Library Characterization Assignment Help
Cell library characterization is a procedure of examining a circuit utilizing vibrant and fixed approaches to produce designs appropriate for chip execution streams. Why is cell library characterization required? No digital chip is possible without cell designs. These cell designs are produced by cell library characterization utilizing business software applications like guna. Every digital chip application (rtl-to-gdsII) circulation needs cell designs for analysis (reasoning simulation, confirmation, timing, power, sound etc), application (synthesis, test insertion, positioning, clock tree synthesis, routing) and repairing (engineering modification order, guideline repairing etc). Siliconsmart ACE is a software application tool that creates a library in Liberty (. lib) format from a set of SPICE designs, cell practical descriptions, and associated netlists. The created library can then be utilized for power, timing, and sound analysis with suitable tools such as Library Compiler, IC Compiler, Design Compiler, and PrimeTime. Cell library characterization normally takes cell style drawn out as spice circuit and spice innovation designs. Characterization software application like guna, examines this info to
- acquire or acknowledge cell’s function,
- produces stimulus proper to figure out particular (like hold-up, shift time etc),.
- replicates it utilizing circuit simulator,.
- collect simulations output to determine particular and.
- Composes this information into a requirement like libertytm, ibis or veriog.
The characterization engine carries out comprehensive cell circuit analysis that instantly identifies the needed set of stimuli and produces Spice decks to carry out all characterization measurements for both consecutive and combinational digital reasoning cells. Creating at nanometer procedure innovations– and particularly at sophisticated nodes (28nm and listed below)– needs lots of extra library views in order to attain premium silicon and prevent silicon re-spins due to unreliable signoff analysis. For precise modeling of instance-specific voltage variation or temperature level gradients, it’s important to identify each library at numerous temperature levels and several voltages, increasing the overall variety of library corners. For the most innovative procedures, it is ending up being typical to provide alternative cell libraries that enhance yield at the cost of location and efficiency. As an outcome, developing and keeping all these library views is ending up being a significant traffic jam in the style circulation.
Cadence offers a library characterization circulation fixated the Cadence ® Virtuoso ® Characterization Suite. Embraced by significant clients all over the world, the suite consists of the Virtuoso Liberate ™ Characterization Solution, the Virtuoso Liberate LV Library Validation Solution, the Virtuoso Variety ™ Statistical Characterization Solution, the Virtuoso Liberate MX Memory Characterization Solution, and the Virtuoso Liberate AMS Mixed-Signal Characterization Solution. The suite provides the market’s most robust and total services for the characterization, variation modeling, and recognition of your structure IP, from basic cells, I/Os, and complicated multi-bit cells to memories and mixed-signal blocks. Cadence’s trademarked InsideView innovation provides much better connection to silicon by enhancing library throughput and making sure timing, power, sound, and analytical protection of your IP.
The Virtuoso Characterization Suite likewise incorporates with the Cadence Spectre ® Circuit Simulator, the industry-standard SPICE simulator, providing even higher throughput with the precision needed for advanced-node libraries. Electronic simulation and characterization of input/output and core’s libraries are performed with use of specialized software application tools and designs of primitive components defined for the needed procedure innovation. Characterization is performed in all required PVT (Process/Voltage/Temperature) conditions. The outcomes of characterization exist in the Liberty format and consist of tables of the following criteria:.
- – timing specifications.
- – Setup/Hold criteria.
- – minimum pulse width.
- – power usage.
We supply devoted groups for the advancement of libraries based on the client’s requirements. We establish libraries in innovations varying from 0.35 um to 20nm. The cell is embedded in a test circuit where it is owned by “genuine” live motorists and filled with the optimum loads at its outputs. Instantly produced SPICE stimuli are used and the outputs of the circuit are compared versus the anticipated worths. Particularly for brand-new cell libraries, SpiceTest has actually been really reliable in recognizing malfunctioning cells. ACDL description of the cell is the requirements upon which inputs and anticipated worths of the outputs are based. Even for intricate cells, test vectors can be produced in seconds.
SpiceTest creates a SPICE netlist which consists of the design cards, ecological criteria, test vectors created from ACDL, a circumstances of the Cell-Under-Test, its loads and chauffeurs. SPICE is called to do circuit level simulation. A SpiceTest user does not actually have to understand ways to utilize SPICE and do circuit simulation. The cell style and confirmation procedure can be sped up by handing over the confirmation part to SpiceTest. Many characterization services supply a repaired set of specifications to be associated with each cell. It is compared with the habits of the circuit utilizing circuit simulation.