CS7666 datasheet(7/42 Pages) CIRRUS

7 / 42 page

CS7666

DS302PP1

mon target resolutions for the scaler are 640 and

720 pixels per line (square and rectangular pixel

formats), but it is possible to provide generic scal-

ing of M/N where M and N are values from 1 to 31.

The CS7615 and CS7666 chip set supports a wide

range of imager formats while providing an output

format that follows the ITU-601 Component Digi-

tal Video recommendation. The ITU-601 docu-

ment primarily specifies horizontal resolutions of

720 active horizontal pixels (which is required for

broadcast

television

compatibility).

However,

many of today’s digital video receivers are capable

of operating with a wide range of video image for-

mats. Even though these digital video receivers al-

low image formats not specified in the ITU-

601/656 recommendation, all of these receivers ex-

pect the basic ITU-601/656 protocol to be followed

in terms of data sequence and timing cues. This is

the case with the CS7666, where all output formats

follow the ITU-601/656 recommendation even if

the image formats differ in horizontal and vertical

pixel dimensions.

The 640 Pixel Horizontal Line

The following discussion assumes that a 512 hori-

zontal pixel class imager has been selected for the

camera, the CS7615 has been programmed to pro-

vide 512 active pixels and 112 inactive pixels, and

that the internal 4:5 horizontal scaler has been en-

abled (scaler mode 1). Many other imager/scaler

combinations are possible, but the digital video for-

mat would not be significantly different than the

640x480 case described.

Transmitted during each active line are 1280 mul-

tiplexed luminance and chrominance values (640

luminance, 320 chrominance Cr, and 320 chromi-

nance Cb values). Eight of the remaining 280 inter-

face

clock

intervals

are

used

transmit

synchronizing information. The first of these 1560

interface clock intervals is designated line 0 word 0

for the purpose of reference only. The 1560 sample

words per total line are therefore numbered 0

through 1559. Intervals 0 through 1279, inclusive,

contain video data.

The interface clock intervals occurring during dig-

ital blanking are designated 1280 through 1559. In-

tervals 1280 through 1283 are reserved for the end-

active-video (EAV) timing reference. Intervals

1556 through 1559 are reserved for the start-of-ac-

tive-video (SAV) timing reference. Figure 3 indi-

cates the values of the timing reference signals (F,

V, H) for an entire frame of interlaced video. Please

note the scan lines are numbered 1 through 525

consecutively in the time domain (spatially they are

interlaced). Table 1 defines the 1560 samples of a

single scan line of video.

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