Download Constraint-Based Verification by Jun Yuan PDF

Show description

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.