VV0670P001 View Datasheet(PDF) - Vision

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Description

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VV0670P001

Colour Processor Interface ASIC

Vision 

Colour Processor Interface ASIC

2 CPiA Functional Description

2.1 Video Processor Module

The CPiA video processor module provides CIF-format 4:2:2-sampled digital video to the VC module at frame

rates up to 30 frames per second and also interfaces directly to the 356 x 292 pixel colour CMOS image sensor

provided in Vision’s VM6404 camera head module. Using a 9-wire cable and an absolute minimum of external

components, the interface incorporates:

1. A 4-wire data bus SDATA[3:0] for receiving both video data and embedded timing references.

2. A 2-wire serial interface SSDA,SSCL for controlling the camera.

3. The clock for camera module SCLK.

4. 5V and 0V power lines. CPiA is not required to provide power directly to the camera; camera power is

derived from the system power supply.

The simplified block diagram shown below highlights the key functional blocks within CPiA’s VP module.

SCLK

CLOCK &

CONTROL

SDATA[3:0]

MONITORS

COLOUR VIDEO

ENGINE

SSDA

SSCL

SERIAL

INTER-

FACE

PIXEL DEFECT

CORRECTION

Block Diagram of CPiA Video Processor Module

CPiA provides a master clock SCLK to the camera module. Each 8-bit pixel value generated by the camera is

transmitted across the 4 wire databus SDATA[3:0] as a pair of sequential 4-bit nibbles, most significant nibble

first. Codes representing the start and end frames and the start and end of lines are embedded within the video

pixel data stream to allow the receiver to synchronise with the video data which the camera module is

generating.

The video processing engine performs these basic functions on incoming data: full colour restoration at each

pixel site from Bayer-patterned input data, matrixing/gain on each colour channel for colour purity, aperture

correction for image clarity, gamma correction, and colour space conversion (including hue and saturation

control) from RGB to YCbCr.

Image statistic monitors gather data required by the CP module for end-of-frame housekeeping tasks such as

exposure control and colour balance.

The 2-wire camera serial interface provides complete control over how the sensor is setup and run.

V:\apps\cpia\docs\cpia datasheet\cpia_datasheet4.fm

02/07/98

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