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AR# 29539

Virtex-4 - "Error: NGDBuild 462: input pad drive multiple buffers" when connecting DCMs in parallel


When connecting DCMs in parallel, ngdbuild produces the following error message:

"Error: NGDBuild 462: input pad drive multiple buffers"

How do you set up the input to drive more than one DCM?


When the input clock is driving multiple DCMs, it should be routed through an IBUFG. The output of the IBUFG can get successfully routed to the CLKIN of multiple DCMs.
AR# 29539
Date Created 11/13/2007
Last Updated 12/15/2012
Status Active
Type General Article
  • Virtex-4 FX
  • Virtex-4 LX
  • Virtex-4 QPro/R
  • Virtex-4 SX
  • Digital Clock Manager (DCM) Module