GS2960 Datasheet, PDF (41/97 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Video Processing

Video source 1
EAV
ANC
SAV
ACTIVE PICTURE
Switch point
EAV
ANC
S AV EA V ACTIVE PAINCCTUR E
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
Video source 2
DATA IN
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV E AV ACTIVE PAINCCTUR E
EAV
ANC
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
switch video source 1 to 2
ACTIVE PICANTUCRE
EAV
ANC
SAV
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
ANC
SAV
EAV
ANC
SAV
DATA OUT
TRS position
SW_EN
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
ACTIVE PICANTUCRE
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
Re - s y n c hronization
Video source 1
Video source 2
DATA IN
Switch point
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
S AV EA V ACTIVE PAINCCTUR E
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
EAV
ANC
SAV
EAV
ANC
SAV
ACTIVE PICTURE
ACTIVE PICTURE
EAV
EAV
ANC
ANC
SAV E AV ACTIVE PAINCCTUR E
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
switch video source 2 to 1
SAV
ACTIVE PICTURE
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
DATA OUT
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
ACTIVE PICTURE
TRS position
SW_EN
Re - s y n c hronization
Figure 4-9: Switch Line Locking on a Non-Standard Switch Line
EAV
ANC
SAV
4.10.2 Automatic Switch Line Lock Handling
The synchronous switch point is defined for all major video standards in SMPTE
RP168-2002. The device automatically re-synchronizes the word alignment block and
timing signal generator at the switch point, based on the detected video standard.
The device, as described in Section 4.10.1 and Figure 4-9 above, implements the
re-synchronization process automatically, every field/frame. The switch line is defined
as follows:
• For 525 line interlaced systems: resynchronization takes place at then end of lines 10 & 273
• For 525 line progressive systems: resynchronization takes place at then end of line 10
• For 625 line interlaced systems: resynchronization takes place at then end of lines 6 & 319
• For 625 line progressive systems: resynchronization takes place at then end of line 6
• For 750 line progressive systems: resynchronization takes place at then end of line 7
• For 1125 line interlaced systems: resynchronization takes place at then end of lines 7 & 568
• For 1125 line progressive systems: resynchronization takes place at then end of line 7
NOTE: Unless indicated by SMPTE 352M payload identifier packets, the GS2960 does
not distinguish between 1125-line progressive segmented-frame (PsF) video and
1125-line interlaced video operating at 25 or 30fps. However. PsF video operating at
24fps is detected by the device.
GS2960 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Video Processing
Data Sheet
48003 - 6
September 2012
41 of 97