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AR# 14967

Virtex-II packaging - What does the NC (No Connect) mean? Can I use these pads for any purpose?

Description

Are pads that are marked NC (No Connect) available for any purpose, such as for registers or for manufacturing purposes?

Solution

No, these pads/IOBs are not available for any use. For example, in the Virtex-II FF1517 pinout sheet, there are NCs for the XC2V4000 of the FF1517, and they are connected for the XC2V6000. There are more IOBs for the XC2V6000; as a result, there are no connects for the smaller device. When you open up that device in the FPGA Editor, you will see that they do not even exist.

AR# 14967
Date Created 08/29/2007
Last Updated 05/14/2014
Status Archive
Type General Article