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STV2310 数据表(PDF) 41 Page - STMicroelectronics |
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STV2310 数据表(HTML) 41 Page - STMicroelectronics |
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41 / 112 page  41/112 STV2310 Functional Description To force the pass through mode, use the PASSTHROUGH_EN bit in the DDECCONT38 register. To shift the external Hsync pulse, use the HSYNCSHIFT_DEL[1:0] and HSYNCSHIFT_EN bits in the DDECCONT22 register. Cr Cb attenuation are controlled by the DDECCONT37 and the DDECCONT38 registers. The output blanking modes are controlled by the OUTBEHAV_BLANK2 and OUTBEHAV_BLANK1 bits in the DDECCONT38 register. Output clipping is controlled by the DDECCONT18 register bit [2]. The PLLLOCK, HSYNC, VSYNC and FIELD pins may have bus extension functions. This is done by programming the OUTBUS [7:0] bits in the DDECCONT7 register. The PLLLOCK pin has a second alternate IRQ (Interrupt Request) function, selected by the PLLLOCKIT_EN bit in the DDECCONT35 register. Note: By default, the PLLLOCK, HSYNC, VSYNC, and FIELD pins are used for their primary functions. 4.13 VBI Data Slicing and Insertion The following standards are supported by the VBI Data Slicer (see Table 14). After slicing, VBI data is embedded in the output stream, using the intervals between the End of Active Video (EAV) and the Start of Active Video (SAV) codes of each line and formatted according to the ancillary sequences in compliance with specification ITU-R BT.656. VBI data is inserted in the Output FIFO. Table 13: Output PLL Alternate Functions Bitfield Description OUTBUS[0] 0: Standard function. 1: PLLLOCK = OUTBUS[1] OUTBUS[6] 0: Standard function. 1: FIELD = OUTBUS[7] OUTBUS[4] 0: Standard function. 1: VSYNC = OUTBUS[5] OUTBUS[2] 0: Standard function. 1: HSYNC = OUTBUS[3] Table 14: VBI Slicing Standards VBI Standards TV Systems (lines/freq.) TV Lines1 1. Lines are numbered in compliance with specification ITU-R BT.470. Bit Rate (Mbit/s) Modulation Bytes per Line Teletext B WST 625/50 6 to 22 6.9375 NRZ 45 VPS 625/50 16 2.5000 Bi-phase 15 WSS 625/50 23 0.8333 Bi-phase 14 bits of data Closed Caption 625/50 21/22 0.5035 NRZ 3 Teletext B-WST1 525/60 10 to 21 5.727272 NRZ 37 Closed Caption 525/60 21 0.5035 NRZ 3 Gemstar 525/60 21 1.007 NRZ 5 |
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