AUGUST 1996
DS4585 - 1.6
VP7610
COLOUR DIGITAL VIDEO CAMERA DECODER IC
The VP7610 iCamHost™ Processor chip can decode
FEATURES
the signals from a variety of iVision™ compatible digital video
cameras (such as Silicon Vision’s iCam™) and process them
for use in a host computer system. Digital cameras can offer
realcostandperformancegainsinapplicationswhichrequire
a digital video input, and iVision technology realises both
these benefits. In a typical analog camera the digitised
output from the CCD imager is normally encoded into an
analog composite video signal which then has to be re-
digitised at the input to the host system. By employing the
iVisionapproachtheoutputfromthecameraismaintainedas
a digital signal, but in a format which allows for a low cost 9-
wire connection to the host. Eliminating the unnecessary
conversion to an analog signal and back again not only saves
cost, but also avoids any possible degradation of image
quality. Other benefits include direct control of the camera
from the host and the ability to power the camera from the
host system so saving the cost of a separate power supply.
TheVP7610supportstwosoftwareselectableCamPort™
interface ports, either of which can receive the digital video
from an iVision™ compatible digital video camera. The
output is a standard colour digital video signal, similar to
standard composite analog-digital decoder chips such as the
Philips SAA7110 and SAA7111. All iCamHost™ operating
modes are controlled by the host PC via an I2C interface.
Hardware I/O controls include output enable and I2C address
offset.
■ Accommodates different camera configurations based on
a variety of CCD imager resolutions
■ Requires only a small, low-cost 9 pin mini-DIN to connect
to camera
■ Receives the image signal from the camera in digital form
at a frame rate determined by the host
■ Decodes all necessary synchronization and clock signals
from the digital data stream
■ Programmable gamma correction curve in RGB
colourspace
■ Programmable colour-separation matrix
■ Collectsimagestatusdatawithinuser-definedrectangular
gated zone of CCD sensor
■ Programmable horizontal and vertical aperture correction
■ Pin-strap selectable output format in 16 bit YUV 4:2:2 or 8
bit CCIR 656 YUV 4:2:2
■ Test pattern generator for SMPTE colourbars
■ Bypass mode to output unprocessed 8 bit CCD pixel
samples in the luminance channel
■ Dual iCamPort™ camera input ports, software selectable
■ Completely iVision™ Compatible
NOTE: iCamTM, CamPort™ and iCamHost™ are
trademarks of Silicon Vision, Inc., Fremont, CA.
SYNC
& CLK
6
768
X 8 X 2
2H LINE
DELAY
FIFO RAM
C
M
Y
PORT A
5
COLOUR
MATRIX
CONVERTER
DEMUX
& SYNC
RECOVERY
G
RG B
RAM
CONTROL
PIXEL
SEPARATOR
ADDRESS
OFFSET
5
PORT
B
2
SERIAL BUS
CONTROLLER
2
I
C
FIELD &
COLOUR
FLAGS
CHROMINANCE
SUB-SAMPLING
& FILTERING
U V
CC IR6 01
or
GAMMA
CORRECTION
COLOUR SPACE
CONVERSION
OUTPUT
FORMATTER
1 6
or
8
CC IR6 56
Y
Y
OUTPUT
ENABLE
U V
CHROMINANCE
& LUMINANCE
METRICS
APERTURE
CORRECTION
Fig.1 Functional Block Diagram