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GS9090B Datasheet(PDF) 28 Page - Gennum Corporation

Part # GS9090B
Description  GenLINX짰 III 270Mb/s Deserializer for SDI
Download  71 Pages
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Manufacturer  GENNUM [Gennum Corporation]
Direct Link  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS9090B Datasheet(HTML) 28 Page - Gennum Corporation

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GS9090B Data Sheet
40749 - 2
January 2007
28 of 71
3.6.3 Switch Line Lock Handling
The principle of switch line lock handling is that the switching of synchronous video
sources will only disturb the horizontal timing and alignment of the stream, whereas
the vertical timing remains in synchronization.
3.6.3.1 Automatic Switch Line Lock Handling
The GS9090B also implements automatic switch line lock handling. By utilizing
both the synchronous switch point defined in SMPTE RP168, and the automatic
video standards detect function, the device automatically re-synchronizes the
flywheel at the switch point. This will occur whether or not the device has detected
TRS word errors. Word alignment re-synchronization will also take place at this
time.
Automatic switch line lock handling will occur regardless of the setting of the
FW_EN 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 625 line interlaced systems: re-sync takes place at the end of lines 6 & 319
A full list of 270Mb/s video standards and switching lines is shown in Table 3-3.
At every PCLK cycle the device samples the FW_EN pin. When the FW_EN pin is
set LOW anywhere within the active line, the flywheel will re-synchronize
immediately to the next TRS word.
3.6.3.2 Manual Switch Line Lock Handling
The ability to manually re-synchronize the flywheel is also important when
switching asynchronous sources or to implement other non-standardized video
switching functions.
To account for the horizontal disturbance caused by a synchronous switch, it is
necessary to re-synchronize the flywheel immediately after the switch has taken
place. Rapid re-synchronization of the GS9090B to the new video standard can be
achieved by disabling the flywheel (setting the FW_EN pin to logic LOW) after the
switch, and re-enabling the flywheel after the next TRS word.
Table 3-3: Switch Line Position for 270MB/s Digital Systems
System
Video Format
Sampling
Signal
Standard
Parallel
Interface
Serial
Interface
Switch Line
Number
SDTI
720x576/50 (2:1)
4:2:2
BT.656
BT.656 + 305M
259M-C
6, 319
720x483/59.94 (2:1)
4:2:2
125M
125M + 305M
259M-C
10, 273
525
720x483/59.94 (2:1)
4:2:2
125M
125M
259M-C
10, 273
625
720x576/50 (2:1)
4:2:2
BT.656
125M
259M-C
6, 319


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