Application-specific customisation of micro-processor architectures has been widely accepted as an effective way to improve the efficiency of processor-based designs. In this work, the authors propose a new processor ...
详细信息
Application-specific customisation of micro-processor architectures has been widely accepted as an effective way to improve the efficiency of processor-based designs. In this work, the authors propose a new processor customisation method based on fixed-point word-length optimisation. Accuracy-aware word-length optimisation (WLO) of fixed-point circuits is an active research area with a large body of literature. For the first time, this work introduces a method to combine the WLO with the processor customisation. The data type word-lengths, the size of register-files and the architecture of the functional units are the main target objectives to be optimised. Accuracy requirements, defined as the worst-case error bound, is the key consideration that must be met by any solution. A custom processordesign environment, called PolyCuSP, is used to realise the processor architecture based on the solution found in the proposed optimisation algorithm. The results achieved by evaluating five benchmark show that this method can reduce the number of necessary LUTs and flip-flops by an average of 11.9% and 5.1%, respectively. The latency is also improved by an average of 33.4%. Moreover, the method was further examined through a case study on a JPEG decoder. The results suggest 16.2% and 56.2% reduction in area consumption and latency, respectively.
This paper proposes a new processor-based backlight dimming algorithm and hardware architecture. The processor-based design of the backlight dimming system requires low computation for real-time processing. The propos...
详细信息
This paper proposes a new processor-based backlight dimming algorithm and hardware architecture. The processor-based design of the backlight dimming system requires low computation for real-time processing. The proposed algorithm calculates an average gray level of RGB signals and combines the histogram gray-level bins to reduce computation. Additionally, it uses scene change detection and adaptive binary search to decrease iterations of the clipped error control algorithm. In the simulation results, the proposed algorithm reduced computation time by up to 94.2%, compared to a conventional algorithm. Further, the proposed processor-based backlight dimming system drove a 32-inch LCD panel successfully.
We present a novel method to online generation of time-optimal acceleration, velocity, and position trajectory values for servo-control systems using low-cost fixed-point processors with no on-chip multipliers. As in ...
详细信息
We present a novel method to online generation of time-optimal acceleration, velocity, and position trajectory values for servo-control systems using low-cost fixed-point processors with no on-chip multipliers. As in the case of many product designs, reducing system cost is a key constraint in our method. We address this constraint by optimizing required memory size, computational time, and introducing multiplication-free recursive algorithms most suitable for real-time implementation on low-cost microcontrollers. An efficient search algorithm is presented optimizing the trajectories with respect to total move time for any distance subject to physical constraints of the system. We also introduce a normalized set of first-order difference equations using only integer arithmetic and additions to compute the trajectory values. Complexity of the proposed method is compared with multiplication-based and lookup table methods using three popular microcontrollers with and without an on-chip hardware multiplier.
暂无评论