AR# 43211

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Spartan-6 - Simultaneous Switching Output (SSO) Calculation - What are the SSO limits when using the untuned setting?

描述

The Spartan-6 FPGA SelectIO User Guide (UG381) gives theSimultaneous Switching Output (SSO) limits for different IOSTANDARDS, however, when using the untuned settings the user guide states the following:

"Setting the OUT_TERM attribute to one of these values will override the default value of NONE, and will also override all drive-strength and slew rates that the output buffer would have been set to for the assigned I/O standard."

So, how should the SSO limits be calculated when using any of the untuned settings?

解决方案

When using the untuned termination, use the PlanAhead tool to check the SSO limits. This will check all of the I/Os that are being used and indicate if the SSO limits are being exceeded.

链接问答记录

主要问答记录

Answer Number 问答标题 问题版本 已解决问题的版本
31905 Simultaneously Switching Noise - Where can I find documentation on SSO/SSN? N/A N/A
AR# 43211
日期 12/15/2012
状态 Active
Type 综合文章
器件
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