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VHDL

VHDL. Fő témakörök : VHDL-en alapuló áramkörtervezés VHDL alapok Fejlett VHDL nyelvi szerkezetek Áramköri példák. Viselkedési. Szerkezeti. Process zorok, memóriák. Sorrendi programok. Regis z ter ek , multiplexerek. Regis z ter átvitelek. Kapuk , flip-flop ok.

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VHDL

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  1. VHDL Fő témakörök: • VHDL-en alapuló áramkörtervezés • VHDL alapok • Fejlett VHDL nyelvi szerkezetek • Áramköri példák

  2. Viselkedési Szerkezeti Processzorok, memóriák Sorrendi programok Regiszterek, multiplexerek Regiszter átvitelek Kapuk, flip-flopok Logikai egyenletek/FSM Tranzisztorok Átviteli függvények Cellalayout Modulok Chipek Kártyák Fizikai Gajski Y-diagrammja Az egyes tengelyek leírási típusokat képviselnek • Viselkedési • A bemenetek függvényében meghatározza a kimeneteket • Algoritmus, de nem megvalósítás • Szerkezeti • Megvalósítja a viselkedést az ismert viselkedésű összetevők összekötésével • Fizikai • Megadja a chipbeli összetevők és vezetékekméretété és elhelyezését • A tervezési folyamatot utazási útvonallal lehet ábrázolni

  3. A VHDL története • VHDL originated in the early 1980s • It is now accepted as one of the most important standard languages for • specifying • verifying • designing of electronics

  4. Tesztvektor generátor Végrehajtható előírás Eredmények, hibák = Finomított modellek sorozata Teszt-vektorok VégsőchipModell VHDL szimulációhoz & szintézishez

  5. VHDL szimulációhoz & szintézishez VHDL requirements for Simulation • Creation of testbenches => • File I/O • Detection of errors (function & timing) • Multiple simultaneous models • Combination of low & high level models (for efficiency)

  6. VHDL szimulációhoz & szintézishez VHDL requirements for HW Description • Behavioral models => • Combinatorial & Sequential Logic • RTL models • Structural models • Timing models

  7. VHDL szimulációhoz & szintézishez Requirements for VHDL Synthesis Tools • Pre- & post synthesis behavior should be identical • Synthesis should be efficient => • Requires interaction with place & route tools • Logic Synthesis • FSM Synthesis • Area & Timing Optimization

  8. Szabványosítás 1 • VHDL is an acronym of VHSIC Hardware Description Language • VHSIC is an acronym of Very High Speed Integrated Circuits • All the major tool manufacturers now support the VHDL standard • VHDL is now a standardized language, with the advantage that it it easy to move VHDL code between different commercial platforms (tools) => VHDL code is interchangeable among the different tools

  9. Szabványosítás 2 • It was the American Department of Defense which initiated the development of VHDL in the early 1980s because the US military needed a standardized method of describing electronic systems • VHDL was standardized in 1987 by the IEEE • IEEE Std-1076-1987 • ANSI Standard in 1988 • Added Support for RTL Design • VITAL: VHDL Initiative Towards ASIC Library • Revised version in 1993 • IEEE Std-1076-1993

  10. Szabványosítás 3 • 1995: • numeric_std/bit: IEEE-1076.3 • VITAL: IEEE-1076.4 • 1999: IEEE-1076.1 (VHDL-AMS ) • 2000: • IEEE-1076-2000 • IEEE-1076.1-2000 (VITAL-2000, SDF 4.0) • Added mixed-signal supportto VHDL in 2001 -> • VHDL-AMS • IEEE Std-1076.1-2001 • 2002: IEEE-1076-2002

  11. Tervezőeszközök • Good VHDL tools, and VHDL simulators in particular, have also been developed for PCs • Prices have fallen dramatically, enabling smaller companies to use VHDL, too • There are also PC synthesis tools, primarily for FPGAs and EPLDs

  12. Használat • High-tech companies • Texas Instruments, Intel use VHDL • mostEuropean companies use VHDL • Universities • VHDL groups to support new users

  13. IEEE • IEEE is the Institute of Electrical and Electronics Engineers • The reference manual is called IEEE VHDL Language Reference Manual Draft Standard version 1076/B • It was ratified in December 1987 as IEEE 1076-1987 • Important: the VHDL is standardized for system specification but not for design

  14. Technológia-függetlenség • The design of VHDL components can be technology-independent or more-or-less technology independent for a technical family • The components can be stored in a library for reuse in several different designs • VHDL models of commercial IC standard components can now be bought, which is a great advantage when it comes to verifying entire circuit boards

  15. Analóg világ • VHDL has not yet been standardized for analog electronics • Standardization is in progress on VHDL with an analog extension (AHDL) to allow analog systems to be described as well • This new standard will be based wholly on the VHDL standard and will have a number of additions for describing analog functions

  16. VHDL-Related Newsgroups • comp.arch.fpga • comp.lang.vhdl • comp.cad.synthesis

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