Simulation using accelerated models

A system, comprising:

• a processor configured to initiate operations including:
• determining that a design unit of a circuit design specified in a hardware description language is a prime block;
• determining an output vector corresponding to an output of the prime block;
• wherein the output of the prime block is dependent only on one or more inputs of the prime block and the prime block interacts with the circuit design only through the one or more inputs and the output;
• replacing contents of the prime block with an accelerated simulation model specified in a high level language, wherein the accelerated simulation model determines a value for the output of the prime block as a function of values of the one or more inputs of the prime block using the output vector;
• elaborating the circuit design;
• and
• compiling the circuit design into object code that is executable to simulate the circuit design.

A method, comprising:

• during a simulation of a circuit design using computer hardware, determining values of inputs to an accelerated simulation model of a design unit of the circuit design, wherein the design unit is a prime block;
• wherein an output of the prime block is dependent only on one or more inputs of the prime block and the prime block interacts with the circuit design only through the one or more inputs and the output;
• during the simulation, computing an index based on the values of the inputs;
• and
• during the simulation, determining a value for an output of the accelerated simulation model by selecting a value from an output vector of the accelerated simulation model based on the index, wherein the output vector is a one dimensional array of values corresponding to the output of the accelerated simulation model.