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TW2809C1 Datasheet(PDF) 13 Page - Renesas Technology Corp |
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TW2809C1 Datasheet(HTML) 13 Page - Renesas Technology Corp |
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13 / 130 page  TW2809C FN7875 Rev. 1.00 Page 13 of 130 February 27, 2014 video input on port 2 and 3. At the same time, TW2809C can receive HD video input on port 0 and 1. VIDEO INPUT LOGIC PORTS There are some limitations on how to use TW2809C physical ports for SD or HD video inputs. 1) Four input ports at frame interleaved mode: @27/54/108MHz. Use port 0-3 port-0: {vi0_data[7:0]} clk_vi0 @ 27/54/108MHz port-1: {vi1_data[7:0]} clk_vi1 @ 27/54/108MHz port-2: {vi2_data[7:0]} clk_vi2 @ 27/54/108MHz port-3: {vi3_data[7:0]} clk_vi4 @ 27/54/108MHz 1)2)Two input ports at byte interleaved mode @54MHz. Use port-0 and port-2 port-0: {vi0_data[7:0]} clk_vi0 @ 54MHz port-2: {vi2_data[7:0]} clk_vi2 @ 54MHz 3) One input port at byte interleaved mode @ 108MHz. Use port-0 port-0: {vi0_data[7:0]} clk_vi0 @ 108MHz BT.656 FRAME INTERLEAVED VIDEO INPUT The frame interleaved case is rather simple. Each TW2809C video input port can operate up to 108MHz. The clocks of four ports are independent from each other. For example, the user can feed two channel video inputs to port 0 at 54MHz. At the same, the user can also feed one channel video input to port 1 at 27MHz. For 8SD encoding only case, TW2809C accepts up to 8 SD video inputs. BT.656 BYTE INTERLEAVED 54MHz VIDEO INPUT Video input port 0 and port 2 can take 54MHz byte interleaved video input. When port 0 is used for 54MHz video input, port 1 cannot connect to any video input. vi0_data[7:0] 2ch video input clk_vi0 54MHz TW2809 vi2_data[7:0] 2ch video input clk_vi2 54MHz FIGURE 6 . BYTE-INTERLEAVE 54MHz VIDEO INPUT TOP LEVEL DIAGRAM When port 2 is used for 54MHz video input, port 3 cannot connect to any video input. BT.656 BYTE INTERLEAVED 108MHz VIDEO INPUT Video port 0 is the only port that accepts 108MHz byte interleaved video input. When port 0 is used for 108MHz video input, all other three video input ports cannot connect to any video input. vi0_data[7:0] 4ch video input clk_vi0 108MHz TW2809 FIGURE 7 . 108MHz BYTE-INTERLEAVE VIDEO INPUT TOP LEVEL DIAGRAM BT.1120 HD VIDEO INPUT TW2809C is designed to take two channel HD video inputs. As shown in the following figure, video physical input ports 0 and 1 can be grouped together to receive one HD video input. The HD video input clock is connected to pin clk_vi0. It is noted that video input port 0 and 1 should be connected to HD luma and chroma ports respectively. Physical video input ports 2 and 3 can be used to receive another HD video input similar as video input port 0 and 1. |
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