Publ. pedagógica LEONARDO DfDTT:

Sumário:

This document contains the materials for the Training Action (TA) Design for Debug and Test Techniques, which is part of the Design for Debug and Test (DfDT) module within workpackage 2 of the Leonardo INSIGHT II project. The objective of this TA consists of presenting several DfDT techniques based on the IEEE 1149.1 Standard. The materials presented in TA2 (Techniques for Prototype Debugging and Validation) and TA3 (Design for Test Standards and Proposed Standards) are first summarised and combined to provide an extensive analysis on the potential benefits of using both the basic and optional modes of the Boundary Scan Test (BST) infrastructure for implementing the debug operations identified in TA2. The optional modes are covered in two hierarchy levels: the chip level, where optional instructions defined by the standard are considered, and the board level, where commercial available components with enhanced debug and test features are considered. The requirements for additional 1149.1 features for improved prototype debugging are finally discussed, leading to a set of new optional BST instructions.

Índice:

1 - INTRODUCTION

2 - DEBUGGING MODES /OPERATIONS

The debug model: basic debug operation types 
State control / observation / verification 
    Pin level 
    Register level 
    Gate level
Single step 
Breakpoint 
    BP condition types
    BP condition evaluation
    Stopping the system
Real-time analysis
    RT acquisition
    Cycle-stretch 
    Observation of time delays 

3 - IEEE 1149.1: BASIC AND OPTIONAL OPERATING MODES

Mandatory BST instructions
    EXTEST 
    SAMPLE/PRELOAD
    BYPASS
Optional public / private BST instructions
    INTEST 
    RUNBIST 
    CLAMP 
    IDCODE / USERCODE
    HIGHZ
    Other private / public user-defined instructions
COTS with enhanced debugging characteristics
    PROBE 
    SCOPETM and SCANTM families 
    Digital Bus Monitor

4 - DEBUGGING THROUGH 1149.1 BASIC OPERATING MODES

State COV operations
Single step 
Breakpoint
Real time analysis

5 - OPTIONAL MODES: ENHANCED DEBUGGING PROCEDURES

State COV operations
Single step
Breakpoint 
Real time analysis

6 - ADDITIONAL 1149.1 FEATURES FOR IMPROVED DEBUGGING

State COV operations
Single step 
Breakpoint 
Real time analysis

7 - CONCLUSION

BIBLIOGRAPHY