Patent ID: 8626481

Claim:
A method of simulating a circuit design, comprising: displaying a block diagram of the circuit design, each block corresponding to one of a plurality of sub-circuits of the circuit design, each block having at least one input and at least one output, and at least one of the input or output of each block being connected to another block; inputting simulation input data to a simulation model of the circuit design; and during simulation on a computer system of each of a plurality of the sub-circuits with the simulation model, performing steps including: determining an output data value from one or more input data values to the simulated sub-circuit; concurrent with determining the output data value, determining an output tag value corresponding to the output data value; and displaying each output tag value proximate an output signal line from the block corresponding to the sub-circuit and concurrent with output of the output data value from the simulated sub-circuit; wherein each output tag value is displayed at a time responsive to the corresponding output data value being changed during simulation.