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    • 1. 发明授权
    • Bidirectional off-chip driver with receiver bypass
    • 带接收器旁路的双向片外驱动器
    • US5949272A
    • 1999-09-07
    • US873830
    • 1997-06-12
    • Harry Randall BickfordPaul William CoteusWarren Edward MauleRobert Dominick Mirabella
    • Harry Randall BickfordPaul William CoteusWarren Edward MauleRobert Dominick Mirabella
    • H03K19/0185H03K17/62
    • H03K19/018592H03K19/018585
    • A method and apparatus are provided which are implemented in a chip I/O buffer-multiplexor circuit or I/O buffer cell 201. The I/O buffer portion includes a receiver circuit 205 for receiving bus input signals to the buffered chip, and a driver circuit 203 for driving output signals from the buffered chip to a data bus. An integrated multiplexor or MUX circuit 207 selectively gates one of three possible signals to chip internal logic. The three signals applied to the MUX circuit include a boundary scan test signal BS MUX for testing scan points in an integrated circuit, a bypass Data In signal DI which is generated by chip internal drive logic, and a DQ signal received by the I/O buffer receiver circuit from a data bus. The data input node of the I/O buffer is wired directly to the new multiplexor data input. Additional control signals are provided for orthogonal selection of the three multiplexor data inputs.
    • 提供了一种在芯片I / O缓冲多路复用器电路或I / O缓冲器单元201中实现的方法和装置.I / O缓冲器部分包括用于接收到缓冲芯片的总线输入信号的接收机电路205和 用于驱动从缓冲芯片到数据总线的输出信号的驱动器电路203。 集成多路复用器或MUX电路207有选择地将三个可能的信号之一门控到芯片内部逻辑。 施加到MUX电路的三个信号包括用于测试集成电路中的扫描点的边界扫描测试信号BS MUX,由芯片内部驱动逻辑产生的旁路数据输入信号DI和由I / O接收的DQ信号 数据总线缓冲接收电路。 I / O缓冲器的数据输入节点直接连接到新的多路复用器数据输入。 提供附加的控制信号用于三个多路复用器数据输入的正交选择。
    • 8. 发明授权
    • Memory cards with symmetrical pinout for back-to-back mounting in computer system
    • 具有对称引脚排列的存储卡,用于背靠背安装在计算机系统中
    • US06202110B1
    • 2001-03-13
    • US08829020
    • 1997-03-31
    • Paul William CoteusRobert Dominick Mirabella
    • Paul William CoteusRobert Dominick Mirabella
    • G06F1340
    • G11C5/06G06F13/409G11C5/04H05K1/14
    • Memory cards for a computer system are placed back-to-back on an active backplane, using wiring topology where the memory address and data busses are wired to pairs of symmetrical connectors. This topology takes advantage of symmetrical memory card pinouts to improve memory bus performance while reducing backplane cost and wiring complexity. The symmetrical layout of the data and address wiring allows two memory cards to be placed back-to-back on the backplane, maintaining the same relative position of data and address pins between cards. Since the data and most of the address lines are common to each card, and any such data or (common or non-unique) address pin on one card can be wired to any other such data or address pin, respectively, on the other card, the back-to-back arrangement provides for minimal address and data bus interconnect lengths between connectors. Each data signal can be wired from a memory controller data pin on the first connector, then daisy-chained through the short printed circuit card wire to an adjacent pin on the second connector. Likewise, non-unique address pins can be connected from the memory controller to such address pins that are parallel between connectors. Those unique address and control signals which are to be connected together are placed as close as possible to the centerpoint of the edge connector.
    • 计算机系统的存储卡使用布线拓扑将背板背对背放置在有源底板上,其中存储器地址和数据总线连接到成对的对称连接器。 该拓扑结构利用对称的存储卡引脚排列来改善内存总线性能,同时降低了背板的成本和布线的复杂性。 数据和地址布线的对称布局允许两个存储卡背对背地放置在背板上,保持卡之间的数据和地址引脚相同的相对位置。 由于数据和大多数地址线对于每个卡是共同的,并且一个卡上的任何这样的数据或(公共或非唯一)地址引脚可以分别连接到另一个卡上的任何其他这样的数据或地址引脚 ,背对背布置提供了连接器之间的最小地址和数据总线互连长度。 每个数据信号可以从第一个连接器上的存储器控​​制器数据引脚接线,然后通过短的印刷电路卡线菊花链连接到第二个连接器上的相邻引脚。 同样,非唯一地址引脚可以从存储器控制器连接到在连接器之间并行的这样的地址引脚。 要连接在一起的那些独特的地址和控制信号尽可能靠近边缘连接器的中心点。