CS7666 datasheet(37/42 Pages) CIRRUS

37 / 42 page

CS7666

DS302PP1

CLKOUT - Digital Output Data Clock, PIN 59.

Digital output clock for both channel "A" and channel "B." Output data transitions on the

falling edge of CLKOUT and can be latched on the rising edge. In the non-interleaved output

mode, the CLKOUT rate is equal to the input mosaic pixel rate multiplied by the scaling ratio

currently in use with Y data available on channel "A" and CrCb output data on Channel "B." In

interleaved output mode, the CLKOUT rate is equal to twice the input mosaic pixel rate

multiplied by the current scaling ratio with Y and CrCb output data available on Channel "A".

INTERP - Digital Video Horizontal Data Rate Scaler Enable, PIN 54.

CMOS input enabling the internal 4:5 horizontal data rate scaler when the CS7666 is in

CS7665 compatibility mode (default.) Requires that CLKIN2 be supplied with a 5/2 rate clock

relative to the CLKIN clock input which is the incoming CCD mosaic data. This pin control is

active logic high. This pin is ignored in CS7666 native mode.

HREFOUT - Horizontal Reference Output, PIN 30.

CMOS output providing HREF, or alternatively HSYNC horizontal blanking signal.

VREFOUT - Vertical Reference Output, PIN 31.

CMOS output providing a VREF, or alternatively VSYNC vertical blanking signal.

FIELD - Odd/Even Field Indicator, PIN 62.

CMOS input/output. As an input, the field pin synchronizes the EAV/SAV timing codes

embedded in the output video datastream. As an output, the FIELD indicator changes according

to the embedded EAV/SAV timing codes in the input video datastream or the HREFIN and

VREFIN inputs. Odd fields are indicated with logic low, and even fields are indicated with

logic high. Alternately, the Field pin can be configured as a U/V clock.

OE - Output Enable, PIN 63.

CMOS input used to place all output pins in a High-Z mode. This control works in conjunction

with the OE bit (bit 3)in register 06h.

Output Mode

Mosaic

Data Rate

CLKIN

CLKIN2

Channel

“A”

Channel

"B”

CLKOUT Horizontal

Pixels

Interleaved, scaler disabled

9.818 MHz 9.818 MHz 19.63 MHz

YcrCb

logic "0” 19.63 MHz

512

Interleaved, scaler enabled

9.818 MHz 9.818 MHz 24.54 MHz

YcrCb

logic "0” 24.54 MHz

640

Parallel, scaler disabled

9.818 MHz 9.818 MHz 19.63 MHz

CrCb

9.818 MHz

512

Parallel, scaler enabled

9.818 MHz 9.818 MHz 24.54 MHz

CrCb

12.27 MHz

640

Table 16. Example 512x492 Imager Output Options

(4:5 scaling ratio chosen)

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