Verification之PSL之intro

1　　PSL - Property specification language

　1.1　Property

　　　　- Characteristics of the designs/verification environment 

　　　　– Behavior represented by a sequence of temporal (over time) relationships of Boolean expressions.

　1.2   Verification

　　　　- confirming that, for a given design and a given set of constraints, a property that is required to hold in design actually does hold those constraints

　　　　

 1.3   ABV with PSL

　　　- ABV is a documentation and verification methodology (Instruments system requiremets, interfaces, design and verification enviroments with assertions)

　　　- PSL is a property specification language

2　　External assertion files

　　Syntax and example

-- VHDL flavor, Separate file linked at compile time
vunit abc_if_vu (entity_name(architecture_name)) 
{
    default clock is (clk'event and clk = '1');
    property A1 is never (a and b); 
    assert A1 ;
}

3　　More on PSL

　　　-- Documents requirements

　　　　* system, interface, design

　　　-- Defines combinational temporal properties

　　　　* embedded into design HDL spurce, or

　　　　* seperately in vunit files

　　　　* carried at all phases of sublocks process 

　　　-- Enable verification of assertions

　　　　* dynamically during simulation

　　　　* statically through formal verification