Hierarchical structured module system.

摘要

A hierarchical structured module system comprising: a first bus line connected to a CPU; a second bus line connected to the first bus line through a bus interface; a common unit connected to the second bus line; and a plurality of individual units connected to the common unit, each of the individual units including a plurality of circuit substrates for doing functions assigned thereto and a common substrate connected to the respective circuit substrates, the CPU outputting to the first bus line a unit number and a substrate number for selecting one out of the circuit substrates for doing a required one of the functions, the common unit selecting, based on the unit number from the CPU, one of the individual unit indicated by the unit number, and connecting the second bus line to the selected individual unit, the common substrate of the individual unit selected by the common unit and connected to the second bus line selecting, based on the substrate number from the CPU, one of the associated circuit substrates indicated by the substrate number. <IMAGE>