LEC check is a signoff check and if it is failing ( No Equivalence present) one cant’ tapeout. UNIT III. The Conformal Smart Logic Equivalence Checker (LEC) is the next-generation equivalency checking solution. thank you in advance , naveen. None of the post-synthesis optimization steps are done (or least none done in a netlist-visible form) in FPGA design. The VLSI design cycle is divided into two phases: Front-end and Back-end. Conformal Smart LEC. LEC/FV in VLSI. To understand how to use Conformal LEC to formally check the equivalence between your VLSI designs in the design flow. VLSI-lec-3. VLSI CIRCUIT DESIGN PROCESSES. Download VLSI Unit 3 UNIT IV. can anyone tell me how to delete the extra cutpoint and correctly map the cut points . So please make sure all desired key points have been mapped before going to compare stage. Many EDA companies provide tools to do the check. With massively parallel architecture and adaptive proof technology, the Conformal Smart LEC delivers dramatic turnaround time improvements in equivalence checking by over 20X for RTL-to-gate comparisons. 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.. i see during LEC the tool introduced a extra cut point even though there is no loop. The changes may be very simple or complex. The most common approach is to consider the problem of machine equivalence which defines two synchronous design specifications … About VLSI-QUEST Started with a motive to help people in understanding the physical design concepts and to share the real time issues faced in PD projects. With massively parallel architecture and adaptive proof technology, the Conformal Smart LEC delivers dramatic turnaround time improvements in equivalence checking by over 20X for RTL-to-gate comparisons. LEC stands for Logical Equivalence Check and LVS stands for layout vs schematic checks. Secondly, Logic equivalence check tool only checks "mapped" key points. Download VLSI Unit 2. Front-end covers the architectural specifications, coding and verification, whereas back-end involves the physical implementation of the design on the targeted technology node. While designing a VLSI chip, there are lot of changes that the design goes through. VLSI-lec-2. golden has 2 cut points while revised has 3 cut points. A logical equivalence check can be performed between any two representations of a design: RTL vs Netlist or Netlist vs Netlist. LEC (Logical Equivalence Checks) Ensure the functional check between RTL and Netlist. The first stage RTL->gate LEC check is a prerequisite for all of this - and this LEC check is usually the HARDEST one to setup and verify. Apr 28, 2008 This Lab includes : 1. LEC can be perform between any two representations of a design: RTL vs Netlist OR Reference Netlist vs Golden netlist. lec not-mapped Please check the following key points belong to Golden(RTL) or Revised(Gate-level netlist) first, NOT-Mapped, and Extra. Equivalence checking and levels of abstraction. When LEC is failing, the first step is to check the “non-equivalent.rpt” file. GATE LEVEL DESIGN Logic equivalence check or popularly known as LEC is one of the most important parts of ASIC VLSI Design. 1. Inputs: Library files, golden Netlist, reference netlist LEC (Logic Equivalence Check) is the essential step to ensure the functional check between RTL and netlist as can also be depicted from the Fig. Conformal Smart Logic Equivalence Checker is the next-generation equivalency checking solution. that extra cut point in revised is wrongly mapped with cut point in golden. Follow by Email 2. Find the reason of non-equivalence and fix the problem from LEC supplements. Check the equivalence between two VLSI designs in different abstraction levels. VLSI Design Flow, MOS Layers, Stick Diagrams, Design Rules and Layout, 2μ CMOS Design rules for wires, Contacts and Transistors Layout Diagrams for NMOS and CMOS Inverters and Gates, Scaling of MOS circuits.

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