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# 17852

Schematic - OBUFE symbol does not appear when I target a Spartan-3 (S3) device

Description

Keywords: ECS, OBUFT, 52i, ISE, schematic, macro

When I target a Spartan-3 device and use the ISE Schematic Editor for design entry, the symbol for an OBUFE macro is not present.

Solution

To implement the OBUFE functionality in a Spartan-3 schematic design, you must use an OBUFT component and place an INVERTER connected to the "T" enable pin.

A user-created macro named OBUFE can be constructed with an INVERTER and OBUFT component to aid in creating multiple outputs with OBUFE functionality, or to aid in converting a schematic design from another device family.
AR# 17852
Date Created 09/03/2007
Last Updated 03/05/2008
Status Archive
Type General Article