标签: cmi

基于FPGA的CMI编解码设计

TheDallasSemiconductorDS2155orDS21455single-chiptransceiver(SCT)canbeusedtocreateaninterfacethatiscompatiblewiththeJapaneseJJ-20.11standard.BoththeDS2155andDS21455haveadigitalmultiplexerandI/OinterfacethatprovideaccesstotheclockandbipolardatasignalsbetweentheframerandLIUsections.UsingaFPGAorCPLD,thedatasteamcanbemodifiedtosupporttheJJ-20.11standard.BecausetheLIUalreadyhastheabilitytocodeanddecodetheCodedMarkInversion(CMI)signalusedinJJ-20.11,onlyaslightmodificationisneededtoincreasethegainofthereceivesignal.……