What SSO guidelines can be followed for Virtex-4 and Virtex-5 devices?
A part of Chapter 6 of Virtex-4 and Virtex-5 User Guides (UG070 and UG190) provides the guidelines for the maximum number of simultaneously switching outputs allowed per output power/ground pair to avoid the effects of ground bounce.
To verify whether a given design passed SSO design rules based on Parasitic Factors Derating Method (PFDM), the Virtex-5 SSO Calculator, that automates all the PFDM and SSO calculations is provided.
The Virtex-5 SSO Calculator can be downloaded from the Xilinx web site at:
The Virtex-4 SSO Calculator can be downloaded from the Xilinx web site at:
This is a primarily Microsoft Excel-based spreadsheet.