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AR# 33394

Spartan-3 FPGA DCM Architecture Wizard - the CLKFX jitter calculator gives a very low jitter number. Is it correct?

Description

When using the Spartan-3 Architecture Wizard to calculate the CLKFX jitter number, the result can be very unusually low.

Solution

This is a known issue with the Spartan-3 FPGA jitter calculation. As a workaround, the Spartan-3A FPGA wizard can be used to calculate the CLKFX jitter numbers more accurately.
AR# 33394
Date Created 09/08/2009
Last Updated 12/15/2012
Status Active
Type General Article
Devices
  • Spartan-3
IP
  • Digital Clock Manager (DCM) Module