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GS2970A Datasheet(PDF) 44 Page - Semtech Corporation |
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GS2970A Datasheet(HTML) 44 Page - Semtech Corporation |
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44 / 150 page  GS2970A 3Gb/s, HD, SD SDI Receiver Data Sheet 54244 - 2 September 2012 44 of 150 4.10.1 Manual Switch Line Lock Handling The principle of switch line lock handling is that the switching of synchronous video sources will only disturb the horizontal timing and alignment, whereas the vertical timing remains in synchronization - i.e. switching between video sources of the same format. To account for the horizontal disturbance caused by a synchronous switch, the word alignment block and timing signal generator automatically re-synchronizes to the new timing immediately if the synchronous switch happens during the designated switch line, as defined in SMPTE recommended practice RP168-2002. The device samples the SW_EN pin on every PCLK cycle. When a Logic LOW to HIGH transition on this pin is detected anywhere within the active line, the word alignment block and timing signal generator re-synchronize immediately to the next TRS word. This allows the system to force immediate lock on any line, if the switch point is non-standard. To ensure proper switch line lock handling, the SW_EN signal should be asserted HIGH anywhere within the active portion of the line on which the switch has taken place, and should be held HIGH for approximately one video line. After this time period, SW_EN should be de-asserted. SW_EN should be held LOW during normal device operation. NOTE: It is the rising edge of the SW_EN signal, which generates the switch line lock re-synchronization. This edge must be in the active portion of the line containing the video switch point. Figure 4-10:Switch Line Locking on a Non-Standard Switch Line EAV ANC AC TIVE PICTU RE EAV ANC SAV EAV ANC ACTIVE PICTUR E SAV EAV ANC ACTIVE PICTURE SAV EAV ANC SAV Video source 1 EAV ANC AC TIVE PICTU RE EAV ANC SAV EAV ANC ACTIVE PICTUR E SAV EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Video source 2 EAV ANC AC TIVE PICTU RE SAV EAV ANC SAV DATA IN ACTIVE PICTURE EAV ANC SAV ANC ACTIVE PICTURE EAV ANC SAV Switch point TRS position EAV ANC AC TIVE PICTU RE SAV EAV ANC SAV ANC ACTIVE PICTURE DATA OUT ACTIVE PICTURE EAV ANC SAV EAV ANC SAV SW _EN sw itch video source 1 to 2 EAV ANC AC TIVE PICTU RE EAV ANC SAV EAV ANC ACTIVE PICTUR E SAV EAV ANC ACTIVE PICTURE SAV EAV ANC SAV Video source 1 EAV ANC AC TIVE PICTU RE EAV ANC SAV EAV ANC ACTIVE PICTUR E SAV EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Video source 2 EAV ANC AC TIVE PICTU RE SAV EAV ANC SAV DATA IN ACTIVE PICTURE EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Switch point EAV ANC AC TIVE PICTU RE SAV EAV ANC SAV ACTIVE PICTURE DATA OUT sw itch video source 2 to 1 EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Re-synchronization SW _EN Re-synchronization TRS position |
Similar Part No. - GS2970A |
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Similar Description - GS2970A |
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