GS2961 Datasheet, PDF (43/104 Pages) Gennum Corporation – 3Gb/s, HD, SD SDI Receiver, with Integrated Adaptive Cable Equalizer 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
TRS position
SW_EN
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
ACTIVE PICTURE
EAV
ANC
SAV
Re - s y n c hronization
Figure 4-10: Switch Line Locking on a Non-Standard Switch Line
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 4-10 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 GS2961 does
not distinguish between 1125-line progressive segmented-frame (PsF) video and
GS2961 3Gb/s, HD, SD SDI Receiver, with Integrated
Adaptive Cable Equalizer
Data Sheet
48004 - 2
November 2009
43 of 104