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    • 2. 发明授权
      US07461286B2 System and method for using a learning sequence to establish communications on a high-speed nonsynchronous interface in the absence of clock forwarding 有权
    • System and method for using a learning sequence to establish communications on a high-speed nonsynchronous interface in the absence of clock forwarding
    • 在没有时钟转发的情况下，使用学习序列建立高速非同步接口的通信的系统和方法
    • US07461286B2
    • 2008-12-02
    • US11433181
    • 2006-05-11
    • Ralph James
    • Ralph James
    • G06F1/04
    • G06F13/4243 , Y10S370/905
    • A memory system includes a memory hub controller that sends write data to a plurality of memory modules through a downstream data bus and receives read data from the memory modules through an upstream data bus. The memory hub controller includes a receiver coupled to the upstream data bus and a transmitter coupled to the downstream data bus. Similarly, each of the memory modules includes a receiver coupled to the downstream data bus and a transmitter coupled to the upstream data bus. Each receiver includes a receive clock generator that is synchronized by coupling a known pattern of data to the receiver. The receiver determines which phase of the receive clock best captures the known pattern and uses that receive clock phase during normal operation.
    • 存储器系统包括存储器集线器控制器，其通过下游数据总线向多个存储器模块发送写入数据，并通过上游数据总线从存储器模块接收读取数据。 存储器集线器控制器包括耦合到上游数据总线的接收器和耦合到下行数据总线的发送器。 类似地，每个存储器模块包括耦合到下游数据总线的接收器和耦合到上游数据总线的发送器。 每个接收机包括通过将已知模式的数据耦合到接收器来同步的接收时钟发生器。 接收机确定接收时钟的哪个相位最佳地捕获已知模式，并在正常操作期间使用该接收时钟相位。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 4. 发明授权
      US06895248B1 Dynamic resource allocation and media access control for a wireless ATM network 失效
    • Dynamic resource allocation and media access control for a wireless ATM network
    • 无线ATM网络的动态资源分配和媒体访问控制
    • US06895248B1
    • 2005-05-17
    • US09324367
    • 1999-06-02
    • Bora A. Akyol , Donald C. Cox
    • Bora A. Akyol , Donald C. Cox
    • H04L12/28 , H04L12/56 , H04Q7/20
    • H04W72/0446 , H04L12/5601 , H04L2012/5632 , H04W28/14 , H04W28/26 , H04W72/0413 , H04W74/00 , H04W74/04 , Y10S370/905
    • A resource allocation method for use in a wireless ATM network comprises receiving on a wireless signaling channel a request for access to a shared frequency-time sliced wireless medium. A channel matrix is then searched for a set of available frequency-time slots. The channel matrix represents a time frame within the shared frequency-time sliced wireless medium, and is used to keep track of resource allocation in the time-frequency sliced medium. The set of available time-slots is then allocated if the allocation does not violate a frequency switching constraint, and if the set of available frequency-time slots contains a number of slots no smaller than a requested number of slots. In a preferred embodiment of the invention, the searching step uses a greedy resource allocation strategy to search a channel-chunk matrix comprising a list of contiguous chunks of available time slots in each frequency of the shared frequency-time sliced wireless medium. The greedy resource allocation strategy comprises the following successive allocation steps: searching for a single contiguous set of available time slots in a single frequency, where the size of the set of available slots is equal to the requested size [60]; searching for a single contiguous set of available time slots in a single frequency, where the size of the set of available slots is greater than the requested size [64]; searching for separate chunks of available time slots in a single frequency [66]; and searching for separate chunks of available time slots in multiple frequencies [68]. Each allocation step comprises checking whether the allocation violates a frequency switching constraint.
