Formal semantics for a subset of VHDL and its use in analysis of the FTPP scoreboard circuit

by Mark Bickford

Publisher: National Aeronautics and Space Administration, NASA Langley Research Center, Publisher: National Technical Information Service, distributor in Hampton, VA, [Springfield, Va

Written in English
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Edition Notes

StatementMark Bickford.
SeriesNASA contractor report -- 191577., NASA contractor report -- NASA CR-191577.
ContributionsLangley Research Center.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL17002117M

in terms of software and then use the synthesis tool to produce the desired hardware. The hardware language used in this research was VHDL, which provides a technology independent description of the electronic circuit. Synthesis represents an important activity in today’s digital design environment. I'm trying to use a VHDL configuration specification to pre-set This should be possible, as shown in IEEE, section , which gives the following example: entity AND_GATE is generic . The range may be any discrete range, e.g. an enumerated type: type PRIMARY is (RED, GREEN, BLUE); type COLOUR is ARRAY (PRIMARY) of integer range 0 to ; -- other statements MUX: process begin for SEL in PRIMARY loop V_BUS. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): We define a Plotkin-style structural operational semantics for a subset of vhdl that includes delta time, zero-delay scheduling and waits, arbitrary wait statements, and (commutative) resolution functions. While mosst.

The Conditional Signal Assignment statement is concurrent because it is assigned in the concurrent section of the architecture. It is possible to implement the same code in a sequential version, as we will see next. The conditional signal assignment statement is a process that assigns values to a signal. Chapter Three:VHDL Fundamentals I must create a system, or be enslav’d by another man’s; I will not reason and compare: my business is to create. “William Blake” VHDL Design Units One unique property of VHDL compared to other hardware languages is the concept of the Design units. Design capture and test tools have also already started to accept VHDL. Again, just a subset of the language is supported. So for each tool, there is usually a VHDL flavor. Tools, like analyzers, which just take a VHDL description, verify its correctness with respect to syntax and static semantics, and enter them into a VHDL design. The efficiency of VHDL allows a design to be implemented very quickly in a CPLD or an FPGA. VHDL allows for easy transition from a CPLD or FPGA design to an ASIC design. Many times the same VHDL code that was used in the CPLD or FPGA design is the same one implemented in an ASIC. Because VHDL is a well-defined.

A book called Learning By Example Using VHDL – Advanced Digital Design is being written to cover this material. Instead of chapters this book contains 49 worked examples ranging from basic digital components to datapaths, control units, and a microcontroller.   To further explore this design method, we’ll use the example of a least common multiple (LCM) algorithm implemented as a VHDL description. The Pseudocode of an LCM Algorithm. Listing 1 shows the pseudocode to find the LCM of m and n. Let’s assume that $$1 \leq m \leq 7$$ and $$1 \leq n \leq 7$$. Listing 1.

Formal semantics for a subset of VHDL and its use in analysis of the FTPP scoreboard circuit by Mark Bickford Download PDF EPUB FB2

Get this from a library. Formal semantics for a subset of VHDL and its use in analysis of the FTPP scoreboard circuit. [Mark Bickford; Langley Research Center.].

Formal semantics for a subset of VHDL and its use in analysis of the FTPP scoreboard circuit. By Mark Bickford. Abstract. In the first part of the report, we give a detailed description of an operational semantics for a large subset of VHDL, the VHSIC Hardware Description Language.

The semantics is written in the functional language Caliban Author: Mark Bickford. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): VHDL is frequently used for describing purely synchronous circuits.

However, the underlying model of VHDL is much more expressive than it need be. In this report, a synchronous subset of VHDL named ABC-VHDL is introduced. ABC-VHDL is dedicated towards logical argumentation and correct circuit synthesis based on VHDL.

This paper presents a formal model of several fundamental concepts in VHDL including the semantics of individual concurrent statements, and groups of those statements, resolution functions, delta. We present a mathematical definition of a hardware description language that admits a semantics-preserving translation to a subset of VHDL.

The language is based on the VHDL model of event-driven simulation and includes behavioral and structural circuit descriptions, the basic VHDL propagation delay mechanisms, and both zero and nonzero delays. It has been formally encoded in Cited by: Formal semantics for a subset of VHDL and its use in analysis of the FTPP scoreboard circuit.

we give a detailed description of an operational semantics for a large subset of VHDL, the VHSIC. VHDL Data Types: Scalar • VHDL is a strongly typed language (you cannot assign a signal of one type to the signal of another type) • Scalar Types • Bit – the only values allowed here are 0 or 1 • port (I 1,I 2: in bit; I 3: out bit) • Boolean – this type has two values: false (0) or true (1) • port (I 1,I 2: in bit; I.

eral form. Using this theory, the Synchronous VHDL subset is defined as the largest general subset of VHDL with a cycle-level abstraction. The observations in this paper build upon recently-reported results in the analysis of discrete-event semantics [14].

The additional new result reported here is a. eling. This will provide a feel for VHDL and a basis from which to work in later chap-ters. As an example, we look at ways of describing a four-bit register, shown in Figure Using VHDL terminology, we call the module reg4 a design entity, and the inputs and outputs are ports.

Figure shows a VHDL description of the interface to this entity. Formal semantics for a subset of VHDL and its use in analysis of the FTPP scoreboard circuit. Article. May ; Mark Bickford.

VHDL Semantics for Symbolic Model Checking Much research has been conducted to give a formal se-mantics to VHDL and apply formal verification techniques (see e.g.

[10, 2]). While there exist formal VHDL seman-tics in a number of formalisms, it is difficult to use many of these in formal verification. Many operational seman. of formal semantics (see, for example, the recent collection of papers [6] and [1, 2,7,14–18]).

