0 Replies Latest reply: Jul 2, 2012 8:50 AM by jscheller RSS

FPGA clocking

jscheller Community Member
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Hi everyone,

 

I have a quick question regarding the clocking of the FPGA. I was wondering whether it is derived from the same clock as the SCC? The reason I'm asking is that I would like to calculate a core's offset to the global clock in order to have a common time basis amongst all cores. Now when use the FPGA clock of 125 MHz and the Cores' clock of 533 MHz I arrive at a ratio of 64/15. Using this ration I should be able to calculate a core's offset using:

 

offset = (FPGA_clock/15)*64+(local_clock-RTT/2)

Unfortunately it seems that using this relationship between the clocks does not provide me with a constant offset but instead the offset decreases when the same procedure is repeated over time.

Is there a drift between the FPGA's clock and the Cores' clocks? Any ideas would be great.

 

Thanks a lot in advance.

 

Best regards

 

Johannes

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