Design Methodology EMT 251 Chapter 8: page 425.

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Presentation transcript:

Design Methodology EMT 251 Chapter 8: page 425

VLSI Design Methodology Silicon Foundry IC Design Team CAD Tool Provider Design Rules Simulation Models and parameters Mask Layouts Integrated circuits (IC) Process Information Software Tools Relationship between a silicon foundry, an IC design team and a CAD tool provider

Top Down (algorithm) Bottom Up (physical)

Application Specific Integrated Circuits (ASICs) IC Standard IC ASSPs ASIC Programmable IC Semi Custom IC Custom IC FPGA Gate Array Linear Array Standard Cells Full Custom IC ASSPs : Application Specific Standard Products

ASIC Design Methodologies ASIC Design Methodology This approach is extremely slow, expensive It is only used to design very high performance systems Full-custom design This approach is reasonable fast, less expensive Most ASICs are currently designed using this method Standard-cell based design This approach is fast and less expensive ASIC performance are relatively slow Gate-array The design process is very fast and cost effective ASIC performance are slow FPGA based

Comparison of CMOS design method Non recurring Engineering Unit Cost Power Dissipation Complexity of Implementation Time to market Performance Flexibility Microprocessor/DSP Low Medium High PLA FPGA Gate Array/ SOG Cell Based Custom Design Very high Platform based NRE – page 483

ASIC-Benefit • Improve performance • Reduce power consumption • Mix Analog and Digital Designs • Design optimization through IC manufacturing process • Development Tools support HDL and Schematic design approach

ASIC-Drawbacks • Inflexible design • Deployed systems can not be upgraded • Mistakes in product development are costly • Updates requires a redesign • Complex and expensive development tools

POP QUIZ

THE END