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Old 05-04-2006, 05:02 PM
Peter Alfke
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Default Re: Phase alignment of DCMs on different boards/devices

You must distinguish between the relatively long time that th DLL takes
to achieve lock (many microseconds) and the very small phase error on
the outputs (picoseconds, which is million times shorter) once the DLL
is locked

So, the different DLL will most likely achieve lock at different times,
but once in lock, they will each perform to data sheet specs, which
means picoseconds of difference on the outputs

Another matter is that frequency division can obviously generate
out-of-step outputs between different chips.

Peter Alfke, Xilinx

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