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TW2864D Datasheet(PDF) 23 Page - Renesas Technology Corp |
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TW2864D Datasheet(HTML) 23 Page - Renesas Technology Corp |
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23 / 110 page  TW2864 FN7745 Rev. 0.00 Page 23 of 110 September 28, 2012 Output Format The TW2864 supports a standard ITU-R BT.656 format. All video data and timing signal of four channels are synchronous with the pins CLKPO or CLKNO output. Therefore, CLKPO or CLKNO can be connected to four channel interfaces for synchronizing data. And, the phase of CLKPO or CLKNO can be controlled by delay unit via the CLKP_DEL or CLKN_DEL registers and polarity inverse cell via the CLKP_POL or CLKN_POL registers independently. ITU-R BT.656 FORMAT In ITU-R BT.656 format, SAV and EAV sequences are inserted into the data stream to indicate the active video time. It is noted that the number of active pixels per line is constant in this mode regardless of the actual incoming line length. The output timing is illustrated in Figure 9. The SAV and EAV sequences are shown in Table 3.. An optional set of 656 SAV/EAV code sequence can be enabled to identify no-video status using the NOVID_656 bit. CLKP VD[7:0] Cb0 Y0 Cr0 80h 16h 80h 160h FFh 00h 00h 00h 00h XY FFh XY Y1 HACIVE EAV code SAV code Cb2 Y2 Cr2 Y3 FIGURE 9. TIMING DIAGRAM OF ITU-R BT.656 FORMAT TABLE 3. ITU-R BT.656 SAV AND EAV CODE SEQUENCE CONDITION 656 FVH VALUE SAV/EAV CODE SEQUENCE FIELD V TIME H TIME FIELD V TIME H TIME FIRST SECOND THIRD FOURTH NOMINAL OPTION* EVEN Blank EAV 1 1 1 0xFF 0x00 0x00 0xF1 0x71 EVEN Blank SAV 1 1 0 0xFF 0x00 0x00 0xEC 0x6C EVEN Active EAV 1 0 1 0xFF 0x00 0x00 0xDA 0x5A EVEN Active SAV 1 0 0 0xFF 0x00 0x00 0xC7 0x47 ODD Blank EAV 0 1 1 0xFF 0x00 0x00 0xB6 0x36 ODD Blank SAV 0 1 0 0xFF 0x00 0x00 0xAB 0x2B ODD Active EAV 0 0 1 0xFF 0x00 0x00 0x9D 0x1D ODD Active SAV 0 0 0 0xFF 0x00 0x00 0x80 0x00 *Option includes video loss information in ITU-R BT.656 |
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