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GS1661 Datasheet(PDF) 36 Page - Semtech Corporation

Part # GS1661
Description  HD/SD SDI Receiver, with Integrated Adaptive Cable Equalizer complete with SMPTE Video Processing
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

GS1661 Datasheet(HTML) 36 Page - Semtech Corporation

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GS1661 HD/SD SDI Receiver
Data Sheet
53751 - 3
September 2012
36 of 84
Figure 4-5: Switch Line Locking on a Non-Standard Switch Line
4.9.2 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 4.9.1 and Figure 4-5 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 GS1661 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.
A full list of all major video standards and switching lines is shown in Table 4-7.
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


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