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CS7665/CS7666
Technical Brief
MIGRATING FROM THE CS7665 TO THE CS7666 OVERVIEW
The CS7666 forms the heart of a four chip digital CCD camera. The four chips include the CCD imager, a vertical drive interface chip for the CCD, the CS7615 CCD analog processor, and the CS7666 color space processor. Most four-phase CCD imagers (with their associated vertical drivers) can be used with an appropriate analog front end, such as the CS7615, and the CS7666 to form a simple and cost-effective digital camera. The CS7666, when used with the CS7615, supports imager formats from 175x175 pixels to over 1000x1000 pixels. The CS7666 provides all clocks necessary to drive the CS7615 and synchronizes itself to the CS7615 data stream by decoding the timing cues embedded in the CS7615 data stream. Alternately, the CS7666 accepts horizontal and vertical timing on pin inputs. The CS7666 acts as a limited bus master to program I2C slave devices using configuration data stored in an inexpensive external EEPROM. The CS7666 will read an optional I2C I/O port expander, such as the Philips PCF8574 or the CS4954, and select one of up to 8 configurations.
CS7666 NEW FEATURES
The CS7666 is a direct replacement for the CS7665. No board or software changes are needed for existing designs. However, slight changes to existing hardware and software are necessary to take advantage of the CS7666's enhancements
Color Kill
As a CCD nears saturation, the color information will become invalid. In the most general case, a white light will start to appear cyan. This effect is due to the four-color filter process and how the color processor removes the extra green from the CCD signal (adding the CYMG filter values generates 2R+3G+2B not R+G+B). To overcome this problem, the CS7666 compares every pixel to a set of programmable thresholds to determine if the pixel is close to saturation. If the pixel violates the thresholds, the color of the pixel is forced to white. This circuit may be turned off .
Auto-Boot Feature
For stand-alone operation the CS7666 can operate as a limited bus master for I2C like busses. When
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Feature scaler Autoboot Saturation control CS7665 4:5 1 configuration file electronic shutter CS7666 1:2,2:3,4:5,9:13,11:16,11:20,variable up to 8 selectable configurations electronic shutter, "color kill"
Table 1. Enhancements
For further information, please contact Cirrus Logic's Crystal(R) Product Support at (512) 445-7222 or 1 (800) 888-5016
Cirrus Logic, Inc. Crystal Semiconductor Products Division P.O. Box 17847, Austin, Texas 78760 (512) 445 7222 FAX: (512) 445 7581 http://www.crystal.com
Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved)
JAN `99 DS302TB1 1
CS7665/CS7666
the CS7666 is taken out of reset, it will load configuration data stored in an external serial EEPROM into any IC connected to the CS7666 through one of its two I2C compatible serial control ports. Unlike the CS7665, the CS7666 has the ability to select one of several configurations stored in the EEPROM. After reset, the CS7666 will read the state of an external I/O port (such as the CS4954 GPIO port or the Philips SAA8574) and determine which 1 of 8 possible configuration settings will be used. The CS7666 adds new instructions to allow multiple configurations to share common data, such as gamma tables, to reduce the total amount of required EEPROM space. Like the CS7665, the CS7666 can address up to 16K bits of external EEScaler Mode 000 001 010 011 100 101 110 111 CCD Format up to 1Kx1K 512x480 512x480 512x576 362x480 362x480(576) 512x576 512x576
PROM. Also, the CS7666 will use existing CS7665 EEPROM files without modification.
Image Scaling
The CS7666 provides enhanced scaling features not found in the CS7665. The CS7666 contains a programmable PLL and linear interpolation filter. The CS7666 was designed to produce square-pixel and rectangular-pixel formats for common video encoders while using inexpensive 512 pixel per line or 362 pixel per line imagers. Eight common scaling modes are easily selectable from one register, but the user may also program the PLL/Scaler with a general M/N value(M,N < 32). The PLL may be bypassed, if desired, to provide non-scaled video output.
Output Format same as source 640x480 720x480 720x576 640x480 640x480,720x480(576) 720x480(576) 720x576 Scaling Ratio 1:1 5:4 13:9 16:11 20:11 2:1 24:17 3:2
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DS302TB1

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