As vhdl is a large language most of this research limits itself to subsets of vhdl, often ignoring essential features of the vhdlmodel of hardware, such as delta time, signal resolution, and the structural hierarchy.

In this work. This paper presents a formal semantics for a subset of VHDL that includes the basic control constructs, delta and unit delay signal assignment, variable assignment, and all forms of wait statements.

This paper gives operational semantics for a subset of VHDL in terms of abstract machines. Restrictions to the VHDL source code are the finiteness of data types, and the absence of quantitative timing informations.

The abstract machine of a design unit is built by composition of the abstract machines for its embedded processes and blocks. VHDL stands for VHSIC (Very High Speed Integrated Circuits) Hardware Description Language.

In the mid’s the U.S. Department of Defense and the IEEE sponsored the development of this hardware description language with the goal to develop very high-speed integrated circuit.

VHDL Cookbook First Edition Peter J. Ashenden. This is a set of notes I put together for my Computer Architecture clas s in Students had a project in which they had to model a micropr ocessor architecture of their choice. They used these notes to learn V HDL.

The notes cover the VHDL version of the language. Not all of. of formal semantics (see, for example, the recent collection of papers [6] and must point out that the semantics for our VHDL subset is based on VHDL87 [9] instead of VHDL93 [10]. respond to a active environment that can be interpreted as a program or circuit because, essentially, it is defined by changes it generates on input signals.

Both. Formal Semantics for VHDL is the first book that puts forward a cohesive set of semantics for the VHDL language. The chapters describe several semantics each based on a different underlying formalism: two of them use Petri nets as target language, and two of them higher order logic.

VHDL is a description language for digital electronic circuits that is used in di erent levels of abstraction. The VHDL acronym stands for VHSIC (Very High Spdee Integrated Circuits) Hardware Description Language. This means that VHDL can be used to accelerate the design process.

inputs, but the circuit shown below provides a more efficient implementation, since it uses the first exclusive-or gate to produce both of the output signals.

The signal assignments are only one part of a VHDL circuit specification. To completely define a circuit, we must also specify its inputs and outputs. Part of the Lecture Notes in Computer Science book series (LNCS, volume ) Abstract.

We define a Plotkin-style structural operational semantics for a subset of vhdl that includes delta time, zero-delay scheduling and waits, arbitrary wait statements, and (commutative) resolution functions.

While most of these features have been dealt with in. In this paper, we discuss how the VHDL semantics which represent the concepts of event-driven simulation and bus resolution function affect the test generation algorithm, and present methods of generating realistic tests without being affected by the VHDL semantics.

A formal representation of the VHDL process statement is described and the concept of event-driven simulation and its. Since NASA Langley Research Center has supported a formal methods research program. From its inception, a primary goal of the program has been to transfer formal methods technology into aerospace industries focusing on applications in commercial air transport.

The overall program has been described elsewhere. This paper gives an account of the technology transfer strategy and its evolution. Using VHDL, you can design, simulate, and synthesize anything from a simple combinational circuit to a complete microprocessor system on a chip. VHDL was standardized by the IEEE in (VHDL) and extended in (VHDL).

In this section we’ll a subset of. The VHDL Golden Reference Guide is a compact quick reference guide to the VHDL language, its syntax, semantics, synthesis and application to hardware design.

The VHDL Golden Reference Guide is not intended as a replacement for the IEEE Standard VHDL Language Reference Manual. Unlike that document, the Golden Reference guide does not offer a.

The logic synthesizer does its work simplifying the Boolean equations that come from your VHDL-RTL coding giving as result the 4-way mux we want to implement. Conclusion Every time we write a VHDL code to implement some hardware circuit, we need to pay attention to which VHDL instruction or construct is better to use.

VHDL stands for very high-speed integrated circuit hardware description language. It is a programming language used to model a digital system by dataflow, behavioral and structural style of modeling. This language was first introduced in for the department of Defense (DoD) under the VHSIC program.

The keyword ’all’ can be used, if all instances of a component shall be addressed. Within the for loop, the use statement selects the entity by specifying the absolute path to that object.

Unless explicitly changed, all VHDL objects are compiled into the library work. The architecture for. Design units and their analysis. Conventions. This page provides a summary of the syntax for the VHDL subset of CV.

Productions are ordered in order of appearance in the VHDL Language Reference Manual (LRM). The form of a production is described by means of a context-free grammar, using Backus-Naur notation (the following is lifted from the.

VHDL is frequently used for another purpose: Synthesis. Synthesis involves taking some higher level description down to a lower level description. For example - taking VHDL code and producing a netlist that can be mapped to an FPGA. In CSb we will be writing VHDL code to be synthesized and mapped down to a Xilinx Spartan2 FPGA.

Design Units in VHDL Object and Data Types entity Architecture Component Configuration Packages and Libraries An introduction to VHDL VHDL is a hardware description language which uses the syntax of ADA.

Like any hardware description language, it is used for many purposes. For describing hardware. As a modeling language.

For simulation of.Basic Logic Gates (ESD Chapter 2: Figure ) Every VHDL design description consists of at least one entity / architecture pair, or one entity with multiple architectures.

The entity section of the HDL design is used to declare the I/O ports of the circuit, while the description code resides within architecture portion. Standardized design libraries are typically used and are included prior to.VHDL Transport Delay Simulation Example.

The simulation is the same as the inertial delay. In this case the value of b follow the value of a after 20 ns even when a has a glitch of 10 ns. VHDL transport and inertial delay model allow the designer to model different type of behavior on VHDL .