Podcast
Questions and Answers
VHDL must undergo a review process every ______ years to ensure its ongoing relevance to the industry.
VHDL must undergo a review process every ______ years to ensure its ongoing relevance to the industry.
5
The first revision of VHDL was completed in September ______.
The first revision of VHDL was completed in September ______.
1993
VHDL-2002 is a minor revision of VHDL ______.
VHDL-2002 is a minor revision of VHDL ______.
2000
One of the features introduced in VHDL-1993 was ______ variables.
One of the features introduced in VHDL-1993 was ______ variables.
The VHPI allows tools programmable access to a VHDL model before and during ______.
The VHPI allows tools programmable access to a VHDL model before and during ______.
The next revision of VHDL was released in January ______ and is referred to as 'VHDL2008'.
The next revision of VHDL was released in January ______ and is referred to as 'VHDL2008'.
VHDL 2000 Edition includes the addition of ______ types.
VHDL 2000 Edition includes the addition of ______ types.
The year when all rights of VHDL were transferred to ______ was 1986.
The year when all rights of VHDL were transferred to ______ was 1986.
HDL stands for Hardware ______ Language.
HDL stands for Hardware ______ Language.
To use an HDL, you need a CAD system that supports it, with major CAD systems supporting ______, Verilog, System C, System Verilog.
To use an HDL, you need a CAD system that supports it, with major CAD systems supporting ______, Verilog, System C, System Verilog.
The development of VHDL was initiated in 1981 by the United States Department of ______ to address the hardware life cycle crisis.
The development of VHDL was initiated in 1981 by the United States Department of ______ to address the hardware life cycle crisis.
The standardization process for VHDL sought participation and feedback from ______ at an early stage.
The standardization process for VHDL sought participation and feedback from ______ at an early stage.
A baseline language (version ______) was published 2 years before the standard.
A baseline language (version ______) was published 2 years before the standard.
DoD Mil Std 454 mandates the supply of a comprehensive VHDL description with every ______ delivered to the DoD.
DoD Mil Std 454 mandates the supply of a comprehensive VHDL description with every ______ delivered to the DoD.
The cost of reproducing electronic hardware was reaching crisis point due to inadequate ______ of the parts.
The cost of reproducing electronic hardware was reaching crisis point due to inadequate ______ of the parts.
The best way to provide the required level of description in the design process is to use ______ throughout.
The best way to provide the required level of description in the design process is to use ______ throughout.
Flashcards are hidden until you start studying
Study Notes
Hardware Description Language (HDL)
- HDL is used for describing hardware for documentation, simulation, synthesis, verification, and related purposes.
- Requires a Computer-Aided Design (CAD) system that supports it.
- Major CAD systems supporting HDL include VHDL, Verilog, System C, and System Verilog.
- Notable CAD systems:
- Cadence – Incisive
- Mentor Graphics – ModelSim, Questa
- Altera and XILINX (arrangement to use ModelSim)
- Synopsys – Focused on synthesis and ASIC production from HDL descriptions.
HDL History and Background
- Requirement: VHDL development began in 1981 by the U.S. Department of Defense to combat the hardware life cycle crisis due to inadequate documentation and the use of incompatible simulation tools.
- Standardization: Early industry feedback shaped VHDL's standardization process; the baseline version was released two years before the final standard.
- ASIC Mandate: DoD Mil Std 454 requires comprehensive VHDL descriptions for every ASIC delivered, promoting VHDL throughout the design process.
VHDL Revisions
- VHDL 1993: First IEEE review completed in 1993, remains the most supported version of VHDL.
- VHDL 2000: Introduced protected types to resolve issues with shared variables from VHDL 1993.
- VHDL 2002: A minor update relaxing buffer port usage rules, enhancing their usefulness.
VHPI and Further Revisions
- VHPI (2007): Introduced a procedural interface allowing programmable access to VHDL models during simulation without adding new features.
- VHDL 2008: Released in January 2009, marks the following comprehensive revision of VHDL.
Timeline of VHDL History
- 1981: Initiation by U.S. DoD for hardware life-cycle crisis.
- 1983-85: Development of the baseline language by Intermetrics, IBM, and TI.
- 1986: Rights transferred to IEEE.
- 1987: Publication of IEEE Standard and Mil Std 454 requiring VHDL descriptions with ASICs.
- 1994: First revision leading to VHDL 1076-1993 standard.
- 2000: Release of VHDL 1076-2000, Edition.
- 2002: Updated VHDL 1076-2002 standard.
- 2007: VHDL 1076c-2007 introduces VHPI.
- 2009: Release of VHDL 1076-2008 as a revised standard.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
