UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 23180

8.2i CPLDFit - Fitter Report incorrectly reports tristate equations when GTS is used as the tristate enable

Description

When the Global Tri-State (GTS) is used as a tristate control, the HTML fitter report omits the equation for the tristate enable.

Solution

The HTML Fitter report incorrectly omits the GTS enabled tristate equation, showing only the data buffer. 

 

Example: 

OUT_A_I <= IN_A;  

 

Should look like this: 

OUT_A_I <= IN_A; 

OUT_A <= OUT_A_I when OUT_A_OE = '1' else 'Z';  

 

The ABEL-style equations show the implemented logic correctly and the device will behave correctly. This is simply a report issue with VHDL and Verilog style equations.

AR# 23180
Date Created 09/04/2007
Last Updated 05/08/2014
Status Archive
Type General Article