Using Three-State Enable Registers in 4000XLA/XV, and Spartan-XL FPGAs
The use of the internal IOB three-state control register can significantly improve output enable and disable time. This application note describes how to use hard macros to implement this register in both HDL and schematic based designs.
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XC4000XV, XAPP123, Spartan-XL, XC4000XLA
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