In addition to the current offerings for digital device support:
- Classic SIMPLIS Digital Devices
- Advanced SIMPLIS Digital Devices
- SystemDesigner Symbol and Model Library
- Co-simulation with Verilog-HDL (SIMPLIS VH)
version 8.40 of SIMPLIS has added support for user-defined digital devices implemented in C/C++ and distributed as a DLL.
Technical and Usage Highlights
- Bus-oriented I/O with built-in support for reading/writing Unsigned, Two’s Complement and Binary Offset encodings
- Supports parameterization, Monte Carlo and Multi-Step using Multi-Core
- Automatic symbol and editing dialog creation
- Supports multiple device and version definitions within the same DLL
Requirements for DLL-defined Digital Devices
- A C/C++ Compiler Toolchain (e.g. Visual Studio)
- The SIMPLIS Digital Development Kit
- containing header files, documentation and examples
- SIMetrix/SIMPLIS Pro or Elite v8.40 or later
- the functionality will be made available automatically to Pro and Elite users for no additional cost
Usage Highlights: Bus-Oriented I/O
Modeling with SIMPLIS Advanced Digital devices uses SIMPLIS primitive digital components which are pin-oriented, requiring the user to wire each pin of a bus to a bus connector or another pin. To read a set of pins as an integer value, a bus ripper must be used to construct a number from individual bits.
DLL-defined digital devices are bus-oriented, allowing users to utilize bus wiring for connectivity. During a simulation, bus values can be read from and written to as integers instead of individual bits.
Cautions and Caveats
DLL-defined Digital Devices run inside the SIMPLIS Advanced Digital simulation engine and so share the same advantages and limitations. A few things to note:
- Like all other devices running in the Advanced Digital simulator, a non-zero output delay is enforced. This eliminates problems associated with the classic SIMPLIS logic gate's ability to instantaneously switch state with zero delay.
- While ultimately dependent on the specific circuit and operating conditions, for digitally controlled systems where the signals in the feedback loop are quantized into discrete levels, the POP / AC analysis is typically not applicable. The extremely small perturbation of the injected signal during the AC analysis is not large enough to produce a control loop response. These circuits are usually better suited to the SIMPLIS Multi-Tone AC Analysis.