Power grid wiring for semiconductor devices having voltage islands

摘要

A semiconductor device comprising: a global power bus having a first portion for supplying power to a first set of circuits and a second portion for supplying power to a second set of circuits; a local power bus for supplying alternative power to the second set of circuits; and wherein the total of the width of the second portion of the global power bus and of the width of the local power bus does not exceed the width of the first portion of the global power bus.