Scannable storage cell and method of operation
    21.
    发明授权
    Scannable storage cell and method of operation 失效
    可扫描存储单元和操作方法

    公开(公告)号:US5719878A

    公开(公告)日:1998-02-17

    申请号:US566813

    申请日:1995-12-04

    IPC分类号: G01R31/3185 G01R31/28

    CPC分类号: G01R31/318555

    摘要: Circuitry (20) and an associated an method of operation provides system data (30) and scan data (32) to a latch portion (42) of a data storage element in a reduced setup time period. For each data storage element, a system data transfer gate (22) provides system data (30) to a master latch portion (42) while a scan data transfer gate (24) provides scan data (32) to the master latch portion (42). The scan data (24) and system data transfer (22) gates minimize the set-up time required for data entering the data storage element. Scan chains incorporating the data storage elements include scan data input ports and scan data output ports as well as connections between data storage elements in an associated scan chain. A controller (26) operated by a scan enable signal (38) and a system clock (40) provide control signals to the system data transfer gate (22) and the scan data transfer gate (24) to cause the gates to selectively pass data. The controller 26 serves as a multiplexor function for scan data and system data, and serves a clocking loading minimizing function to speed the data path.

    摘要翻译: 电路(20)和相关联的操作方法在缩短的建立时间段内向数据存储元件的锁存部分(42)提供系统数据(30)和扫描数据(32)。 对于每个数据存储元件,系统数据传输门(22)向主锁存部分(42)提供系统数据(30),而扫描数据传输门(24)向主锁存部分(42)提供扫描数据(32) )。 扫描数据(24)和系统数据传输(22)门最小化数据进入数据存储元件所需的建立时间。 结合数据存储元件的扫描链包括扫描数据输入端口和扫描数据输出端口以及相关扫描链中的数据存储元件之间的连接。 由扫描使能信号(38)和系统时钟(40)操作的控制器(26)向系统数据传输门(22)和扫描数据传输门(24)提供控制信号,以使门选择性地传递数据 。 控制器26用作扫描数据和系统数据的多路复用器功能,并且提供用于加速数据路径的时钟负载最小化功能。

    Serial scan chain architecture for a data processing system and method
of operation
    22.
    发明授权
    Serial scan chain architecture for a data processing system and method of operation 失效
    串行扫描链架构,用于数据处理系统和操作方法

    公开(公告)号:US5592493A

    公开(公告)日:1997-01-07

    申请号:US304968

    申请日:1994-09-13

    IPC分类号: G01R31/3185 G01R31/28

    摘要: A scan chain architecture which has a controller (10), and a multiplexer (24) is used to route test data through functional units (12, 14, 16, 18, 20, and 22). The controller (10) receives as input a serial data stream from an STDI terminal and demultiplexes this data stream to one of the functional units (six functional units are illustrated in FIG. 1). Each of the functional units is considered as one scan chain and therefore FIG. 1 has six scan chains (one for each functional unit). In addition, a seventh scan chain couples all output flip-flops in each of the functional units together between an output of the MUX (24) and the STDO terminal/pin. Therefore, a serial scan of a data stream can be done through one functional unit, the multiplexer (24) and into the output flip-flops of each function unit to make testing easier to set-up. In addition, various new scan chain cells and low power methods are used herein.

    摘要翻译: 具有控制器(10)和多路复用器(24)的扫描链架构用于通过功能单元(12,14,16,18,20和22)路由测试数据。 控制器(10)作为输入接收来自STDI终端的串行数据流,并将该数据流解复用于功能单元之一(图1中示出了六个功能单元)。 每个功能单元被认为是一个扫描链,因此, 1具有6个扫描链(每个功能单元一个)。 此外,第七扫描链将MUX(24)的输出和STDO端子/引脚之间的每个功能单元中的所有输出触发器耦合在一起。 因此,可以通过一个功能单元,多路复用器(24)和每个功能单元的输出触发器来完成数据流的串行扫描,以使测试更容易设置。 此外,在本文中使用各种新的扫描链单元和低功率方法。