8

Proprietary to OmniVision Technologies

Version 1.3, January 15, 2003

OV7640/OV7140

CMOS VGA (640 x 480) CAMERACHIP™

Omni ision

Figure 6 VGA Frame Timing Diagram

Figure 7 QVGA Frame Timing Diagram

Note: As the RGB, YUV and YCbCr formats use the Bayer pattern for interpolation, the first row transferred out on the Y[7:0]

bus will be invalid, as there is no row above Row #1 to provide the 'pair data' required. Because of this, the OV7640

does not enable the HREF signal during the first row read (shown above in the 'invalid data' zone).

VSYNC

Y[7:0]

HREF

525 t

ROW

3 t

ROW

11 t

ROW

762 t

PCLK

640 t

PCLK

(Invalid Data)

Row 1

Row 2

Last Row

Row 0

122 t

PCLK

31 t

ROW

(Invalid Data)

VSYNC

Y[7:0]

HREF

262.5 t

ROW

3 t

ROW

9 t

ROW

381 t

PCLK

320 t

PCLK

(Invalid Data)

Row 1

Row 2

Last Row

Row 0

61 t

PCLK

10.5 t

ROW

(Invalid Data)