By Allen Dewey (auth.), Alain Vachoux, Jean-Michel Bergé, Oz Levia, Jacques Rouillard (eds.)
Hardware description languages (HDL) corresponding to VHDL and Verilog have came upon their method into nearly each element of the layout of electronic structures. on account that their inception they steadily proved to be a vital a part of smooth layout methodologies and layout automation instruments, ever exceeding their unique targets of being description and simulation languages. Their use for automated synthesis, formal facts, and trying out are sturdy examples.
up to now, HDLs were normally facing electronic structures. although, built-in platforms designed this day require increasingly more analog components resembling A/D and D/A converters, part locked loops, present mirrors, and so on.
The verification of the whole process hence asks for using a unmarried language. utilizing VHDL or Verilog to deal with analog descriptions is feasible, because it is proven during this ebook, however the genuine strength is coming from actual mixed-signal HDLs that combine discrete and non-stop semantics right into a unified framework. Analog HDLs (AHDL) are thought of right here a subset of mixed-signal HDLs as they intend to supply a similar point of positive aspects as HDLs do yet with a scope restricted to analog platforms, potentially with restricted help of discrete semantics.
Analog and Mixed-Signal Description Languages covers a number of elements on the topic of analog and mixed-signal description languages together with:
using a electronic HDL for the outline and the simulation of analog platforms The emergence of extensions of latest regular HDLs that supply actual analog and mixed-signal HDLs.
using analog and mixed-signal HDLs for the advance of behavioral versions of analog (electronic) construction blocks (operational amplifier, PLL) and for the layout of microsystems that don't basically contain digital components.
using a front-end device that eases the outline activity with the aid of a graphical paradigm, but producing AHDL descriptions instantly.
Analog and Mixed-Signal Description Languages is the 1st publication to teach the best way to use those new description languages within the layout of digital elements and structures. it is crucial analyzing for researchers and architects operating in digital design.
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Additional resources for Analog and Mixed-Signal Hardware Description Language
There is no known algorithm that can reliably and efficiently detect and successfully correct for discontinuities without explicit notification of the time of occurrence. Therefore, the language includes a break statement that has both a sequential and a concurrent form. The execution of the break statement creates an event on the implicit BREAK signal; the signal itself is not visible in the model. The language semantics require the analog solver to assume a discontinuity whenever the driver of the BREAK signal is active.
J. R. -M. Berge, O. Levia, J. ). Current Issues in Electronic Modeling, vol. 2: Modeling in Analog Design. Kluwer, 1995.  "IEEE Standard VHDL Language Reference Manual", ANSI/IEEE Std 1076-1993. E. Petzold, "Numerical Solution of InitialValue Problems in Differential-Algebraic Equations, "North-Holland, 1989. E. Cellier, "Continuous System Modeling, " Springer-Verlag, 1991. W. Lewis, "Modeling Engineering Systems," HighText Publications, 1994. L. S. , Concord, MA, 1986. C. , 9(2): 213-231, March 1988.
5); port ( terminal a: Electrical; signal s: out Bit); end entity comparator; architecture simple of comparator is quantity v across a; begin s <= '1' when v'Above(level) else '0'; end architecture simple; threshold electrical input bit output across quantity to ground v > level v < level A digital process that is sensitive to such a signal executes at the exact time of the threshold crossing, which may have no exact representation in physical type Time. Such times are called offset times. Any process resuming as a consequence of a delta-delayed signal assignment in a process executing at an offset time also executes at the same offset time, and postponed processes execute, as usual, immediately before time advances.