Hardware/Software Co-Design of Complex Embedded Systems: An Approach Using Efficient Process Models, Multiple Formalism Specification and Validation via Co-Simulation

This paper presents a hardware/software co-design approachwhere different specification languages can be used in parallel, allowingeffective system co-modeling. The proposed methodology introduces a processmodel that extends the traditional spiral model so as to reflect the designneeds of modern embedded systems. The methodology is supported by an advancedtoolset that allows co-modeling and co-simulation using SDL, Statecharts andMATRIXX, and interactive hardware/software partitioning. The effectivenessof the proposed approach is exhibited through two applicati on examples: thedesign of a car window lift mechanism, and the design of a MAC layer protocolfor wireless ATM networks

A hardware/software co-design methodology for embedded telecommunication systems

International audienceThe current paper presents an integrated co-design methodology for embedded telecommunication systems, starting from high-level system modelling down to system implementation. The proposed co-design methodology uses a system specification captured in UML language, translates at a simulatable SDL description used as input to the COSMOS toolset for the generation of a virtual hardware/software prototype. The system's partitioning is achieved interactively in a semi-automatic way, based on COSMOS and its underlying SOLAR format, producing C and VHDL descriptions for the implementation of software and hardware parts respectively. For the co-simulation, synthesis and system implementation parts of the proposed methodology, the CoWare tool has been employed using as front end the generated C and VHDL descriptions produced by COSMOS. The effectiveness of the proposed co-design approach is demonstrated through its application for the design and implementation of the Medium Access Control (MAC) layer and the RF I/F part of the Physical (PHY) layer of the DECT protocol stack

Hardware/software co-design of embedded systems using multiple formalisms for application development

International audienceIn this paper a co-design methodology based on multiformalism modeling is presented. It defines a platform that integrates different notations and, the necessary mechanisms to handle different in nature models in a coherent way. The supported formalisms cover a wide area of application domains, allowing the designer to select the notations that are mostly appropriate for his application. The proposed co-design development cycle provides a full blown path from system specification to a virtual prototype of the system under construction. Its effectiveness is depicted through its use for the design and implementation of a MAC layer protocol, named MASCARA, for providing ATM QoS over wireless connections

ACCELERATION 1/F NOISE IN SILICON MOSFETs

It is usually assumed that the 1/f noise in Si-MOSFETs is limited by collision 1/f noise. We found this to be the case for devices with relatively short channel lengths (L<10µm) but for channels of intermediate length (10µm<L<194µm) we found that the Hooge parameter varies as L2. We attributed this to acceleration of the electrons by the applied field, accompanied by Bremsstrahlung emission and current 1/f noise generation. This is a new noise source

Electronic distortion compensation in the mitigation of optical transmission impairments: The view of joint project on mitigation of optical transmission impairments by electronic means ePhoton/ONe+ project

The key design approaches and results in the field of compensation of optical impairment distortion by electronic means, as an outcome of the studies and research innovations developed within the joint project on mitigation of optical transmission impairments by electronic means work group of the ePhoton/ONe+ European project are presented. The research topics addressed are related to chromatic and polarisation mode dispersion, with particular reference to feed-forward/decision-feedback equaliser and maximum-likelihood sequence estimation-based equalisers as well as pre-distortion schemes. Additionally, the use of electronic compensation in metro/access applications is examined with reference to studies related to the performance enhancement of directly modulated laser transmitters, the compensation of the square-law characteristics of receivers and the equalisation of multi-level format schemes. © The Institution of Engineering and Technology 2009

Electronic distortion compensation in the mitigation of optical transmission impairments: the view of joint project on mitigation of optical transmission impairments by electronic means ePhoton/One+ project

The key design approaches and results in the. field of compensation of optical impairment distortion by electronic means, as an outcome of the studies and research innovations developed within the joint project on mitigation of optical transmission impairments by electronic means work group of the ePhoton/ONe+ European project are presented. The research topics addressed are related to chromatic and polarisation mode dispersion, with particular reference to feed-forward/decision-feedback equaliser and maximum-likelihood sequence estimation-based equalisers as well as pre-distortion schemes. Additionally, the use of electronic compensation in metro/access applications is examined with reference to studies related to the performance enhancement of directly modulated laser transmitters, the compensation of the square-law characteristics of receivers and the equalisation of multi-level format schemes