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AR# 47802

13.x/14.x iMPACT - Spartan-6 - Inconsistent DNA values from 'readdna' and 'readefuse -dna' commands

描述

For Spartan-6 devices, there are two command line options to read the device DNA - 'readdna' and 'readeffuse -dna'. 

These do not produce consistent results. 

Which one is correct?

解决方案

The "readdna" option should be used and is correct. 

The GUI also uses this option when you right click on the device icon and then select "Read Device DNA".

The DNA value readback using the 'readefuse -dna' option is incorrect. 

The issue with 'readefuse -dna' is in how the data is processed and displayed rather than the read operation itself.

Below is an example showing the discrepancy:

                100011110100010110100001011001000010101011010100111000111  -- readefuse dna

000000001110000101000111101000101101000010110010000101010                   -- readdna

AR# 47802
日期 12/07/2015
状态 Active
Type 综合文章
器件
  • Spartan-6 LXT
  • Spartan-6 LX
Tools
  • ISE Design Suite - 13.4, ISE Design Suite - 14.1, ISE Design Suite - 14.2, ISE Design Suite - 14.3, ISE Design Suite - 14.4, ISE Design Suite - 14.5, ISE Design Suite - 14.6, ISE Design Suite - 14.7
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