Title :
Design Methods for Symmetric Function Generators Based on Threshold Elements
Author_Institution :
NTT Corp., Kyoto
Abstract :
This paper presents two design methods for threshold element (TE)-based symmetric function generators (SFGs). SFGs enable reconflgurable devices to be more economical by using fewer elements and configuration variables, as compared with lookup tables in conventional field-programmable gate arrays. The first method generates an SFG that consists of (n + 2) TEs and that utilizes (n + 1) configuration variables for any symmetric function of n input variables. The second method successfully reduces the number of TEs because it allows each TE to utilize more configuration variables. This SFG consists of {[29(n + 1)/3] + 1} TEs and utilizes [4(n + l)/3] configuration variables. There is a tradeoff between the number of TEs and configuration variables in these two SFGs. This tradeoff is discussed in relation to circuit performance.
Keywords :
function generators; logic design; network synthesis; threshold elements; circuit design methods; logic circuit; reconflgurable devices; symmetric function generators; threshold elements; CMOS technology; Circuit optimization; Circuit synthesis; Design methodology; Field programmable gate arrays; Input variables; Logic functions; Signal generators; Table lookup; Tellurium; Circuit design; function generator; lookup table (LUT); reconfigurable device; symmetric function; threshold element (TE); threshold function;
Journal_Title :
Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on
DOI :
10.1109/TCAD.2007.906472
