LPM Quick Reference Guide

LPM Quick Reference GuideDecember 1996 LPM FeaturesThe primary objecTIve for the LPM is to enable architecture-independentdesign without sacrificing efficiency. The LPM meets the following keycriteria:nArchitecture-independent design entry—Designers can work with LPMfuncTIons during design entry and verificaTIon without specifying thetarget architecture. Design entry and simulaTIon tools remainarchitecture-independent, relying on the synthesis or fitting tools toefficiently map the design to various architectures.nEfficient design mapping—The LPM allows designers to createarchitecture-independent designs without sacrificing efficiency. TheIC vendor is responsible for the mapping of LPM functions; thus,optimum solutions are guaranteed.nTool-independent design entry—The LPM enables designers to migratedesigns between EDA tools while maintaining a high-level logicdescription of the functions. For example, designers can use onevendor’s tool for logic synthesis and another vendor’s tool for logicsimulation.nSpecification of a complete design—LPM functions completely specifythe digital logic for any design. Designers can create new functionswith LPM functions.LPM FunctionsThe LPM presently contains 25 functions. Despite its small size, the LPMcan duplicate the functionality of other design libraries that contain manymore functions; each function contains parameters that allow it to expandin many dimensions. For example, thelpm_counterfunction allows theuser to create counters with widths ranging from 1 to 256 bits.In addition to width, the user can specify the features and functionality ofthe counter. For example, parameters indicate whether the counter countsup or down, or loads synchronously or asynchronously. Thus, the singlelpm_counterfunction can replace over thirty 74-series counters