By Ken Kundert, Olaf Zinke
The Designer's consultant to Verilog-AMS offers Verilog-AMS, the recent analog and mixed-signal extensions to the generally used Verilog description language. It starts off by way of describing a rigorous and confirmed top-down layout technique. Top-down layout is extensively obvious because the key to with the ability to layout very huge and complicated mixed-signal circuits and it really is enabled by way of Verilog-AMS. Verilog-A and Verilog-AMS are then brought with out assuming that the reader has a heritage in behavioral modeling. ultimately, it incorporates a finished reference advisor for the language. The Designer's consultant to Verilog-AMS is generally cross-referenced and listed, making it an excellent reference for either Verilog-A and Verilog-AMS. A spouse site, www.designers-guide.com, presents digital copies of all of the versions utilized in this publication, a library of user-contributed types, a dialogue discussion board, extra records on simulation and modeling, and different worthy fabric. The Designer's advisor to Verilog-AMS is written for analog and mixed-signal designers, quite these designing higher and extra advanced circuits.
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Sample text
This creates several barriers to the success of the IP. First, with the model not being used as an integral part of the design process it does not get much in the way of incidental testing. Substantial extra effort is required to field a high quality model, resulting in extra cost and delay. Furthermore, it is unlikely that the same quality model would be developed with an adjunct process. Second, with the model not being leveraged during the design process, the total cost of developing the model offsets any revenue from the IP, requiring higher levels of market success to break even.
2 Improves Productivity The improved productivity that results with a rigorous top-down design process is due mainly to the elimination of mistakes and re-spins. A more formal, less error-prone design process with better communication between engineers means that less time is 30 5 Further Benefits of Top-Down Design spent making and recovering from mistakes, and more time is spent on productive design tasks. 3 Improves Ability to Handle Complex Designs The ability of a design team following a rigorous top-down design methodology to handle more complex designs follows from the better system exploration and from the increased understanding of the design that comes from it, and from the improved communications.
Some propose to use either timing simulators (sometimes referred to as fast or reduced accuracy circuit simulators) or circuit simulators running on parallel processors. However, both approaches defer system-level 27 Chapter 2 Top-Down Design verification until the whole system is available at transistor level, and neither provides the performance nor the generality needed to thoroughly verify most mixed-signal systems. They do, however, have roles to play both within the mixed-level simulation process and during final verification.