Accurate Timing Simulation Research Articles

On the simulation of hypervisor instructions for accurate timing simulation of virtualized systems

On the simulation of hypervisor instructions for accurate timing simulation of virtualized systems

Timing-accurate simulation framework for NVM-based compute-in-memory architecture exploration

Abstract Data-intensive applications have a huge demand on processor-memory communication. To reduce the amount of data transfers and their associated latency and energy, Compute-in-Memory (CIM) architectures can be used to perform operations ranging from simple binary operations to more complex operations such as additions and matrix-vector multiplications directly within the memory. However, proper adjustments to the memory hierarchy are needed to enable the execution of CIM operations. To evaluate the trade-off between the usage of different emerging non-volatile memories for CIM and conventional computing architectures, this work extends the widely used gem5 simulation framework with an extensible timing-aware main memory CIM simulation capability. This framework is used to analyze the performance of CIM extended main memory with various emerging memory technologies, namely Spin-Transfer-Torque Magnetic Random Access Memory (STT-MRAM), Redox-based RAM (ReRAM) and Phase-Change Memory (PCM). We evaluate different workloads from the PolyBench/C benchmark suite and other selected examples. In comparison to a processor-centric system, the results show a significant reduction in execution time for the majority of applications.

Physically-Based Animation in Performing Accuracy Bouncing Simulation

This study investigates the use of physics formulas in achieving plausible bouncing simulation in animation. The need for physics animation was to produce visually believable animations adhering to the basic laws of physics. Based on the review, the creation of accurate timing simulation in bouncing dynamic was significantly difficult particularly in setting keyframes. It was comprehensible that setting the value of keyframes was unambiguous while specifying the timing for keyframes was a harder task and often time-consuming. The case study of bouncing balls’ simulation was carried out in this research and the variables of mass, velocity, acceleration, force, and gravity are taking into consideration in the motion. However, the bouncing dynamic is a significant study in animation. It is often used and it shows many different aspects of animations, such as a falling object, walking, running, hopping, and juggling. Therefore, the physical framework was proposed in this study based on numerical simulations, as the real-time animation can be addressed for controlling the motion of bouncing dynamic object in animation. Animation based physics algorithm provided the animator the ability to control the realism of animation without setting the keyframe manually, to provide an extra layer of visually convincing simulation.

Result-Oriented Modeling—A Novel Technique for Fast and Accurate TLM

Efficient communication modeling is a critical task in system-on-chip design and exploration. In particular, fast and accurate communication is needed to predict the performance of a system. Recently, transaction level modeling is used to speed up communication simulation at the cost of accuracy. This paper proposes a novel modeling technique, called result-oriented modeling (ROM), which removes the inaccuracy drawback of transaction level models (TLMs) in many cases. Using ROM, simulation models yield nearly the same speed as their traditional TLM counterparts, yet are still 100% accurate in timing. ROM utilizes the fact that internal states in the communication channel are not observable by the caller. Hence, ROM omits the internal states entirely and optimistically predicts the end result. Retroactively, the outcome of the prediction is checked, and if necessary, corrective measures are taken to maintain the accuracy of the model. We have applied the ROM concept to two examples: the industry standard AMBA AHB and the controller area network. To validate the proposed ROM approach, we have analyzed the models in detail for performance and accuracy. Our experimental results show the clear advantages of the ROM concept. For both bus systems, ROM achieves 100% accuracy and highest speeds. In essence, ROM eliminates the TLM tradeoff for a wide range of platforms. It frees the system designer from having multiple models for different purposes and extends the TLM idea to applications that require timing accurate simulation, such as real-time communication.

Simulating total-dose and dose-rate effects on digital microelectronics timing delays using VHDL

This paper describes a fast timing simulator based on Very High Speed Integrated Circuit (VHSIC) Hardware Description Language (VHDL) for simulating the timing of digital microelectronics in pre-irradiation, total dose, and dose-rate radiation environments. The goal of this research is the rapid and accurate timing simulation of radiation-hardened microelectronic circuits before, during, and after exposure to ionizing radiation. The results of this research effort were the development of VHDL compatible models capable of rapid and accurate simulation of the effect of radiation on the timing performance of microelectronic circuits. The effects of radiation for total dose at 1 Mrad(Si) and dose rates up to 2/spl times/10/sup 12/ rads(Si) per second were modeled for a variety of Separation by IMplantation of OXygen (SIMOX) circuits. In all cases tested, the VHDL simulations ran at least 600 times faster than SPICE while maintaining a timing accuracy to within 15 percent of SPICE values.