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CS7666-KQ Arkusz danych(PDF) 7 Page - Cirrus Logic |
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CS7666-KQ Arkusz danych(HTML) 7 Page - Cirrus Logic |
7 / 42 page CS7666 DS302PP1 7 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 to 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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