The design of code-decode circuits in PI-BUS interface unit chip and its software realization

PI bus conveys datum among multi-parallel-job modules by way of separate byte or double bytes. It is because of better compatibility, real-time and reliability that PI bus is used for the interlinkage of multi-parallel-job modules in multiprocessor system. In this paper, an example was given to illustrate the principle of the code-decode circuits. It presented some thought on the application of EDA in these circuits and the methods on VHDL.