Abstract
AMS hardware description languages like VHDL-AMS provide features for modeling at discrete and continuous domains of abstraction and communicating between them. A mixed net arises in mixed-signal design as the result of interconnecting components modeled in different domains, in particular when connecting a discrete and a continuous port. Hardware description languages do not support such connections directly. They require the insertion of an appropriate conversion model between the dissimilar ports. Using conversion models correctly, a mixed net can be successfully partitioned and modeled with the desired blend of accuracy and performance.
This paper explains mixed nets and their various configurations, setting the requirements for needed conversion models. Conversion models are explained, including criteria for what makes a good one. Strategies for partitioning a mixed net and inserting conversion models are discussed. A proposal is made for extending VHDL-AMS to handle mixed nets and automatic insertion at elaboration.
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References
P. Ashenden, G. Peterson, D. Teegarden: The System Designer’s Guide to VHDL-AMS. Morgan-Kaufman Publishers; 2003.
E. Christen, K. Bakalar, A.M. Dewey, E. Moser: Analog and Mixed-Signal Modeling Using the VHDL-AMS Language; Tutorial at 36th Design Automation Conference, 1999
IEEE Std. 1076.1-1999 IEEE Standard VHDL Analog and Mixed-Signal Extensions
Verilog-AMS language Reference Manual, Version 2.0. Open Verilog International; February, 2000.
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© 2005 Springer
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Shields, J., Christen, E. (2005). Mixed Nets, Conversion Models, and VHDL-AMS. In: Boulet, P. (eds) Advances in Design and Specification Languages for SoCs. Springer, Boston, MA. https://doi.org/10.1007/0-387-26151-6_3
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DOI: https://doi.org/10.1007/0-387-26151-6_3
Publisher Name: Springer, Boston, MA
Print ISBN: 978-0-387-26149-2
Online ISBN: 978-0-387-26151-5
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