铁电存储器原理及应用比较

介绍铁电存储器(FRAM)的一般要领和基本原理,详细分析其读写操作过程及时序。将FRAM与其它存储器进行比较,分析在不同场合中各自的优缺点。最后以FM1808为例说明并行FRAM与8051系列单片机的实际接口,着重分析与使用一般SRAM的不同之处。     

DSP与FM25CL64接口驱动软件的实现

本文给出了一种在TMS320F2812下,利用铁电存储器FM25CL64实现数据存取接口的软件设计方法。主要介绍了DSP芯片TMS320F2812SPI模块和FM25CL64芯片的功能特点,以及SPI模块、存储器、应用接口等各部分软件的设计。经充分测试和初步应用,驱动软件设计合理,接口灵活,能够满足系统要求。     

FM25L256与C8051F020单片机的SPI接口设计

介绍一种具有SPI接口的铁电存储器FM25L256,以及其与C8051F020单片机的接口电路,并给出了操作的软件流程。这种方式具有非易失性、高速读写、超低功耗、几乎无限次擦写,并且占用极少单片机引脚数的优点。以后必将成为MCU外扩数据存储器的主要方式。     

铁电存储器FM30C256在工业记录仪器中的应用

铁电存储器是新一代的非易失性存储器,FM30C256是RAMTRON公司新近推出的铁电存储器芯片,该器件在同一芯片内集成了32Kbyte存储器和实时时间等电路。特别适合作为工业记录记录仪器的数据采集记录。本文在简要介绍FM30C256芯片的基础上,给出了用AVR单片机ATMEGA8和该存储器构成的记录器的例子。     

铁电存储器FRAM及其与MCU的接口技术

铁电存储器FRAM是具有低功耗、高写入速度、高耐久力的新型非易失性存储器,应用范围广泛。本文介绍FRAM及其应用,并给出FRAM与MCS-51单片机的接口电路和软件设计。     

铁电存储器与SD卡的数据传输方法

介绍利用ATmega64L单片机实现铁电存储器FM24C256中的数据向SD卡传输与存储的方法。首先利用上位机操作系统完成SD卡文件系统的构建,并将预先建立的.txt文件顺序复制到SD卡中;然后利用ATmega64L单片机同时具备TWI和SPI接口的优势,通过铁电存储器和SD卡的底层读写函数,将存储在铁电存储器中的数据传输到SD卡并保存在相应的.txt文件中。     

基于ARM的同步发电机故障录波系统的设计

介绍了一种发电机故障状态数据录波系统设计方法。利用了高速ARM芯片及高精度三相计量芯片ADE7758组成交流采样电路,从而能实现高速数据采集和转换,将故障前后的数据保存在铁电存储器中。在VB环境下实现计算机与ARM的串行通信,读取铁电存储器FM24C256中保存的故障数据并用图形显示出来。实践证明该系统图形界面友好、可靠性高、操作方便、应用效果好。     

一种基于FM20L08的温度测试仪

采用了一种新型的铁电存储器FM20L08,介绍了它的性能、特点、与现有其他存储器的不同之处,并在此基础上开发了FM20L08温度测试仪,有针对性地给出了硬件和软件的设计细节和流程图。     

用于计算机系统的铁电随机存储器的研究进展

综述了铁电存储器的存储原理、电路结构及应用、尚未解决的主要铁电材料的环保问题、疲劳失效问题、信息保持力和破坏性读出等问题.     

Ramtron出货首批使用新IBM生产线制造的F—RAM样片

低功耗铁电存储器（F—RAM）和集成半导体产品开发商及供应商Ramtron International Corporation（简称Ramtron）宣布，已经可广泛提供在新IBM公司生产线上制造的首批预验证铁电存储器（F—RAM）样片。FM24C04C和FM24C16C是位密度分别为4Kb和16Kb的串行5VF—RAM...     

FRAM在DSP开发系统中的应用

本文首先介绍了FRAM的特点;然后在分析了FRAM配置及DSP的SPI通信模块的基础上,给出了FM25L256与TMS320F2812DSP的接口电路的硬件设计。最后,文章给出了SPI模块初始化程序及DSP与FRAM之间接口程序设计。     

几种新型非易失存储器的原理及发展趋势

介绍几种有发展潜力的新型非易失存储器的原理,如铁电存储器、磁性随机存储器、相变存储器和阻变存储器等,并在性能方面作了对比,最后对存在的问题和发展趋势进行了分析。     

Modeling complex socio‐technical systems using the FRAM: A literature review

This is a review paper of studies that have employed the functional resonance analysis method (FRAM). FRAM is a relatively new systemic method for modeling and analyzing complex socio‐technical systems. This review aims to address the following research questions: (a) Why is FRAM used? (b) To what domains has FRAM been applied? (c) What are the appropriate data collection approaches in practice? (d) What are the deficiencies of FRAM? A review of 52 FRAM‐related studies published between 2010 and 2020 revealed that FRAM‐based models can be used as a basis for improving safety management, accident/incident investigation, hazard identification/risk management, and complexity management in complex socio‐technical systems. The outcomes also showed that healthcare was the most common domain that employed FRAM (31% of the investigated studies). The results of exploring data collection methods indicated a mixed method (interview, focus group, observation) was employed in 52% of the analyzed studies, and the accident investigation report was the most popular approach in aviation‐related studies. An investigation of the deficiencies of the FRAM showed that it should be upgraded by exploiting supplementary methods to enhance its analytical and computational capacity to help risk analysts and safety managers in complex socio‐technical systems.     

