By Larry M. Augustin, David C. Luckham, Benoit A. Gennart, Youm Huh, A. Stanculescu
ISBN-10: 1461368081
ISBN-13: 9781461368083
ISBN-10: 1461540429
ISBN-13: 9781461540427
The VHSIC Description Language (VHDL) presents a typical computing device processable notation for describing undefined. VHDL is the results of a collaborative attempt among IBM, Intermetrics, and Texas tools; subsidized through the Very excessive velocity built-in Cir cuits (VHSIC) software place of work of the dept of security, starting in 1981. at the present time it's an IEEE commonplace (1076-1987), and several other simulators and different automatic help instruments for it can be found commercially. by means of delivering a typical notation for describing undefined, specially within the early phases of the layout technique, VHDL is predicted to minimize either the time lag and the price fascinated by construction new platforms and upgrading current ones. VHDL is the results of an evolutionary method of language devel opment beginning with excessive point description languages present in 1981. It has a decidedly programming language style, ensuing either from the orientation of languages of that point, and from a ma jor requirement that VHDL use Ada constructs anyplace applicable. in the course of the 1980's there was an expanding present of analysis into excessive point specification languages for structures, relatively within the software program zone, and new tools of using necessities in platforms de velopment. This job is around the world and contains, for instance, item orientated layout, numerous rigorous improvement tools, mathematical verification, and synthesis from excessive point requirements. VAL (VHDL Annotation Language) is a straightforward extra step within the evolution of description languages towards employing new equipment that experience constructed for the reason that VHDL used to be designed.
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Additional info for Hardware Design and Simulation in VAL/VHDL
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5 Generate The generate statement creates a set of processes differing only in a single parameter. The syntax of a VAL generate statement is the same as that of the VHDL generate statement: CHAPTER 2. AN OVERVIEW OF VAL 30 for identifier in range generate statement list end generate; Semantically, the result of a generate statement is equivalent to textually creating a copy of each of the statements in the statement list with the generate parameter replace by its value for that process. 6 Macro Call A macro is used in abstracting a common behavior that appears at multiple places in annotations.
1: Macro and micro time scales in VHDL. ignal X, Y, Z begin bit:= 'O'i Y <= Xi Z <= Yi endi All of the statements in a VHDL block execute in parallel. All languages that allow parallel statements of this form must somehow consistently define the value of z after execution. VHDL assumes a discrete event model of execution. The statement Y <= X projects an event on Y at some time in the future. That is, the value of Y will change to the current value of X after some delay.
An initial value for the state (in this example '0') must be given. Later, as we develop the VAL constraints on the behavior of the D flip-flop, we will see how the state is used. 4 gives the entity declaration including the state model declaration. 1. 4: D Flip-Flop Entity Declaration With State CHAPTER 2. 2 Assumptions Static constraints on generic parameters of an entity can be specified using the assume declaration. The assume declaration specifies conditions that should be observed by the user when making instantiations of the entity.
Hardware Design and Simulation in VAL/VHDL by Larry M. Augustin, David C. Luckham, Benoit A. Gennart, Youm Huh, A. Stanculescu
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