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JOURNALS // Sistemy i Sredstva Informatiki [Systems and Means of Informatics] // Archive

Sistemy i Sredstva Inform., 2019 Volume 29, Issue 3, Pages 104–113 (Mi ssi658)

Sequential self-timed cell characterization

Yu. A. Stepchenkov, Yu. G. Diachenko, N. V. Morozov, D. Yu. Stepchenkov, D. Yu. Diachenko

Institute of Informatics Problems, Federal Research Center "Computer Science and Control" of the Russian Academy of Sciences, 44-2 Vavilov Str., Moscow 119133, Russian Federation

Abstract: Functional specificity of the self-timed circuits makes special requirements to their characterization procedure. This procedure should take into account a signal conditioning discipline for information and phase signals on base of user defined attributes of the characterized cell's inputs and outputs. The paper describes a technique of adjusting characterization process for sequential self-timed cells. It is based on using vectors that set static values and transition direction for all inputs and outputs. Algorithmization and implementation of the suggested approach in new SAHIB characterization system version have increased its efficiency and provided the valid characterization of all sequential cell types in the self-timed cell library for 65-nanometer standard CMOS (complementary metal-oxide-semiconductor) process. Automatic introduction of the Verilog constructions analyzing change order of all cell inputs and notifying their invalid sequence into the sequential cell models during characterization procedure accelerates and mitigates self-timed circuit design.

Keywords: self-timed circuit, timing parameters, characterization, simulation, sequential cell, initial state.

Received: 07.08.2019

DOI: 10.14357/08696527190309



© Steklov Math. Inst. of RAS, 2024