Hardware/Software Introduction Chapter 1 Introduction

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The mythical man-month • The situation is even worse than the productivity gap indicates • In theory, adding designers to team reduces project completion time • In reality, productivity per designer decreases due to complexities of team management and communication • In the software community, known as “the mythical man-month” (Brooks 1975) • At some point, can actually lengthen project completion time! (“Too many cooks”) • 1M transistors, 1 designer=5000 trans/month • Each additional designer reduces for 100 trans/month • So 2 designers produce 4900 trans/month each 60000 50000 40000 30000 20000 10000 43 Team 16 15 16 19 18 24 23 Months until completion Individual 0 10 20 30 40 Number of designers Embedded Systems Design: A Unified Hardware/Software Introduction, (c) 2000 Vahid/Givargis 32
Summary • Embedded systems are everywhere • Key challenge: optimization of design metrics – Design metrics compete with one another • A unified view of hardware and software is necessary to improve productivity • Three key technologies – Processor: general-purpose, application-specific, single-purpose – IC: Full-custom, semi-custom, PLD – Design: Compilation/synthesis, libraries/IP, test/verification Embedded Systems Design: A Unified Hardware/Software Introduction, (c) 2000 Vahid/Givargis 33
Page 1 and 2: Embedded Systems Design: A Unified
Page 3 and 4: Embedded systems overview • Embed
Page 5 and 6: Some common characteristics of embe
Page 7 and 8: Design challenge - optimizing desig
Page 9 and 10: Design challenge - optimizing desig
Page 11 and 12: Time-to-market: a demanding design
Page 13 and 14: Losses due to delayed market entry
Page 15 and 16: The performance design metric • W
Page 17 and 18: Processor technology • The archit
Page 19 and 20: General-purpose processors • Prog
Page 21 and 22: Application-specific processors •
Page 23 and 24: Full-custom/VLSI • All layers are
Page 25 and 26: PLD (Programmable Logic Device) •
Page 27 and 28: Graphical illustration of Moore’s
Page 29 and 30: The co-design ladder • In the pas
Page 31: Design productivity gap • 1981 le
Page 35 and 36: Ch3. GPP: Software Summary • Gene
Page 37 and 38: Ch7. Digital Camera Example Summary
Page 39 and 40: Embedded Systems Design: A Unified
Page 41 and 42: Introduction • Design task - Defi
Page 43 and 44: Automation: synthesis • Early des
Page 45 and 46: Increasing abstraction level • Hi
Page 47 and 48: Gajski’s Y-chart • Each axis re
Page 49 and 50: Two-level minimization • Represen
Page 51 and 52: Minimum cover: K-map approach • K
Page 53 and 54: Minimum cover: heuristics • K-map
Page 55 and 56: Example • Minimized 2-level logic
Page 57 and 58: Technology mapping • Library of g
Page 59 and 60: Integrating logic design and physic
Page 61 and 62: Behavioral synthesis • High-level
Page 63 and 64: System synthesis • Tasks (cont.)
Page 65 and 66: Temporal vs. spatial thinking • D
Page 67 and 68: Verification • Ensuring design is
Page 69 and 70: Simulation • Create computer mode
Page 71 and 72: Advantages over physical implementa
Page 73 and 74: Simulation speed • Relative speed
Page 75 and 76: Reducing precision/accuracy • Don
Page 77 and 78: Integrating GPP/SPP simulations •
Page 79 and 80: Emulators • General physical devi
Page 81 and 82: Reuse: intellectual property cores
Page 83 and 84:
Advantages/disadvantages of hard co
Page 85 and 86:
New challenges to processor provide
Page 87 and 88:
New challenges to processor users
Page 89 and 90:
Waterfall method • Not very reali
Page 91 and 92:
General-purpose processor design mo
Page 93 and 94:
Summary • Design technology seeks
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