模式Y(jié)CbCr4:2:0在HDMI2.0中介紹。 一,、模式介紹 不同模式下tmds時(shí)鐘與與像素的比是位寬與24的比值 24 bit YCbCr 4:2:0 mode:TMDS clock = 0.5x pixel clock 30 bit YCbCr 4:2:0 mode:TMDS clock = 0.625x pixel clock 36 bit YCbCr 4:2:0 mode:TMDS clock = 0.75x pixel clock 24 bit mode: TMDS clock = 1.0 x pixel clock (1:1) ,包括24位RGB,、8/10/12位YCbCr 4:2:2,48位YCbCr 4:2:0模式 30 bit mode: TMDS clock = 1.25 x pixel clock (5:4) 36 bit mode: TMDS clock = 1.5 x pixel clock (3:2) 48 bit mode: TMDS clock = 2.0 x pixel clock (2:1) 在傳輸過(guò)程中視頻數(shù)據(jù)和信號(hào)(Hsync vsync,,de)打包成一系列像素組,,在每一個(gè)TMDS時(shí)鐘,傳輸一個(gè)像素組的一段,。 下面是一個(gè)像素組中像素的個(gè)數(shù)和段數(shù): 24 bit mode: 1 pixel/group, 1 fragment/group 30 bit mode: 4 pixels/group, 5 fragments/group 36 bit mode: 2 pixels/group, 3 fragments/group 48 bit mode: 1 pixel/group, 2 fragments/group 每個(gè)TMDS字符期間傳輸像素組的一段,,所以也代表一個(gè)組的包相位,,為了同步,,源會(huì)發(fā)送一個(gè)包,至少一場(chǎng)一次,。 二,、數(shù)據(jù)打包(參考HDMI官方文檔) |
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