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CX25870 参数 Datasheet PDF下载

CX25870图片预览
型号: CX25870
PDF下载: 下载PDF文件 查看货源
内容描述: 视频编码器与自适应闪烁过滤和HDTV输出 [Video Encoder with Adaptive Flicker Filtering and HDTV Output]
分类和应用: 电视编码器
文件页数/大小: 291 页 / 3791 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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1.0 Functional Description  
CX25870/871  
1.3 Device Description  
Flicker-Free Video Encoder with Ultrascale Technology  
1.3.11 Input Pixel Timing  
The device can accept the input data in either RGB or YCrCb color spaces. Data  
can be input either a full pixel at a time clocked in on the rising edge of CLKI  
only, or in various multiplexed modes, using both edges of CLKI.  
In YCrCb format, either 24-bit 4:4:4 data or 16-bit 4:2:2 data can be input. In  
RGB format, either 15-bit 5:5:5, 16 bit 5:6:5, or 24-bit RGB can be input. In  
16-bit 4:2:2 YCrCb input format, multiplexed Y, Cr, and Cb data is input through  
the P[11:4] or P[7:0]input pins. The Y data is input on the falling edge of CLKI.  
The Cr/Cb data is input on the rising edge of CLKI. The Cb/Y/Cr/Y sequence  
begins at the first active pixel. An additional 4:2:2 YCrCb input format maps Y to  
P[19:12] and Cr/Cb multiplexed on P[11:4]. In 24-bit 4:4:4 YCrCb input format,  
multiplexed Y, Cr, and Cb data is input through the P[11:0] inputs. Both the rising  
and falling edge of CLKI sample the input data.  
In RGB input format, input data is sampled as 12 bits at a time in 24-bit RGB  
format or 8 bits at a time in 15/16 bit RGB format on both the rising and falling  
edge of CLKI. Table 1-2 shows the data pin assignments for all available  
multiplexed input formats.  
In addition, all 24-bit formats, a 16-bit RGB format, and a 16-bit YCrCb  
format can utilize the nonmultiplexed clocking method. See Table 1-3 for these  
pin-to-bit assignments.  
1.3.12 YCrCb Inputs (For Standard TV Outputs)  
Y has a nominal range of 16–235; Cr and Cb have a nominal range of 16–240,  
with 128 (80 hex) equal to zero. Values of 0 and 255 are interpreted as 1 and 254,  
respectively. Y values of 1–15 and 236–254, and CrCb values of 1–15 and  
241–254, are interpreted as valid linear values.  
1-28  
Conexant  
100381B  
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