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Chapter 4
Synchronization
4.1 Overview
In order for computing video applications to function properly with multiple displays
or external video devices, special signal processing called “output locking” is required.
Output locking synchronizes the display output of a GPU to a controlling signal, rather
than allowing the display to refresh according to the state that a GPU finds itself in after
being turned on. This controlling signal may be internally or externally generated, and
function alone or in conjunction with other GPUs.
Output locking is required to ensure the video signals from multiple sources are
synchronized, such as a video wall comprised of multiple small displays or when
computer-generated graphics are combined with video from an external video
camera.
Genlock (generator lock) is a type of output locking that synchronizes video outputs
with an external reference signal generator.
Framelock is a synchronization method that uses output locking and also
synchronizes 3D rendering on multiple GPUs.
Framelock and genlock for AMD FirePro™ workstation cards is provided by the ATI
FirePro S400 synchronization module. Each synchronization module supports
genlock and framelock for up to four GPUs per PC.
The following diagram shows the most important features of the ATI FirePro S400.
© 2009 Advanced Micro Devices, Inc.
ATI FirePro™ S400 Syncronization Module