我的项目 TableOfContents 看看我都做了些什么
现在的项目
项目概述
建立一个嵌入式控制器芯片(SoC)的功能验证环境。这个芯片有embedded java processor，采用wishbone总线结构。
验证策略
constraint random
coverage driven
code coverage
functional coverage
利用PSL中的cover来统计control based functional coverage
assertion based
用PSL作为assertion language。Simulation-Based ABV and FA are complementary technologies. Assertions written for use in FA can be also checked in simulation. Conversely, assertions written for use in simulation-based ABV can be used in FA. Other tools, such as emulation, may also be able to check the same assertions.
Technologies and Tools
- Simulator采用Cadence的IUS54
- Debugger采用Novas的Debussy 5.4v7。
- Code Coverage analysis采用Cadence的Incisive Coverage Tool, 也就是hdlscore。
- Formal Verification -- Synopsys的Formality有人反映不是很稳定，前些日子看到Cadence推出了Incisive Formal Verifier，很感兴趣，现在正在尝试如何将这个tool apply到项目里面来。
- Emulation -- 这个项目里面采用了S2C公司的IPPorter，但是效果不是很好，姑且当作一个FPGA prototyping board来用吧！
验证环境
drawing:verif
Coverage Metrics
Code coverage analysis is mandatory in this project. Block/Path/Expression coverage are analysed. FSM coverage data is not analysed in this stage.
Functional Coverage is a relatively new concept in this project, so this coverage data collection and analysis is optional for each IP.
Regression
A seperate script written in python is used for regression. This script has the ability to run all of the test cases in a list file, and then generate a report summary file.
软硬件协同验证(Co-Verification)
很想拥有mentor的seemless，可是我没有。只好自力更生，自己开发一个co-verification的环境出来。BR drawing:mytest BR 上图中terminal是一个用python开发出来的Command Line Interface(CLI)。它可以将处理器的程序编译成为二进制代码后通过Socket Inter Process Communication传送给仿真环境，仿真环境将接收来的数据作为UART的输入数据，芯片内置的firmware将通过UART接收来的程序数据放置到预先设定的RAM空间，然后再跳转到该空间开始执行相应的程序。当FPGA prototyping和它连接时，则需要将连接的方式改为PC的串口。BRBR 这样一个系统的优点是在芯片硬件开发的同时，driver/diagnostic/application软件可以并行开发，而不是必须等待FPGA board ready or real chip back，another advantage is that we can have almost unlimited copies of this development environment in simulation instead of limited copies of FPGA board which sometimes restricted us to put more human resources into the software development when it becomes the critical path of the whole project.
项目管理
cvs is adapted for revision control，Rational ClearQuest is adapted as issue/bug tracking tool