Saber eUpdate January 2010  

Contents 


New – Saber Worst-Case Analysis
From systems to silicon, designers are using simulation to assure higher levels of reliability in their products. The December 2009 release of the Saber products features powerful new capability for performing Worst-Case Analysis on power electronic and multi-domain circuits, taking designers beyond the limitations of traditional WCA techniques. More

"The new Saber Worst-Case Analysis tool was instrumental in finding a worst-case in our circuit that previous methods had not identified. The WCA tool delivers highly valuable capabilities and is now part of my regular design reliability flow."         -Leonard Kelly, Sr. Staff Engineer

Read the full article


Getting a Grip on FlexRay, Part 2: Automated Analysis, Validation of Network Topologies
Abstract: The development and standardization of the FlexRay communication protocol has significantly evolved in the last few years. First production vehicles using FlexRay are now on the road. However, most of the automotive companies are still new to FlexRay and there is a lack of sufficient practical experience related to the new vehicle communication technology. Especially around the electrical physical layer of FlexRay, design systems engineers are struggling to build new systems that are robust and operate properly. The only viable method of early validation of a FlexRay network topology is through a virtual prototype using a simulation-based approach. This allows one to easily investigate new FlexRay systems early and possibly compare different concepts with regards to quality. In addition to the analysis of the nominal behavior, a virtual prototype can be applied to Worst Case analysis test benches – a significant benefit over a "hardware prototype only" approach.

To ensure that simulation models are addressing the needs for the simulation of FlexRay topologies however, it is mandatory to understand the basics of the electrical physical layer of FlexRay design systems. The first article in this two part series from Synopsys and NXP gives an overview on the important aspects and describes the simulation models and requirements that these need to fulfill. This article serves as an initial point for the second article, which will describe the simulation and validation methodology using the models described in part 1. Part 2 details the complete automated test scenario and outlines a standard validation methodology applied to automotive FlexRay network implementations.

Read the complete articles:
Getting a Grip on FlexRay, Part 1: Physical Layer Basics, Model Generation
Getting a Grip on FlexRay, Part 2: Automated Analysis, Validation of Network Topologies


What's New in the Saber 2009.12 Release?
The Saber 2009.12 release is now available for download on SolvNet. This release includes new analysis tools, usability enhancements, and quality improvements to the Saber Simulation, Saber Harness, and CosmosScope products.

Release highlights include:
  • Worst Case Analysis - An integrated test environment that uses search-based algorithms to find parameter combinations that cause in worst-case performance of a system. With the ability to efficiently handle system complexity that traditional WCA methods do not handle, the WCA Tool enhances the designer's ability to predict system reliability quickly and accurately.

    In addition, the WCA Tool is applicable for optimizing design performance and characterizing model behavior.

    Read the full WCA Tool article highlighted in this issue

  • New Parts Gallery Organization - Quick and intuitive browsing for Saber models by physical domain.
  • New Optimizer in Magnetic Component Tool - Allows fast and accurate characterization of B-H curve from measured data.
  • Shared Symbol Creation - New shortcuts for creating shared symbols from the selected originals.
  • Correct by Construction - New on-the-fly design checks for uniqueness in Saber Sketch and Saber Harness prevent users from inadvertently entering inconsistent data.
  • User Documentation - Enhanced and updated content in the Library Management User Guide and Model Architect User Guide.

Saber Sketch and Frameway users should note that Saber D-2009.12 enforces MAST 4.0 (OpenMAST) language rules more strictly. For more details, refer to the Saber 2009.12 Release Notes available on SolvNet.


Saber User Tip: Creating Saber Models from Simple Mathematical Expressions
Question:
How can I create a Saber model for a simple mathematical expression that describes my output as a function of the input? For example out=a*in*in+b (where a and b are constants).

Answer:
When you know the input or output function, you can use Saber's arbfun model. This article describes the process of using arbfun to create a control model with the function out=a*in*in+b and verify it in a test design.

Full article with screenshots

This and other Saber articles can be found on SolvNet. Not registered on SolvNet? Contact the Saber team for help today .