Conformal and Formality are both formal equivalence tools – they check that two circuit descriptions are functionally the same. They both have. 2, Synopsys Inc. introduced Formality, the industry’s first formal verification tool for equivalency checking of million-gate, system-on-a-chip (SOC) designs. This document contains a brief introduction to Synopsys Design Analyzer, Sysnopsys Formality, and. Cadence Conformal tools. You would.
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The previous design takes 15hours, this design is going past 20 hours. Equivalence is not to be confused with functional correctness, which must be determined by functional verification. Maybe some additional constraints might be required.
Thu Sep 17 This page was last edited on 4 Septemberat Also, gate-level simulations are notoriously slow to execute, which is a major synopshs as the size of digital designs continues to grow exponentially.
Therefore, instead of blindly assuming that no mistakes were made, a verification step is needed to check the logical equivalence of the final version of the netlist to the original description of the design synopys reference model. Retrieved from ” https: Netlist against RTL, based on formal methods, no assertion here.
Formal equivalence checking
Logic synthesis Place and route Placement Routing Register-transfer level Hardware description language High-level synthesis Formal equivalence checking Synchronous logic Asynchronous logic Finite-state machine Hierarchical state machine.
In general, there is a wide range of possible definitions of functional equivalence covering comparisons between different levels of abstraction and varying granularity of timing details. Formal equivalence checking process is a part of electronic design automation EDAcommonly used during the development of digital integrated circuitsto formally prove that two representations of a circuit design exhibit exactly the same behavior.
All the programs later in the process that make changes to the netlist also, in theory, ensure that these changes are logically equivalent to a previous version. Your concern is valid, but still it is not considered as a functional violation.
Hi, with formality you make an equvalence check: LEC is strict and wont support unsynthesizable constructs. How to run LEC after bottom-up syn. This description is the golden reference model that describes in detail which operations forkality be executed during which clock cycle and by which pieces of hardware.
A formal equivalence check can be performed between any two representations of a design: This process is called gate synopssys logic simulation. Hi all, i’m currently working on synopsys formality.
Synopsys formality –
I have the workshop labs for Design Compiler and PrimeTime, and I was wondering if there is such a workshop for formality. On compilation of a specific module, I run into this issue. The big problem of formal verivication. The previous design is 2. How can I formality check what inserted scan and clock gating? These DV tools don’t care about drive strength. But in hierarchical mode there are many failing modules.
Formaliyt an enable signal. Which tool can verify functional equivalence if given two different netlist files? But when I insterted scan and clock gating, then they are not equality.
Hi Guys, I meet an issue when I read.
This may cause simulation -synthesis. But it should be possible to get it passing with Conformal as well.
How do I fix read asynchronously in formality? If you asked Synthesis to re-balance logic, the input logic for some registers will be different.
Views Read Edit View history. In other words, there’s a possibility that the tools is. My question is that if I were provided with two designs. Which tool can verify functional equivalence if given two different netlist files? The big problem of formal verivication.
This is the first time through formality with this design and I’m seeing a very long run time. I’m hoping that FM will see that the points have already been matched and not go off and spend time ofrmality them.
Afterwards the verification goes on successfully.
The main question in my mind is, why I need to verify the netlist. Also, in real life, it is common for designers to make manual changes to a formallity, commonly known as Engineering Change Ordersor ECOs, thereby introducing a major additional error factor.
RTL design flow synthesis, verilog.