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    • 3. 发明授权
    • Programmable array interconnect latch
    • 可编程阵列互连锁存器
    • US5732246A
    • 1998-03-24
    • US480639
    • 1995-06-07
    • Scott Whitney GouldFrank Ray Keyser, IIIWendell Ray LarsenBrian Allen Worth
    • Scott Whitney GouldFrank Ray Keyser, IIIWendell Ray LarsenBrian Allen Worth
    • H03K19/173G01R31/3185H03K3/037H03K19/177G06F9/455G06F17/50
    • G01R31/318519H03K19/17704H03K19/17748H03K3/0375
    • A given interconnect of a programmable gate array includes a programmable repeater circuit that enables selective isolation and testing of a select block of configured circuitry within the programmable gate array. The programmable repeater circuit includes an input node coupled to a first portion of the given interconnect and an output node coupled to a second portion of the given interconnect. A selective buffer circuit selectively outputs a buffered output signal to the output node that is related to a logic state at the input node. A signal storage circuit is also connected to the input node for selectively storing the logic state received from the input node. In a further embodiment, the signal storage circuit comprises an LSSD register. A primary latch of the LSSD register receives data selectively either from the input node, in accordance with a first clock signal, or alternatively from a secondary serial input node, in accordance with a second clock signal. A secondary latch of the LSSD register is selectively coupled, per a third clock signal, to receive and latch therein latched data of the primary latch. Data representative of data latched within the secondary latch is provided at a secondary serial output, and selectively provided at the primary output node when enabled per a programmable enable signal. In yet a further embodiment, the LSSD register is part of a serial scan chain for selectively interfacing an interconnect boundary of the select block of the configured circuitry within the programmable gate array.
    • 可编程门阵列的给定互连包括可编程中继器电路,其实现对可编程门阵列内的配置电路的选择块的选择性隔离和测试。 可编程中继器电路包括耦合到给定互连的第一部分的输入节点和耦合到给定互连的第二部分的输出节点。 选择性缓冲电路有选择地将缓冲的输出信号输出到与输入节点处的逻辑状态相关的输出节点。 信号存储电路也连接到输入节点,用于选择性地存储从输入节点接收的逻辑状态。 在另一实施例中,信号存储电路包括LSSD寄存器。 根据第二时钟信号,LSSD寄存器的主锁存器根据第一时钟信号,或者备选地从辅助串行输入节点选择性地从输入节点接收数据。 每个第三时钟信号选择性地耦合LSSD寄存器的辅助锁存器,以在其中接收并锁存主锁存器的锁存数据。 在辅助锁存器中锁存的数据的数据被提供在次级串行输出端,并且当每个可编程使能信号使能时,被选择地提供在主输出节点处。 在又一个实施例中,LSSD寄存器是串行扫描链的一部分,用于选择性地接合可编程门阵列内的配置电路的选择块的互连边界。
    • 4. 发明授权
    • Method and apparatus for Viterbi detection of generalized partial response signals including two-way add/compare/select for improved channel speed
    • 用于维特比检测广义部分响应信号的方法和装置,包括双向加法/比较/选择以提高通道速度
    • US06373906B1
    • 2002-04-16
    • US09768802
    • 2001-01-24
    • Roy Daron CideciyanJonathan Darrel CokerEvangelos S. EleftheriouRichard Leo GalbraithAllen Prescott HaarFrank Ray Keyser, IIIDavid James Stanek
    • Roy Daron CideciyanJonathan Darrel CokerEvangelos S. EleftheriouRichard Leo GalbraithAllen Prescott HaarFrank Ray Keyser, IIIDavid James Stanek
    • H04L2706
    • H04L1/0054H04L25/497
    • Apparatus is provided for implementing high-speed and area efficient architectures for Viterbi detection of generalized partial response signals including two-way add/compare/select for improved channel speed. The two-way add/compare/select includes a two-way compare for comparing first and second state metric input values and a pair of two-way adds in parallel with the two-way compare for respectively adding the first and second state metric input values with a second input value. The second input value includes a time varying term or a constant term. The time varying terms are expressed as outputs Zn of a partial matched filter or as outputs Wn of a matched filter. A multiplexer is coupled to the pair of two-way adds, the multiplexer receiving a selectable input controlled by the two-way compare. A pair of shifts coupled between the pair of two-way adds and the multiplexer receive a shift control input for providing metric bounding to avoid underflow. The two-way compare for comparing first and second state metric input values can include a hard shift for providing an add for the first state metric input value and then a compare between a resultant first state metric input value and the second state metric input value.
    • 提供了用于实现用于维特比检测广义部分响应信号的高速和区域高效架构的装置,包括用于改善信道速度的双向加法/比较/选择。 双向加法/比较/选择包括用于比较第一和第二状态度量输入值的双向比较以及用于分别添加第一和第二状态度量输入的双向比较并行的一对双向加法 具有第二个输入值的值。 第二输入值包括时变项或常数项。 时变项表示为部分匹配滤波器的输出Zn或匹配滤波器的输出Wn。 多路复用器耦合到一对双向加法器,多路复用器接收由双向比较控制的可选输入。 耦合在一对双向加法器和多路复用器之间的一对移位器接收用于提供度量限制以避免下溢的移位控制输入。 用于比较第一和第二状态度量输入值的双向比较可以包括用于为第一状态度量输入值提供加法,然后在得到的第一状态度量输入值与第二状态度量输入值之间进行比较的硬移位。