Summer training vhdl


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Summer training vhdl

  1. 1. THE WORLD OF VLSI & VHDLYesterday, Today & Tomorrow
  2. 2. The World of VLSI• History of the Integrated Circuit (IC) design• The IC Technologies
  3. 3.  History of the IC designIn 1947 Transistor was invented & demonstrated @ Bell Labs The first IC appeared in the market in 1961  ~14 years after the transistorFlip-flop:  2 transistors & resistorsCost  ~$100• The Silicon Technology is Growing... • Now on the same amount of Silica  ~500 times  faster operations 10 million transistors,  1/2 mile of interconnectCost few cents!!!  The Technology changes compared to the IC Design cycle
  4. 4. Moore’s Law In 1965, GardonMoore stated that the silicon technology will double the number of transistors on a chip every 2 years!!! And it is happening !!!!!!
  5. 5. The Search of products “How to reduce the high designing cost for future success of this technology ??? ”: 1968 Noyce  Reduce the cost of design process  Find product with large market-Regular structure, Many applications 1968 :Noyce, Moore & Grove Forms Intel !!SemiconductorMemory Chip
  6. 6. Microprocessor Technology Microprocessor = IC Tech +SoftwareProcessor Power+Memory capacity Software market
  7. 7. Advantages of VLSI ? Less AREA (compactness at system levels) Less POWERConsumption Less TESTING(more complex testing) Higher RELIABILITY(due to improved on-chip interconnects) Higher SPEED(due to reduced interconnect length) Significant COST SAVINGS
  8. 8. The goal of the IC designer Meet the market requirements  Satisfying customers need  Beating the competition Increasing performance or functionality of the product Reducing cost compared to the available solutions Achieved by:  Using next generation Silicon technologies  New design concepts & tools  High level of integration The Design is an optimization problem with parameters as Technology, Time, Cost and Customer requirements
  9. 9. Design Approaches Custom  full control of design  best results, slowest design time. Semi-custom (std cell)  use Cell libraries from vendor  cad tools, faster design time EPLA/EPLD -FPGA  Electrically Programmable (in the Field)
  10. 10. ASIC(Application Specific Integrated Circuit)  Implements custom functions according to description  Not off-the-shelf  Can be described in HDL (Verilog,VHDL)  in an abstract technology Independent fashion  Verified using a simulator  Analogous to software debugger  Constructed out of logical function cells  (AND,OR) and Re-Usable Macro  Building blocks (ADDERs, REGISTERs)  Mapped or translated using Synthesis products Implemented in  Field Programmable, Standard Cell or Gate Array families  For high volume production  Designers pay CAD vendors ~$50K -$500K for Design tools  Designer pay foundry( ~ $200K -.5M) and per part agreement
  11. 11. Field Programmable Gate Array A chip that can be configured by a user to implement different digital logic circuits Invented in 1984 FPGA building blocks:  Programmable logic blocks  Programmable interconnectField
  12. 12. To compress the digital world.To explore the hidden perfection and create the brain of a machine.*The above two are considered as a very difficulttasks in the field of electronics engineering, wherein fact it’s a very simple technology.
  13. 13.  VHDL is for coding models of a digital system. Reasons for modeling: ◦ Requirements specification ◦ Documentation ◦ Testing using simulation ◦ Formal verification ◦ Synthesis Goal: ◦ Most ‘reliable’ design process, with minimum cost and time ◦ Avoid design errors!
  14. 14.  VHDL is a programming language that allows one to model and develop complex digital systems in a dynamic environment. Object Oriented methodology for you C people can be observed -- modules can be used and reused. Allows you to designate in/out ports (bits) and specify behavior or response of the system.
  15. 15.  C is procedural language whereas VHDL is semi concurrent & semi sequential language. C is Case Sensitive whereas VHDL is case insensitive. There are some similarities, as with any programming language, but syntax and logic are quite different.
  16. 16. • Interfaces (PORTS)• Behavior• Structure• Test Benches• Simulation• Synthesis
  17. 17. DataflowBehavioralStructuralKind of BORING sounding huh??Well, it gets more exciting with the details !! :)
  18. 18. Uses statements that defines the actualflow of data..... such as, x <= y -- this is NOT less than equal to -- told you its not C this assigns the Boolean signal x to the value of Boolean signal y... i.e. x = y this will occur whenever y changes....
  19. 19. Entity declaration…(Describes the input/output ports of a module) entity name port names port mode (direction)entity reg4 is port ( d0, d1, d2, d3, en, clk : in bit; q0, q1, q2, q3 : out bit );end entity reg4; punctuation port typereserved words
  20. 20.  Architecture body  Describes an implementation of an entity  May be several per entity Behavioral architecture  Describes the algorithm performed by the module  Contains Process statements, each containing  Sequential statements, including Signal assignment statements and Wait statements
  21. 21.  Omit entity at end of entity declaration. Omit architecture at end of architecture body. Omit is in process statement header. entity reg4 is architecture behav of reg4 is port ( d0, d1, d2 : in bit begin d3, en, clk : in bit; process (d0, ... ) q0, q1, q2, q3 : out bit ... ); begin end reg4; ... end process ; end behav;
  22. 22.  Structural architecture  implements the module as a composition of subsystems  contains ○ signal declarations, for internal interconnections  the entity ports are also treated as signals ○ component instances  instances of previously declared entity/architecture pairs ○ port maps in component instances  connect signals to component ports
  23. 23.  An architecture can contain both behavioral and structural parts  Process statements and component instances ○ Collectively called concurrent statements  Processes can read and assign to signals Example: register-transfer-level (RTL) model  Data path described structurally  Control section described behaviorally
  24. 24. multiplier multiplicandshift_regcontrol_ shift_section adder reg product
  25. 25.  Testing a design by simulation Use a test bench model  A model that uses your model  Apply test sequences to your inputs  Monitors values on output signals  Either using simulator.  Or with a process that verifies correct operation  Or logic analyzer.
  26. 26.  Discrete event simulation  Time advances in discrete steps.  When signal values change—events occur. A processes is sensitive to events on input signals  Specified in wait statements.  Resumes and schedules new values on output signals. ○ Schedules transactions. ○ Event on a signal if value changes.
  27. 27. Initial Design Entry VHDL, Schematic, State Diagram Optimize Boolean Expression into a standard formLogic Optimization -To optimize area or speed Minimized BlocksTechnology Mapping -To minimize area Where the logic block is placed Placement ? -With optimum routing wire Connection between cells Routing -To minimize area. Used to configure the finalProgramming Unit circuit
  28. 28.  Implement the VHDL portion of coding for synthesis. Identify the differences between behavioral and structural coding styles. Distinguish coding for synthesis versus coding for simulation. Use scalar and composite data types to represent information. Use concurrent and sequential control structure to regulate information flow. Implement common VHDL constructs (Finite State Machines [FSMs], RAM/ROM data structures).
  29. 29. • Executable specification.• Functionality separated from implementation.• Simulate early and fast (Manage complexity)• Explore design alternatives.• Get feedback (Produce better designs)• Automatic synthesis and test generation (ATPG for ASICs)• Increase productivity (Shorten time-to-market)• Technology and tool independence.• Portable design data (Protect investment)
  30. 30.  Digital Signal Processing. IC Testing & Analysis. FPGA Design Verification. FPGA Development. Hardware Design. IC designing. ASIC Development.
  31. 31. • THANK YOU E-Mail•