By Jun Yuan
Constraint-Based Verification covers an rising box in practical verification of digital designs, often called the "constraint-based verification. the subjects are built within the context of a variety of dynamic and static verification methods together with simulation, emulation, and formal equipment. The aim is to teach how constraints, or assertions, can be utilized in the direction of automating the iteration of testbenches, leading to a continuing verification stream. subject matters resembling verification insurance, and reference to statement established verification, also are covered.The publication objectives verification engineers in addition to researchers. It covers either methodological and technical concerns. specific pressure is given to the most recent advances in sensible verification.The learn group has witnessed fresh development of pursuits in constraint-based sensible verification. a number of thoughts were constructed. they're quite new, yet have reached a degree of adulthood in order that they are showing in advertisement instruments resembling Vera and method Verilog.
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Extra info for Constraint-Based Verification
Depending upon how randomize() is invoked, there are two situations: 46 CONSTRAINT-BASED VERIFICATION 1. If it is called by an object, then the inline constraints are added to the constraints of that object. 2. Otherwise, (randomize() is called in the current scope but not from any object) the arguments of the call, for example, a in randomize(a), are treated as random variables, and the inline constraints are the only ones applicable. 4 Random Sequence Generation SVRC’s sequence generation allows one to specify the stimulus sequences using the BNF notation, which is a common syntax for the formal speciﬁcation of programming languages.
It also took the donation of testbench/assertion languages and the DirectC programming interface from Synopsys. As for high level programmability, SystemVerilog allows ﬂexible data types such as strings and events, as well as classes that can be dynamically created and deleted. 1, taken from Goering’s EE Times March 2002 article [Goe02], lists the main constructs and data types of SystemVerilog and illustrates its relation to Verilog2001 and C. 1. initial disable events wait # @ fork/join wire reg integer real time packed arrays 2D memory begin end + = * / while % for forever >> << if else repeat SystemVerilog features.
The user can also specify at what clock the constraint should be applied using $constraint @ (posedge|negedge clock) (name, expr); Clocks can be generated with clock constraints $clock constraint (name, expr); which usually have the need to call the facility function $prev(var) to fetch the value of variable var from the last virtual clock cycle. Randomization can be done in two ways: assigning weight to input variables, or to Boolean expressions. $setprob1 (var, weight); $setprob0 (var, weight); The above statements deﬁne how likely the input variable var will take the value 1 or 0, respectively.
Constraint-Based Verification by Jun Yuan