AR# 11713


Virtex-E/-II/-II Pro/-4/-5 - Maximum number of simultaneously switching outputs per Power/Ground pair (SSO guidelines)


What are the simultaneously switching outputs (SSO) guidelines for Virtex-E, Virtex-II, and Virtex-II Pro, Virtex-4, Virtex-5 devices?


For a detailed discussion about handling SSOs, please refer to (Xilinx XAPP689), Managing Ground Bounce in Large FPGAs. The SSO guidelines pointed to below are to be used in conjunction with the methodology outlined in the Application Note.

See the Simultaneous Switching Output Limits Section


Refer to the Virtex-4 FPGA User Guide at:
See the Nominal SSO Limit Section

Virtex-II Pro

Refer to the Virtex-II Pro and Virtex-II Pro X FPGA User Guide at:
See Simultaneous Switching Guidelines


Refer to the Virtex-II Platform FPGA User Guide at:
See Simultaneous Switching Output (SSO) Guidelines


Refer to the Detailed Functional Description data sheet at:
Select Using Select I/O -> Design Considerations -> Simultaneous Switching Guidelines.

NOTE: The SSO guidelines for HSTL18 ( HSTL with VCCO = 1.8V) are not yet listed. For now, use the regular HSTL (with VCCO = 1.5V) guidelines and reduce by 25%. For more information on HSTL 1.8V support, refer to (Xilinx Answer 9762).

AR# 11713
Date 12/15/2012
Status Active
Type General Article
People Also Viewed