数据总线

On the other hand, maintenance and diagnostication for vehicle system should be improved to a higher level to meet the demands of people with the more electronic intelligent in automobile control system. So it is necessarily required a CAN bus monitor and general-purpose diagnostic tool used in manufacture, design and measure.

因此非常有必要研制开发基于CAN总线的总线检测设备和系统诊断装置，通过该装置完成CAN总线通信性能的检测、各控制模块中数据采集和分析、控制数据的发送、汽车系统的维护诊断功能等。

When the floppy disc drive is not writing data to or reading data from the disc, data read from the disc is supplied sector by sector from the buffer memory to the system bus or data to be written to the disc is supplied sector by sector to the buffer memory from the system bus.

当软盘驱动器不是正在将数据写入盘或从盘读取数据时，从盘读取的数据逐个扇区地从缓冲存储器传输到系统总线或待写入盘的数据逐个扇区地从系统总线传输到缓冲存储器。

This reduces the impact of a short circuit and assures that the bus does not conduct current through the aircraft. A Manchester code is used to present both clock and data on the same wire pair and to eliminate any DC component in the signal (which cannot pass the transformers). The bit rate is 1.0 megabit per second (1 bit = 1 μs).

该结构可以削弱短路对总线的影响并保证总线不会传导在航空器中流转的电流。1553总线用曼彻斯特码表示导线对上的时钟信号和数据信号，这可以去除信号中的直流成分，因为直流成分不能通过变压器。1553总线的波特率是1兆位每秒，即每微秒传输一位信号。

The paper holds the idea that, parallel bus can;t adapt to high-speed transfers due to self-limitations, and high-speed serial point-to-point bus will substitute for traditional parallel bus; data transfer will not be carried out simply by drive circuit and parallel bus, but by special high-speed serial bus; the traditional mode of single bus loading multi-device is disappearing, and a centralized switch module is replacing the bus function in a mode of one switch module connecting all devices via high-speed point to point serial bus.

文章认为并行总线由于自身缺陷，已经不适合进行高速传输，高速串行点对点连接将代替传统的并行接口；数据交换也不再是简单地通过驱动电路和并行数据线进行，而是通过特殊的串行高速总线连接；传统的在一条总线上同时挂载多个设备的模式正逐渐消亡，总线功能已被一个集中式的交换模块取代，而交换模块和各个设备都是通过高速串行点对点的方式进行连接。

Internal bus is a computer chip inside the external bus between the processor for use in chip-level interconnection; and system bus is the plug-in PC board and the bus between the system board for the interpolation pieces of board-level interconnection; external bus is between the computer and external equipment bus, microcomputer as a device through the bus and other equipment to carry out information and data exchange, and it is used equipment interoperability level even.

内部总线是微机内部各外围芯片与处理器之间的总线，用于芯片一级的互连；而系统总线是微机中各插件板与系统板之间的总线，用于插件板一级的互连；外部总线则是微机和外部设备之间的总线，微机作为一种设备，通过该总线和其他设备进行信息与数据交换，它用于设备一级的互连。

The current integrated well log instrument with multiple bus data transfer is improved by using pulse-code modulation and time division multiplex.

利用脉码调制技术和时分复用技术对现有的多总线数据传输综合录井仪进行改进，通过在井台区设置一个接口箱，使录井仪的主机柜与接口箱之间只用一根总线连接，变多总线数据传输方式为单总线数据传输方式。

Design of CSD Code FIR Digital Filter Based on Time Division Multiplex;2. The current integrated well log instrument with multiple bus data transfer is improved by using pulse-code modulation and time division multiplex .

利用脉码调制技术和时分复用技术对现有的多总线数据传输综合录井仪进行改进，通过在井台区设置一个接口箱，使录井仪的主机柜与接口箱之间只用一根总线连接，变多总线数据传输方式为单总线数据传输方式。

During the design of VXI-bus Serial Controller Module, the functions of VXI-bus including time-sequence for VXI interface, resource management, interrupt process, bus arbitration, are accomplished. To advance the performance and stability, the FPGA technic is used to implement the kerneled code including serial bus time-sequence switching to VXI interface time-sequence, the UART, the Parameterized Baud Generator and"Pipeling frame". The handle type of Data Transfer Bus for VXI-bus is researched thoroughly, and the format of serial data transfer is designed.

在VXI总线串行控制器设计中，实现了VXI总线控制器的基本功能，包括VXI总线接口时序、总线仲裁、超时处理等；同时利用先进的FPGA技术实现了串行总线时序向VXI总线时序的转换、通用异步收发器、参数化波特率发生器、流水线结构等功能模块；在设计中还深入研究了VXI总线数据传输的各种操作类型，制定了串行数据传输的编码格式。

At first, this paper introduces the receiving and transmitting mechanism about the ARINC629 data based on the ARINC629 protocol. With the computer interface technology, it gives the whole design of the communication card which is divied into three modules, such as the PCI bus interface module, the subsytem processer and memory module and the ARINC629 bus interface module.

论文首先根据ARINC629总线协议规范，明确了ARINC629总线协议的数据发送和接收机制，并结合当今计算机接口技术，确定了数据通信卡的总体方案，将数据通信卡划分为三个模块进行设计，即PCI总线接口模块，通信卡子系统处理器和存储器模块以及通信卡与ARINC629总线接口模块。

The on-board module is connected with the existing safety detection devices such as TCU, LCU and TAX box, through the serial interface bus, and realizes integrated data collection from electric apparatus and control system. The intercommunication platform between the locomotive and the ground is established based on the BEIDOU satellite and GPRS system; the former is used for distant communicating while the latter is used for massive communicating. The design of the ground supervision system is fulfilled.

制定了车载单元的串口总线协议，车载主控单元通过串口总线连接机车的微机控制柜、逻辑控制单元和TAX箱等现有独立的安全检测设备，实现对机车电器部件和控制系统运用状态信息的综合数据采集；综合采用北斗卫星通信和GPRS移动通信技术构建了机车与地面之间的双向数据通信平台，前者解决了在偏远地区的数据传输问题，后者解决了机车运用状态信息的大数据量传输问题。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。