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MSM7653 Datasheet(PDF) 10 Page - OKI electronic componets |
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MSM7653 Datasheet(HTML) 10 Page - OKI electronic componets |
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10 / 36 page  ¡ Semiconductor MSM7653 10/35 BLOCK FUNCTIONAL DESCRIPTION 1. Prologue Block This block separates input data at the ITU Rec.656 format into a luminance signal (Y) and a chrominance signal (Cb & Cr), and also generates information/concerning sync signals HSYNC_L, VSYNC_L, and BLANK_L. This block separates input data at the 27 MHz YCbCr (8-bit input) format into a luminance signal (Y) and a chrominance signal (Cb & Cr). This block separates input data at the 13.5 MHz YCbCr (16-bit input) format into a chrominance signal Cb and a chrominance signal Cr. Of the processed input data, luminance and chrominance signals other than valid pixel data are replaced by 8'h10 and 8'h80 respectively. 2. Y Limiter Block This block limits the luminance input signal by clipping the lower limit of an input signal outside the ITU601 Standard • Signals are limited to YD = 16 when YD < 16. • Signals are limited to TD = 254 when YD (input during a valid pixel period) = 255. In other cases, signals are fed as is to next processing. 3. C Limiter Block This block limits the chrominance signal by clipping the upper and lower limits of the input signal outside the ITU601 Standard. CD = 1 when CD = 0 is input during a valid pixel period. CD = 254 when CD = 255 is input during a valid pixel period. • Y Level Converter Converts ITU-601 standard luminance signal level to DAC digital input level. • U Level Converter Converts ITU-601 standard chrominance signal level to DAC digital input level. • V Level Converter Converts ITU-601 standard chrominance signal level to DAC digital input level. • YUV Color Generator This block generates luminance and chrominance signals from over lay color signals OLR, OLG and OLB. Control signals (CR [2:0] ) control the output content (overlay or color bar) and output level (100%, 75%, 50%, 25%). • Overlay Control This block selects input image data or YUV Color Generator output signals. It is determined by the level of the control signal (OLC, CR [2]), as shown below: (x : don't care) CR [2] = 1, OLC = x: Selects color bar signal (YUV Color Generator output signal). CR [2] = 0, OLC = 1: Selects overlay signal (YUV Color Generator output signal). CR [2] = 0, OLC = 0: Selects input image data. |
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