在线式巡逻和报警监视管理系统

技防与人防以及主动与被动防范技术结合是安防技术发展的主要方向。本文介绍了一种集在线式巡逻管理、门禁和报警功能于一体的安全防范系统。该系统采用了DALLAS的一线总线技术,以PHILIPS公司的87LPC764为控制核心,铁电体存储器FM25040作为存储单元,具有响应时间快,性能稳定可靠等特点。     

嵌入式Linux下的FRAM驱动程序设计

针对铁电存储器(FRAM)在基于ARM9的嵌入式Linux系统下设备节点的读写及应用问题,研究Linux系统的驱动设计,分析FRAM的工作原理和硬件特性,提出基于Linux系统标准驱动架构与铁电底层预处理、读写、控制等工作机制相结合的FRAM驱动程序设计与实现流程。底层实现采用内核级基于FRAM的寻址方式,结果证明了该驱动在相应数据存储、传输中的可行性与稳定性。     

Chameleon: A High Performance Flash/FRAM Hybrid Solid State Disk Architecture

Flash memory solid state disk (SSD) is gaining popularity and replacing hard disk drive (HDD) in mobile computing systems such as ultra mobile PCs (UMPCs) and notebook PCs because of lower power consumption, faster random access, and higher shock resistance. One of the key challenges in designing a high-performance flash memory SSD is an efficient handling of small random writes to non-volatile data whose performance suffers from the inherent limitation of flash memory that prohibits in-place update. In this paper, we propose a high performance Flash/FRAM hybrid SSD architecture called Chameleon. In Chameleon, metadata used by the flash translation layer (FTL), a software layer in the flash memory SSD, is maintained in a small FRAM since this metadata is a target of intensive small random writes, whereas the bulk data is kept in the flash memory. Performance evaluation based on an FPGA implementation of the Chameleon architecture shows that the use of FRAM in Chameleon improves the performance by 21.3%. The results also show that even for bulk data that cannot be maintained in FRAM because of the size limitation, the use of fine-grained write buffering is critically important because of the inability of flash memory to perform in-place update.     

Modelling complexity in everyday operations: functional resonance in maritime mooring at quay

Maritime operations are complex socio-technical activities, with many interacting agents. Such agents are acting based on different, sometimes conflicting, goals. The traditional approach for safety, based on decomposition and bimodality, might lead to ineffective analyses, ignoring the transient and hidden links among activities as they are performed in everyday work. In this sense, the Functional Resonance Analysis Method (FRAM) offers a representation of work-as-done, acknowledging variability as unavoidable and desirable in order to avoid failures and maintain production. This paper adopts FRAM in combination with an Abstraction/Agency framework to understand and contribute with new perspectives to the complexity of processes. This approach, in line with the principles of Resilience Engineering, is adopted in the traditionally underspecified operation of mooring at quay. The detailed model confirms the benefits of FRAM in representing complex highly coupled tasks, especially in combination with an analysis at different levels of abstractions. The outcomes of the study show how a FRAM model offers systemic and punctual insights for understanding emergent criticalities, analysing complex incident scenarios, identifying potential mitigating actions, exploring different varieties of work and gaining systemic knowledge.     

Refining operation guidelines with model-checking-aided FRAM to improve manufacturing processes: a case study for aeroengine blade forging

With the aid of the Finite State Machine (FSM) and formal verification, a framework of updated Functional Resonance Analysis Method (FRAM) is proposed to refine operation guidelines as such and hence improves manufacturing processes by reducing risks of unqualified products during manufacturing operations. Firstly, the FRAM is used to model a manufacturing process in terms of the corresponding guideline, taking into account all the basic activities each with their performance variability and the potential couplings among the activities. Secondly, based on the FRAM model further interpreted with FSM, the model checker SPIN is adopted to achieve the exhaustive search (in the sense of execution) for the paths leading to manufacturing risks, which supports to illustrate how the performance variability in the activities couples and finally causes violation of quality control requirements. Finally, possible inadequacies and deficiencies of the operations are identified and measures for refining the guideline are developed to minimize the risks due to the inherent issues of specification in the guideline. In a case study, the proposed framework is applied to a typical manufacturing process prone to risks, i.e., forging of aeroengine titanium alloy blades, and the analysis results indicate practicality of the framework, as well as effectiveness of the guideline refinements.