AR# 17852: Schematic - OBUFE symbol does not appear when I target a Spartan-3 (S3) device
Schematic - OBUFE symbol does not appear when I target a Spartan-3 (S3) device
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.
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.