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5.1i Timing Simulation, NGDAnno - What is the purpose of the X_SUH component that is inserted into the back-annotated simulation netlist?
Keywords: timing, simulation, SUH, X_SUH, GSUH, setup, hold, violation
What is the purpose of the X_SUH component that is inserted into the back-annotated simulation netlist?
For this information, please refer to the NGDAnno chapter in the Development System Reference Guide:
The last section, "External Setup and Hold Check", contains a detailed description of the reasons that these checks are performed and how they are computed.
Because they can often cause invalid errors in the simulation, these checks were disabled in 5.1i Service Pack 2. For more information, please refer to (Xilinx Answer 15090).