TheIDT7203/7204/7205/7206aredual-portmemorybufferswithinternalpointersthatloadandemptydataonafirstin/first-outbasis.ThedeviceusesFullandEmptyflagstopreventdataoverflowandunderflowandexpansionlogictoallowforunlimitedexpansioncapabilityinbothwordsizeanddepth.