Logic Design for Array-Based Circuits

Copyright © 1996, 2001, 2002 Donnamaie E. White

• Table of Contents
  
• Preface
  
• Overview
  
• Chapter 1 Introduction
• Chapter 2 Structured Design Methodology
• Chapter 3 Sizing the Design
• Chapter 3 Appendix = Case Study in Sizing a Design
• Chapter 4 Design Optimization
• Chapter 5 Timing Analysis for Arrays
  • Introduction
  • Path Propagation Delay Overview
  • Intrinsic Set-Up and Hold Time
  • Intrinsic Recovery Time
  • Set-up, Hold and Recovery Specifications
  • Maximum Operating Frequency; Toggle Frequency
  • Intrinsic Pulse Width
  • Interconnect Delays
  • Types of Extrinsic Loading
  • Annotation
  • Manual Computation - One Method
  • Example Equations for Extrinsic Loading - Internal Nets
  • Lnet - Front Annotation
  • Fan-In
  • Fan-Out - Lfo
  • WireOR - Lwo
  • k-Factors
  • Computing Lfo
  • Computing Lwo
  • Computing Lnet
  • Exercises
  • Example Equations for Extrinsic Loading - Output Nets
  • Q5000 Example (Front-Annotation)
  • Worst-Case Delay Multiplication Factors
  • Exercises
  • Front Annotation
  • Remedial Steps - When a Path is too slow
  • Intermediate Annotation
  • Remedial Steps - Intermediate Annotation
  • Back Annotation
  • Remedial Steps - Back-Annotation
  • Exercises
• Chapter 6 External Set-up and Hold Times
• Chapter 7 Power Considerations
• Case Study: DC Power Computation
• Case Study: AC Power Computation
• Chapter 8 Simulation
• Case Study: Simulation
• Chapter 9 Faults and Fault Detection
• Chapter 10 Design Submission
• ASIC Glossary
  • Glossary A-D
  • Glossary E-K
  • Glossary L-R
  • Glossary S-Z
  • Symbols

Timing Analysis for Arrays

Last Edit July 22, 2001

k-Factors

The k-factor for an internal macro output pin is the drive factor expressed in ns/LU (Load Units) that is used to convert the total net load units into time. As detailed above, load units are attributed to electrical fan-in loading, physical metal length loading and electrical wire-OR loading. Within an array series, the k-Factors vary by macro option and by edge direction. Examples are shown in Table 5-3 for the Q5000 Series (bipolar) and the Q20000 Series (high-speed bipolar) arrays.

Table 5-3a Example K-Factors - Option Specific *

* Q5000 Library, internal macros, typical values

Table 5-3b Example Com5max Library K-Factors For The AMCC Q20000 Series
k_fo = k_net; k_cap**

** Individual macro k-factors are specified in the macro library documentation in the AMCC Q20000 Design Manual, Volume I, Section 6. Units are min/max spread for the Commercial 5V library only.

Copyright @ 2001, 2002 Donnamaie E. White, White Enterprises
For problems or questions on these pages, contact dew@Donnamaie.com