Reading and Modifying Values Using VPI Routines

Summary

This chapter has presented the VPI routines which read and modify logic values and delay values in Verilog simulations. The VPI routines provide a means for PLI applications to access the logic and delay values of any object within simulation. This interface layer makes it possible for a PLI application to be portable to any IEEE 1364 compliant simulator, without concern for how the each simulator stores this complex information. Several short PLI applications illustrate the concepts presented.

The next chapter presents another powerful aspect of the VPI routines, the ability to synchronize PLI application activity with simulation activity.