Advanced Fly-By Routing Topology for Gbps DDR5 Systems

Abstract

From DDR3 and beyond, the fly-by has been widely used as it can support high data rate operations by providing smaller trace stubs and capacitive loadings. Even so, beyond a certain number of loadings, the fly-by also starts to have trouble in keeping up with high data rates. To accommodate larger loadings, either data rate needs to be reduced or advanced equalization techniques are required. To address this limitation of fly-by topology, we propose advanced fly-by topology routing.