Hardware Description Languages. Introduction to VHDL
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1 Hardware Description Languages Introduction to VHDL 1
2 What does VHDL stand for? VHSIC (= Very High Speed Integrated Circuit) Hardware Description Language 2
3 Others HDL VHDL IEEE Std Verilog IEEE Std Super Verilog SystemC SpecC 3
4 History of VHDL Designed as part of the DoD funded VHSIC program Standardized by the IEEE in 1987: IEEE Enhanced in 1993: IEEE Standardized packages provide common definitions of data types, operators, and timing IEEE 1164 (data types) IEEE (numeric) IEEE (timing) 4
5 HDLs vs. Software Languages Concurrent (parallel) Statements vs. Sequential Statements 5
6 Digital System Design Flow The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. Requirements The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. Functional Design Register Transfer Level Design The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. Logic Design The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. Circuit Design The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. Physical Design Description for Manufacture Design flows operate at multiple levels of abstraction Need a uniform description to translate between levels Increasing costs of design and fabrication necessitate greater reliance on automation via CAD tools $5M - $100M to design new chips Increasing time to market pressures 6
7 The Y-Diagram Paradigm Design is structured around a hierarchy of representations HDLs can describe distinct aspects of a design at multiple levels of abstraction 7
8 HDL Abstractions Descriptions can be at different levels of abstraction Switch Level: model switching behavior of transistors Structural Level: model connectivity among components Register Transfer Level: model combinational and sequential logic components Behavioral Level: model the functional behavior of systems and subsystems 8
9 Levels of Abstraction Abstraction Gate Level RTL RT Level (Module) RTL SW System Level Circuit Level
10 Design Abstraction Levels 10
11 Role of HDLs V Very High Speed Integrated Circuit H Hardware D Description L Language System description and documentation System simulation System synthesis 11
12 Role of HDLs Design Specification unambiguous definition of components, functionality and interfaces Design Simulation verify system/subsystem performance and functional correctness prior to design implementation Design Synthesis automated generation of a hardware design 12
13 HDL Benefits Interoperability: models at multiple levels of abstraction Technology independence: portable model Design re-use and rapid prototyping Cost reduction Higher Level of Abstraction (hiding details) The design task become simpler The design is less error prone Productivity is increased 13
14 The Marketplace More than 30% of a car cost is in Electronics 14
15 Design Productivity Gap Designers rely increasingly on design automation software tools: to seek productivity gains to cope with increased complexity In 1965 Intel co-founder Gordon Moore predicted that IC transistor capacity would double every 18 months: no other technology has grown so fast so long 15
16 Design Productivity Gap Transistors have consistently become smaller, faster, consume less power, and are cheaper to manufacture Transistor count is not the only factor that has grown exponentially Memory capacity is doubling almost every 1.5 years Processor performance is improving times per year 16
17 The Marketplace From V. K. Madisetti and T. W. Egolf, Virtual Prototyping of Embedded Microcontroller Based DSP Systems, IEEE Micro, pp. 9 21, Time to market delays have a substantial impact on product revenue First 10%-20% of design cycle can determine 70%-80% of the cost Costs are rising rapidly with each new generation of technology Need standards and re-use automation centered around HDL based tools 17
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