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STW8009 bảng dữ liệu(PDF) 11 Page - STMicroelectronics |
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STW8009 bảng dữ liệu(HTML) 11 Page - STMicroelectronics |
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11 / 66 page  Functional description STw8009/STw8019 10/65 4 Functional description 4.1 General STw80x9 operates either in master mode where it supplies all sync signal or in slave mode. The digital input is an 8-bit bus carrying Y, Cb and Cr at 13.5 MHz. Input samples are latched in on the rising edge of the clock input signal. STw80x9 is able to encode interlaced (in all standards) and non interlaced (in PAL and NTSC) video. STw80x9 outputs interlaced or non-interlaced video in PAL-B,D,G,H,I,PAL-N,PAL-M or NTSC-M standards (“NTSC-4.43” is also possible). The burst sequences are internally generated, subcarrier generation being performed numerically with the 27 MHz as reference. 4-frame bursts are generated for PAL or 2-frame bursts for NTSC. Rise and fall times of synchronization tips and burst envelope are internally controlled according to the relevant ITU_R and SMPTE recommendations. 4.2 Master & slave modes In master mode, STw80x9 supplies Hsync and Odd/Even sync signals (with independently programmable polarities) to drive other blocks. STw80x9 starts encoding and counting clock cycles as soon as the master mode has been loaded into the control register (Reg 0). Configuration bits “Syncout_ad[1:0]” (Reg 4) allow to shift the relative position of the sync signals by up to 3 clock cycles to cope with any YcbCr phasing. In slave modes, several modes are available, Odd/Even+Hsync based, Vsync+Hsync based, Odd/Even-only based, Vsync-only based or Sync-in-data based. 4.3 Auto test mode An auto test mode is available, which causes STw80x9 to produce a color bar pattern, in the appropriate standard, independently from the video input. 4.4 Input demultiplexor The incoming YcbCr 4:2:2 data are demultiplexed into chroma information stream, a “blue- difference” and a “red-difference”, and a luma information stream. Incoming data bits are treated as blue, red or luma samples according to their relative position with respect to the sync signals. Brightness, Saturation and Contrast are then performed on demultiplexed data. The ITU-R601 recommendation defines the black luma level as Y=16dec and the maximum white luma level as Y=235dec. Similarly it defines 255 quantification levels for the color difference components (Cr, Cb) centered around 128. Accordingly, incoming YcbCr samples can be saturated. In this case STw80x9 provides a saturation limitation feature to avoid having heavily saturated signal before digital to analog conversion and to avoid generating a distorted signal at STw80x9 CVBS or Y/C outputs. |
Số phần tương tự - STW8009_07 |
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Mô tả tương tự - STW8009_07 |
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