Test pattern generation apparatus and method for SDRAM
    72.
    发明授权
    Test pattern generation apparatus and method for SDRAM 失效
    用于SDRAM的测试图形生成装置和方法

    公开(公告)号:US6094738A

    公开(公告)日:2000-07-25

    申请号:US121954

    申请日:1998-07-24

    IPC分类号: G01R31/28

    CPC分类号: G01R31/28

    摘要: A test pattern generation apparatus and method for an SDRAM can easily generate a test pattern for a synchronous dynamic RAM (SDRAM) by having a specific wrap conversion circuit or an address conversion method. The wrap conversion circuit is provided to receive two types of address data from a pattern generator and converts the data through a specified logic circuit information. The test pattern generation method for the SDRAM is carried out by inputting column address data and wrap address data, and by generating output data which has been converted by a predetermined logic equation. The test pattern generation apparatus and method can also include an address inversion scramble for the converted output.

    摘要翻译: 用于SDRAM的测试图形生成装置和方法可以通过具有特定的卷绕转换电路或地址转换方法来容易地生成用于同步动态RAM(SDRAM)的测试模式。 提供包裹转换电路以从模式发生器接收两种类型的地址数据,并通过指定的逻辑电路信息转换数据。 通过输入列地址数据和包裹地址数据,并且通过产生已经通过预定逻辑等式转换的输出数据来执行用于SDRAM的测试图案生成方法。 测试模式生成装置和方法还可以包括用于转换的输出的地址反向加扰。

    Automatic reflow apparatus with pressure equalization means
    76.
    发明授权
    Automatic reflow apparatus with pressure equalization means 失效
    具有压力均衡装置的自动回流装置

    公开(公告)号:US5296680A

    公开(公告)日:1994-03-22

    申请号:US21558

    申请日:1993-02-24

    申请人: Osamu Yamada

    发明人: Osamu Yamada

    摘要: An automatic soldering apparatus for soldering a printed circuit board includes a plurality of electronic elements mounted thereon to be soldered thereto. The apparatus is structured to have a first station provided with a first outer opening for enabling the printed circuit board to be transported therethrough into a heating chamber so as to be soldered therein and further provided with a first inner opening, a second station provided with a second outer opening for enabling the soldered printed circuit board to be transported therethrough out of the heating chamber, and further provided with a second inner opening, and a duct having one end opening and an opposite end opening, the one end opening being connected to the first inner opening of the first station and the opposite end opening being connected to the second inner opening of the second station, the areas of the first inner opening the one end opening being larger than the area of the first outer opening, and the areas of the second inner opening and the opposite end opening being larger than the area of the second outer opening.

    摘要翻译: 用于焊接印刷电路板的自动焊接装置包括安装在其上待焊接的多个电子元件。 该设备被构造成具有设置有第一外部开口的第一站,用于使印刷电路板能够通过其传送到加热室中,以便被焊接在其中并且还设置有第一内部开口,第二站设置有 第二外部开口,用于使焊接的印刷电路板能够从加热室输送出去,并且还设置有第二内部开口和具有一个端部开口和相对端部开口的管道,该一个端部开口连接到 第一站的第一内开口和与第二站的第二内开口连接的相对端开口,第一内开口的一端开口面积大于第一外开口的面积, 第二内开口和相对端开口大于第二外开口的面积。

    Method of forming a multilayer printed circuit board and apparatus
therefor
    77.
    发明授权
    Method of forming a multilayer printed circuit board and apparatus therefor 失效
    形成多层印刷电路板的方法及其装置

    公开(公告)号:US4908087A

    公开(公告)日:1990-03-13

    申请号:US332377

    申请日:1989-03-31

    摘要: A method and an apparatus of forming a multilayer printed circuit board which can positively remove voids in the prepregs in the printed board and enhance the reliability of the produced printed circuit board and is superior in economy, wherein a laminated assembly of a plurality of printed circuit board components and a plurality of prepregs alternately laminated on each other is sandwiched between upper and lower jig plates, and the laminated assembly sandwiched between the jig plates is clamped between heating plates of a bonding press to heat the assembly to a predetermined temperature, and, thereafter, a pressure is applied to the upper and lower jig plates so as to urge them against each other for bonding the printed circuit board component and the prepregs. An exterior pressurizing means is provided around the printed circuit board components and the prepregs sandwiched between the upper and lower jig plates in order to prevent the molten prepregs from flowing outwardly, thereby raising the fluid pressure of the molten prepregs to squeeze out air bubbles existing in the prepregs.

