Globally asynchronous locally synchronous

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Globally asynchronous locally synchronous (GALS) is a circuit that consists of a set of locally synchronous modules communicating with each other via asynchronous wrappers. Advantages include lower power consumption and electromagnetic interference (EMI). GALS is sometimes used in system-on-a-chip (SoC).

GALS is a compromise between a completely synchronous system (a single clock domain, perhaps with clock gating on some registers) and a completely asynchronous circuit (every register can be considered its own independent clock domain). Each synchronous subsystem ("clock domain") can run on its own independent clock frequency. [1]

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External links

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  1. Zhoukun WANG and Omar HAMMAMI. "A 24 Processors System on Chip FPGA Design with Network on Chip". [1]