By Srikanth Vijayaraghavan
SystemVerilog language involves 3 very particular parts of constructs - layout, assertions and testbench. Assertions upload a complete new measurement to the ASIC verification technique. Assertions supply a greater method to do verification proactively. often, engineers are used to writing verilog try out benches that support simulate their layout. Verilog is a procedural language and is particularly restricted in services to address the advanced Asic's outfitted at the present time. SystemVerilog assertions (SVA) are a declarative and temporal language that gives very good keep watch over over the years and parallelism. this gives the designers a truly powerful device to unravel their verification difficulties. whereas the language is outfitted sturdy, the pondering is especially assorted from the user's viewpoint compared to plain verilog language. the concept that continues to be very new and there's now not sufficient services within the box to undertake this system and be triumphant. whereas the language has been outlined rather well, there's no sensible advisor that exhibits tips to use the language to resolve actual verification difficulties. This publication stands out as the useful advisor that might aid humans to appreciate this new technique.
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Extra info for A Practical Guide for SystemVerilog Assertions
If signal "a" is high, then the sequence starts. The sequence succeeds after 2 clock cycles if signal "b" is high (clock 5 and clock 14). On the other hand, if signal "b" is not high after 2 clock cycles, then the sequence fails. Note that the success of a sequence is always represented in the figure at the starting point of the sequence. Table 1-3. Evaluation table for sequence s4 Clock tick Sampled value of "b" 0 0 Valid start of s4 1 2 Sampled value of "a" 0 1 3 4 5 0 0 1 1 0 0 No No Yes 6 7 8 9 0 0 0 1 0 1 0 0 No No No Yes 10 11 12 13 14 0 0 0 0 1 0 0 1 0 0 No No No No Yes 15 16 17 0 0 0 0 1 0 No No No No Yes S4 status Fail Fail (start at 2, end at 4) Fail Fail Success (start at 5, end at 7) Fail Fail Fail Fail (start at 9, end at 11) Fail Fail Fail Fail Success (start at 14, end at 16) Fail Fail Fail 1.
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.
Figure 1-2 shows a simplified SystemVerilog event schedule flow chart. 1a LRM . 1. Introduction to SVA Preponed 11 Active Pre-active From •' Inactive Pre-: sfB A NBA Post-]'JBA Observed Post-C bservec 1 Reactive Postponed To next t ime slot Figure 1-2. 4 SVA Terminology There are two types of assertions defined in the SystemVerilog language: Concurrent assertions and Immediate assertions. 1 • • • • • Concurrent assertions Based on clock cycles. Test expression is evaluated at clock edges based on the sampled values of the variables involved.