    摘要翻译: 一种形成多层印刷电路板的方法和装置,其可以肯定地去除印刷电路板中的预浸料坯中的空隙,并提高所制造的印刷电路板的可靠性,并且经济性优异,其中多个印刷电路板 夹板组件和交替层叠在一起的多个预浸料坯被夹在上夹具板和下夹具板之间,并且夹在夹具板之间的层叠组件夹在粘合压力机的加热板之间以将组件加热至预定温度, 此后,向上下夹具板施加压力,以便将它们彼此推压以粘合印刷电路板部件和预浸料。 在印刷电路板部件和夹在上夹具板和下夹具板之间的预浸料坯周围设置有外部加压装置,以防止熔融预浸料坯向外流出,从而提高熔融预浸料坯的流体压力以挤出存在于 预浸料

    Error correction system for difference set cyclic code in a teletext
system
    79.
    发明授权
    Error correction system for difference set cyclic code in a teletext system 失效
    图文电视系统差分集循环码误差校正系统

    公开(公告)号:US4675868A

    公开(公告)日:1987-06-23

    申请号:US716044

    申请日:1985-03-26

    IPC分类号: H03M13/43 H04N7/035 G06F11/10

    CPC分类号: H04N7/0357 H03M13/43

    摘要: An error correction system for a difference set cyclic (272,190) code with 190 data bits and 82 test bits in a coded transmission teletext system which transmits character information on the vertical blanking interval of a television signal has been improved in peripheral circuits for operating an error correction circuit. A first improvement is to correct only designated packets which are in frame synchronization condition and/or designated by an index register. A second improvement is to handle shortened (L,k) code where L is less than 272, using common hardware. A third improvement is selection of three operational modes of data to be corrected. In the first mode, uncorrected data is supplied by an external circuit, and said uncorrected data is stored temporarily in a buffer memory, and corrected data is stored in said buffer memory again to supply external circuit corrected data. Transfer of data between the buffer memory and the error correction circuit is handled by wired logic hardware apparatus. In a second mode, uncorrected data and corrected data are provided in a buffer memory but no external circuit is concerned in operation of the present system. In a third mode, no buffer memory is used, and an external circuit supplies uncorrected data to an error correction circuit directly and receives corrected data directly from the error correction circuit.

    摘要翻译: 在用于在电视信号的垂直消隐间隔上发送字符信息的编码的传输图文电视系统中具有190个数据位和82个测试位的差分循环(272,190)码的纠错系统已被改进,用于操作错误 校正电路。 第一改进是仅校正处于帧同步状态的指定分组和/或由索引寄存器指定的分组。 第二个改进是使用通用硬件来处理L小于272的缩短(L,k)码。 第三个改进是选择要纠正的三种数据操作模式。 在第一模式中,未校正的数据由外部电路提供,并且所述未校正的数据被临时存储在缓冲存储器中,并且校正的数据被再次存储在所述缓冲存储器中以提供外部电路校正的数据。 缓冲存储器和纠错电路之间的数据传输由有线逻辑硬件设备来处理。 在第二模式中,未校正的数据和校正数据被提供在缓冲存储器中,但是在本系统的操作中没有外部电路。 在第三模式中,不使用缓冲存储器,并且外部电路将未校正的数据直接提供给纠错电路,并直接从纠错电路接收校正数据。

    N-Substituted-tetrahydroisophthalimide derivatives
    80.
    发明授权
    N-Substituted-tetrahydroisophthalimide derivatives 失效
    N-取代的四氢间苯二甲酰亚胺衍生物

    公开(公告)号:US4472190A

    公开(公告)日:1984-09-18

    申请号:US409182

    申请日:1982-08-18

    CPC分类号: C07D307/90 A01N43/12

    摘要: A new N-substituted tetrahydroisophthalimde derivative represented by the formula: ##STR1## Wherein R.sub.1 and R.sub.2 are hydrogen or halogen, R.sub.3 is hydrogen or lower alkyl and R.sub.4 is alkyl which may be substituted by halogen or lower alkoxy, and preparation methods thereof and herbicidal composition comprising one or more of said derivatives as active ingredients, is disclosed.

    摘要翻译: 一种新的由下式表示的N-取代的四氢间苯二胺衍生物衍生物:其中R1和R2是氢或卤素,R3是氢或低级烷基,R4是可被卤素或低级烷氧基取代的烷基,其制备方法 并且包含一种或多种所述衍生物作为活性成分的除草组合物。