GS1560A/GS1561 Data Sheet
Switch point
Video source 1
Video source 2
EAV
ANC
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
ANC
SAV EAV ACTIVE PAICNTCURE
EAV
ANC
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
ANC
SAV
EAV
ANC
SAV
EAV
ANC
SAV EAV ACTIVE PAICNTCURE
EAV
ANC
ANC
ANC
SAV
EAV
ANC
SAV
switch video source 1 to 2
EAV
EAV
ANC
ANC
SAV
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
EAV
ANC
ANC
SAV
SAV
ACTIVE PICATNUCRE
ACTIVE PICATNUCRE
EAV
EAV
SAV
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
EAV
ANC
ANC
SAV
SAV
DATA IN
DATA OUT
Flywheel TRS
position
FW_EN/DIS
Flywheel re-synch
Switch point
Video source 1
Video source 2
EAV
ANC
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
ANC
SAV EAV ACTIVE PAICNTCURE
EAV
ANC
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
ANC
SAV
EAV
ANC
SAV
EAV
ANC
SAV EAV ACTIVE PAICNTCURE
EAV
ANC
SAV
EAV
ANC
SAV
switch video source 2 to 1
EAV
EAV
ANC
ANC
SAV
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
EAV
ANC
ANC
SAV
SAV
ACTIVE PICTURE
EAV
EAV
ANC
SAV
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
EAV
ANC
SAV
SAV
DATA IN
ACTIVE PICTURE
ANC
ANC
DATA OUT
Flywheel TRS
position
FW_EN/DIS
Flywheel re-synch
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 GS1560A/GS1561 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.
27360 - 8 September 2005
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GENNUM [ GENNUM CORPORATION ]
