A practical approach to multiple-class retiming
Klaus Eckl, J.C. Madre, Peter Zepter, Christian Legl · 1999
Retiming is an optimization technique for synchronous circuits introduced by Leiserson and Saxe in 1983.Although powerful, retiming is not very widely used because it does not handle in a satisfying way circuits whose registers have load enable, synchronous and asynchronous set/clear inputs.We propose an extension of retiming whose basis is the characterization of registers into register classes.The new approach called multiple-class retiming handles circuits with an arbitrary number of register classes.We present results on a set of industrial FPGA designs showing the effectiveness and efficiency of multiple-class retiming.