Quantum-SI™ Overview
Quantum-SI is the recognized leader for high-speed design among electrical and signal integrity engineers, with a proven track record for addressing tough high speed design problems. Quantum-SI's comprehensive analysis capabilities accurately predict system-level noise and timing margins while significantly reducing the time and effort required to perform analysis with traditional methods. Quantum-SI's "interface-centric" analysis approach allows engineers to quickly and easily analyze an entire design for the composite effects of signal integrity, crosstalk and timing and achieve first pass success. Quantum-SI's advanced data and simulation management allows designers to easily simulate and manage thousands of simulations.
Integrated Signal Integrity and Timing Analysis
Quantum-SI provides a truly integrated solution for signal integrity and timing analysis of complex high-speed multi-board systems.
  • Quantum-SI implements a methodology that encompasses pre-layout and post-layout simulations with rigorous waveform processing, automatically extracting waveform quality reports and interconnect delays.
  • Extracted interconnect delays are utilized by static timing analysis for both synchronous and source-synchronous designs.
  • Quantum-SI provides the flexibility to perform all signal integrity and timing analysis at either the core of the chip, the pad of the I/O, or the pin of the package of both the source and target components.  
Quantum-SI Integrated Signal Integrity and Timing Analysis
Timing Analysis, Waveform Quality, and Eye Diagram Processing

Interface-centric Analysis
Quantum-SI captures the different signal classes in a high speed interface and their required timing relationships. Quantum-SI uses this information to drive how timing and signal integrity analyses are performed. Traditional tools perform signal integrity analysis only, leaving timing analysis and the integration of signal integrity and timing data up to the user. Quantum-SI uses net-class specific information to drive signal integrity analysis, using appropriate data rates and stimulus patterns. Interconnect delays are extracted from signal integrity simulations and are combined with the timing model to determine timing margins for all the required timing relationships in the interface.
Quantum-SI Interface-centric Analysis

Core-to-Core™ Methodology
SiSoft has developed a formalized end-to-end analysis methodology, known as Core-to-Core™, which includes a highly automated process for analyzing signal integrity, crosstalk and timing from the inputs of output buffers to the outputs of input buffers and all the electrical interconnects in between. This methodology is implemented in the Quantum-SI pre-/post-layout analysis flows. Quantum-SI is the only product that completely integrates these complex analyses in a single solution allowing engineers to achieve High-Speed Design Closure.
Quantum-SI Core-to-Core™ Methodology

Rigorous Waveform Processing
Quantum-SI offers the industry's most rigorous waveform and eye diagram analysis, processing every edge of every waveform, across the entire solution space. With over 18 measurement levels, and the ability to uniquely specify both rising and falling parameters, only Quantum-SI allows engineers to process the most advanced I/O structures and accurately assess the true waveform quality and timing margins in a design.
Quantum-SI Waveform Processing Levels
Waveform Processing Levels

Quantum-SI's Spice/IBIS Simulator
Quantum-SI has integrated the Intusoft IsSpice4 simulator as its internal Spice/IBIS simulation engine providing high-performance, extremely accurate simulation for IBIS I/O buffers and lossy transmission lines including support for standard Spice elements.

HSPICE® Integration
All Quantum-SI product configurations provide a seamless interface to the HSPICE simulation engine, which includes support for native HSPICE and HSPICE/IBIS simulation including encrypted HSPICE models.

Simulation Farm Support
SimFarm enables users to run multiple simulations in parallel to maximize compute resource utilization and throughput. Simulation throughput scales directly with the number of simulation engines available. Quantum-SI can submit simulations to local or remote simulation farms including queuing systems, such as IBM Platform LSF and Microsoft HPC.

Design Analysis Reuse
Design analysis reuse is defined as the ability to reuse design analysis environments within an implementation, across different physical implementations, and between pre-layout and post-layout analysis. Quantum-SI provides analysis reuse by utilizing the transfer net data structure (similar to a net class). This unique capability allows SiSoft to offer pre-configured Quantum-SI design analysis kits that are ready to simulate out-of-the-box for signal integrity, crosstalk, and timing. These kits have been proven to shave weeks to months off of the traditional analysis cycle.

Transfer Netlist
The transfer net is an implementation independent network description and serves as the primary data structure for Quantum-SI. It is similar in concept to a net class, but includes key information about component connectivity, component transfers, operating frequency, and measurement points. The transfer net construct is the key to tight integration between pre-layout and post-layout and is instrumental for design analysis reuse.