of frame line contains the contents of the first 16 serial interface registers rather than any

video data. This information immediately follows the line code at the beginning of the line. The code

07H is output after each serial interface value.

It takes 32 pixel clock periods to output these 16 serial interface register values. The remaining pixel

periods of the video portion of the line are padded out using 07H values. The first two pixel locations

are also padded with 07H characters (Figure 10). If a serial interface register location is unused then

the value from register 0 is output.

Following the escape sequence and line code at the end of active video, a frame count is output.

Active video line format

All video data is contained on active video lines. The pixel data appears as a continuous stream of

bytes within the active lines.

Black line format

The black lines contain information from the sensor black lines (held in zero exposure). This

information may be used by certain co-processors.

Dark line format

The dark lines contain information from the sensor dark lines (shielded from light by metal). The

information from these lines is used by the sensor to calculate a dark average offset value which is

then applied to the video data to ensure a known ‘black’ level for image data.

Blank line format

To reduce the frame rate it is possible to extend the frame length by adding blank data lines. These

contain no video or black line data. In default VGA mode there are no blank lines.

End of frame line format

The end of frame line sole purpose is to indicate the end of a frame, it contains no video data.

Figure 10: Start of frame line format

Start of Active Video

End of Active Video

Serial Interface Register Values

0H 1H

1H 9H

(SAV)

(EAV)

CH 7H

0H 7H

0H 7H 4H 0H

0H 7H

8H 0H

D1 D0

D3 D2

Frame

count

Line number 0

DeviceH (register 0)

DeviceL (register 1)

Padding characters

Start of frame

line codes

Data bus

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