AR# 16450: LogiCORE BUFE and BUFT Multiplexers v6.0 - Are these supported in the Spartan-3 architecture?
LogiCORE BUFE and BUFT Multiplexers v6.0 - Are these supported in the Spartan-3 architecture?
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?
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.