Sun Microsystems Sun Fire V880z, Инструкция по установке и эксплуатации

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C H A P T E R
8
Genlocking Sun XVR-4000
Graphics Accelerators
This chapter describes genlocking multiple Sun XVR-4000 graphics accelerators.
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“Sun XVR-4000 Graphics Accelerator Genlock” on page 63
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“Connecting the Genlock Cable” on page 64
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“Enabling Genlocking for Graphics Accelerators” on page 67
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“Disabling Genlock” on page 72s
Sun XVR-4000 Graphics Accelerator
Genlock
Genlock and framelock are different methods of accomplishing synchronization of
video timing between two computer graphics systems. Framelock synchronizes two
video streams by asynchronously resetting the slave device is vertical timing, and
does not guarantee that pixels are aligned in the two streams. This situation could
result in dropped video lines.
Genlock, on the other hand, generates its pixel clock from the master video timing
signals, using phase locked loop (PLL) techniques, so they each produce pixels at
precisely the same rate, even if the master timing changes over time. Genlock
currently requires the video formats to be identical in resolution and frame rate.
When using genlock with framelock (Chapter 7), the vertical reset is always received
on the same video line. The slave cannot gain or drop a line of video with respect to
the master display device when genlocked.
Sun XVR-4000 graphics accelerators in different systems may be genlocked. Be sure
to issue the appropriate commands, video formats, and so on, to each system
graphics accelerator to be genlocked.