OV7620 datasheet(35/60 Pages) ETC

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OV7620 Product Specifications - Rev. 1.2 (5/13/00)

OMNIVISION TECHNOLOGIES INC.

Preliminary Company Confidential

As shown above, HS<7:0> defines the starting pixel within a scan line, HE<7:0> defines the ending pixel

within a scan line. VS<7:0> defines the starting row within a field, VE<7:0> defines the ending

row within a field. VS/VE automatically defines the window height of a image frame. The rect-

angular window defined by HS/HE/VS/VE is the active image window. Only pixels insides this

window is valid, along with the HREF timing signals, black level substitutes the pixel data

when outside the active window.

Identical value for HS/HE or VS/VE is not permitted since it causes undefined window size.

If end point is lower than the starting point, the window begins from the starting point and ends at the far

end of the available image boundary.

The window size calculate formula is as below:

1. Horizontal size: VGA mode: Horizontal window size = (Register [18] - Register [17])*4.

QVGA mode: Horizontal window size = (Register [18] - Register [17])*2.

2. Vertical size: VGA mode: Vertical window size = (Register [1A]- Register [19]+1);

QVGA mode: Horizontal window size = (Register [1A] - Register [19]+ 1).

FULL image boundary

Active Window

FIG 1.11 Window Sizing

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