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# 16450

LogiCORE BUFE and BUFT Multiplexers v6.0 - Are these supported in the Spartan-3 architecture?

Description


General Description:
Are BUFE and BUFT multiplexers supported in the Spartan-3 architecture?

The data sheet "Feature" section states that Spartan-3 is supported; however, the Functional Description states:

"Note that due to the absence of internal BUFT primitives from the Spartan-3 architecture, it is not possible to utilize this core in any Spartan-3 device."

The data sheets for the BUFE Multiplexer v6.0 and BUFT Multiplexer v6.0 have conflicting statements. Which is correct?

Solution


The correct statement should be as follows:

"Due to the absence of internal BUFT primitives in the Spartan-3 architecture, it is not possible to implement the core using BUFT primitives. As a result, the core is implemented using slice logic."

This means that if you select Spartan-3 as the target architecture, the core is automatically generated using slice logic rather than BUFT primitives. In the next version of the core, the data sheets will be updated to describe this clearly.
AR# 16450
Date Created 09/03/2007
Last Updated 12/15/2012
Status Active
Type General Article