Answers Database

Leonardo 4.13/Galileo 4.11 is creating wrong logic for D latch on 4K devices using xnf format


Record #3824

Product Family:  Software

Product Line:  Exemplar

Problem Title:
Leonardo 4.13/Galileo 4.11 is creating wrong logic for D latch on 4K
devices using xnf format



Problem Description:
Keywords: Leonardo, Galileo, logic, wrong, latch, DLAT, enable

Urgency: Standard

General Description:

Leonardo/Galileo is creating the wrong logic for my 4K D Latch.

Symptom:  Leonardo/Galileo treat Xilinx dlatch (DLAT) as active-
low enable instead of active-high enable.

The bug needs all three conditions to happen.

   1. Software versions: Leonardo 4.13
			 or Galileo Extreme 4.11

   2. Libraries: XC4000, XC4000A, XI4000H
		XC4000E, XC4000EX, XC4000L, XC4000XL

   3. Output format: xnf


Solution 1:

Fix/workaround:  do one of the following:

   1.  Use edif format for output netlists.

   2.  Down load the updated libraries from Exemplar ftp site
   (ftp.exemplar.com) in directory /pub/patches/libraries/4.1.

      xi4 version 1.46
      xi4a version 1.46
      xi4h version 1.46
      xi4h version 1.46
      xi4e version 0.7
      xi4ex version 0.7
      xi4l version 0.7
      xi4xl version 0.7

   3.  Update to Galileo Extreme 4.15 or Leonardo 4.15 (available
   for download at www.exemplar.com), or later version.



End of Record #3824