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GS9060 Datasheet(PDF) 32 Page - Gennum Corporation |
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GS9060 Datasheet(HTML) 32 Page - Gennum Corporation |
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32 / 61 page  GS9060 Data Sheet 22208 - 8 January 2007 32 of 61 Figure 3-2: Switch Line Locking The ability to manually re-synchronize the flywheel is also important when switching asynchronous sources or to implement other non-standardized video switching functions. The GS9060 also implements automatic switch line lock handling. By utilizing the synchronous switch points defined by SMPTE RP168 for all major video standards with the automatic video standards detect function, the device automatically re-synchronizes the flywheel at the switch point. This function will occur regardless of the setting of the FW_EN/DIS pin. The switch line is defined as follows: • For 525 line interlaced systems: re-sync takes place at the end of lines 10 & 273. • For 525 line progressive systems: re-sync takes place at the end of line 10. • For 625 line interlaced systems: re-sync takes place at the end of lines 6 & 319. • For 625 line progressive systems: re-sync takes place at the end of line 6. A full list of all major video standards and switching lines is shown in Table 3-3. NOTE: The flywheel timing will define the line count such that the line numbers shown in Table 3-3 may not correspond directly to the digital line counts. EAV ANC ACTIVE PICTURE EAV ANC SAV EAV ANC ACTIVE PICTURE SAV EAV ANC ACTIVE PICTURE SAV EAV ANC SAV Video source 1 EAV ANC ACTIVE PICTURE EAV ANC SAV EAV ANC ACTIVE PICTURE SAV EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Video source 2 EAV ANC ACTIVE PICTURE SAV EAV ANC SAV DATA IN ACTIVE PICTURE EAV ANC SAV ANC ACTIVE PICTURE EAV ANC SAV Switch point Flywheel TRS position EAV ANC ACTIVE PICTURE SAV EAV ANC SAV ANC ACTIVE PICTURE DATA OUT ACTIVE PICTURE EAV ANC SAV EAV ANC SAV FW_EN/DIS switch video source 1 to 2 Flywheel re-synch EAV ANC ACTIVE PICTURE EAV ANC SAV EAV ANC ACTIVE PICTURE SAV EAV ANC ACTIVE PICTURE SAV EAV ANC SAV Video source 1 EAV ANC ACTIVE PICTURE EAV ANC SAV EAV ANC ACTIVE PICTURE SAV EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Video source 2 EAV ANC ACTIVE PICTURE SAV EAV ANC SAV DATA IN ACTIVE PICTURE EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Switch point Flywheel TRS position EAV ANC ACTIVE PICTURE SAV EAV ANC SAV ACTIVE PICTURE DATA OUT switch video source 2 to 1 EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Flywheel re-synch FW_EN/DIS |
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