    • 一种在无线ATM网络中使用的资源分配方法包括在无线信令信道上接收对共享的时分片式无线介质的访问请求。 然后，搜索一组可用频率时隙的信道矩阵。 信道矩阵表示共享时间分片无线介质内的时间帧，用于跟踪时间频率分片介质中的资源分配。 然后如果分配不违反频率切换约束，则分配可用时隙的集合，并且如果可用频率时隙的集合包含不少于所请求的时隙数量的时隙数量。 在本发明的优选实施例中，搜索步骤使用贪心资源分配策略来搜索包含共享时分片无线介质的每个频率中可用时隙的连续块的列表的信道块矩阵。 贪心资源分配策略包括以下连续分配步骤：在单个频率中搜索可用时隙的单个连续集合，其中可用时隙集合的大小等于所请求的大小[60]; 在单个频率中搜索单个连续的可用时隙集合，其中所述可用时隙集合的大小大于所请求的大小[64]; 在单个频率中搜索单独的可用时隙块[66]; 并在多个频率中搜索单独的可用时隙块[68]。 每个分配步骤包括检查分配是否违反频率切换约束。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 7. 发明授权
      US6122337A Modular circuitry architecture for residual time stamp service clock regenerator phase locked loop 失效
    • Modular circuitry architecture for residual time stamp service clock regenerator phase locked loop
    • 用于剩余时间戳服务时钟再生器锁相环的模块化电路架构
    • US6122337A
    • 2000-09-19
    • US3296
    • 1998-01-06
    • Scott Bleiweiss , Peter Chantiles
    • Scott Bleiweiss , Peter Chantiles
    • H03L7/099 , H04J3/06 , H04L12/70 , H04Q11/04 , H03D3/24 , H04L12/56
    • H04J3/0632 , H03L7/0992 , H04Q11/0478 , H04L2012/5674 , Y10S370/905
    • A service clock regenerator regenerates a local clock from time stamps of a remote clock transmitted over a network by determining the slope of (or difference between current and previous) time stamps of the remote clock and the slope of time stamps of the local clock. A phase difference is formed as the difference between the slope of the time stamps of the remote clock and the slope of the time stamps of the local clock and this phase difference is accumulated to generate a phase error signal. The phase error signal is filtered to generate a frequency adjustment signal having a magnitude that depends on the phase error signal. The frequency of the local clock is adjusted according to the magnitude of the frequency adjustment signal thereby reducing a phase difference between the remote time stamps and the local time stamps. The (local service) clock signal has a nominal frequency of Fc/(N+K/L) Hz over each successive interval of L periods, where N, K and L are integers, and L>K (where K can be the above noted frequency adjustment signal). Each set of L periods includes a first set of K periods and a second set of L-K periods. These two sets of periods are organized by interleaving two or more non-null subsequences of periods of the first set with two or more non-null subsequences of periods of the second set. During each period of one of the subsequences of the first set, the clock is outputted with a frequency of Fc/N Hz. Likewise, during each period of one of the subsequences of the second set, the clock is outputted with a frequency of Fc/(N+1) Hz. A service clock regeneration system with multiple service clock regenerator modules is also provided. A combined service clock regenerator/synchronous residual time stamp generator is furthermore provided.
    • 服务时钟再生器通过确定远程时钟的（或当前和之前的）时间戳的斜率和本地时钟的时间戳的斜率之间，通过网络发送的远程时钟的时间戳从时间戳重新生成本地时钟。 形成相位差作为远程时钟的时间戳的斜率与本地时钟的时间戳的斜率之间的差，并且该相位差被累积以产生相位误差信号。 相位误差信号被滤波以产生具有取决于相位误差信号的幅度的频率调整信号。 根据频率调整信号的幅度来调整本地时钟的频率，从而减少远程时间戳与本地时间戳之间的相位差。 （本地服务）时钟信号在L个周期的每个连续间隔中具有Fc /（N + K / L）Hz的标称频率，其中N，K和L是整数，并且L> K（其中K可以是上述 记录频率调节信号）。 每组L个周期包括第一组K个周期和第二组L-K周期。 这两组周期通过将第一组的周期的两个或多个非空子序列与第二组的周期的两个或多个非零子序列进行交织来组织。 在第一组的一个子序列的每个周期期间，以Fc / NHz的频率输出时钟。 类似地，在第二组的一个子序列的每个周期期间，以Fc /（N + 1）Hz的频率输出时钟。 还提供具有多业务时钟再生器模块的业务时钟再生系统。 此外还提供组合服务时钟再生器/同步剩余时间戳发生器。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Global Dossier Espacenet 法律信息 同族专利 专利引用
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