Circuits

A Practical Guide for SystemVerilog Assertions by Srikanth Vijayaraghavan

By Srikanth Vijayaraghavan

SystemVerilog language involves 3 very particular parts of constructs - layout, assertions and testbench. Assertions upload an entire new size to the ASIC verification procedure. Assertions supply a greater method to do verification proactively. commonly, engineers are used to writing verilog try benches that support simulate their layout. Verilog is a procedural language and is particularly constrained in services to deal with the advanced Asic's outfitted this day. SystemVerilog assertions (SVA) are a declarative and temporal language that gives first-class regulate through the years and parallelism. this gives the designers a really robust device to unravel their verification difficulties. whereas the language is outfitted stable, the considering is particularly various from the user's viewpoint compared to plain verilog language. the idea that remains to be very new and there's no longer adequate services within the box to undertake this system and prevail. whereas the language has been outlined rather well, there's no sensible advisor that indicates easy methods to use the language to resolve genuine verification difficulties. This publication could be the sensible advisor that would aid humans to appreciate this new method.

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Extra info for A Practical Guide for SystemVerilog Assertions

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At clock cycle 11, both signal "a" and signal "b" are detected high. In clock cycle 12, signal "c" is high and hence the antecedent of the implication succeeds. This means that, 2 clock cyclesfi^omnow, which is clock cycle 14, signal "d" should be low. But in the sample waveform signal "d" is a high and hence the property fails. All the vacuous successes are shown with a simple straight line. The markers 3s and 3e show the start and end of a successful property evaluation. The expression "a && b" is evaluated to be true in clock cycle 17 and one clock cycle later, the signal "c" is high, as expected.

Sequence sl8a_ext checks for the same condition, but moves the match on this sequence by one clock cycle. This has an impact on when this sequence is used in the antecedent of a property. The end points of the 2 sequences are different and hence the clock cycle at which the consequent will be checked will vary. ended. ended in the antecedent. ended, but moved 1 clock cycle ahead. Hence, the consequent of property pl8_ext needs to match after one clock cycle and not 2 clock cycles as defined in property pi8.

It cannot be used in sequences. There are 2 types of implication: Overlapped implication and Nonoverlapped implication. 1 Overlapped implication Overlapped implication is denoted by the symbol |->. If there is a match on the antecedent, then the consequent expression is evaluated in the same clock cycle. A simple example is shown below in property p8. This property checks that, if signal "a" is high on a given positive clock edge, then signal "b" should also be high on the same clock edge. property p8; ©(posedge elk) endproperty a |-> b; a8 : assert property(p8); Figure 1-11 shows how the assertion a8 responds in a simulation.

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