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发信人: alphame (糊涂), 信区: METech
标  题: mesochronous and plesiochronous
发信站: 哈工大紫丁香 (Thu Oct 21 15:58:51 2004), 转信

一些定义:
Signals that can only transition at predetermined times with respect to a signal clock are called “{syn,meso,plesio}chronous”

An asynchronous signal can transition at any arbitrary time.
Synchronous Signal: exactly the same frequency as local clock, and fixed phase offset to that clock.
Mesochronous Signal: exactly the same frequency as local clock, but unknown phase offset.
Plesiochronous Signal: frequency nominally the same as local clock, but slightly different.

Mesochronous and plesiochronous concepts are very useful for the design of systems with long interconnections, and/or multiple clock domains.

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