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    • 1. 发明申请
    • RAM-DAC FOR TRANSMIT PREEMPHASIS
    • 用于传输预留的RAM-DAC
    • WO2007016274A2
    • 2007-02-08
    • PCT/US2006029241
    • 2006-07-25
    • RAMBUS INCHO ANDREWCHEN FRED FZERBE JARED L
    • HO ANDREWCHEN FRED FZERBE JARED L
    • H04L25/03
    • H04L25/03834H03H17/0294
    • Described are transmitters with RAM-DAC based pre-emphasis filters that can be updated adaptively without interfering with data transmission. The memory within the RAM- DAC is divided into active and inactive memory locations, in which active memory locations are those to be accessed in the near future, and consequently cannot be updated (written to) at a given time due without inducing a read/write conflict. One embodiment monitors incoming memory addresses to find an adequate time window for a write to take place without a read interference. Another embodiment includes two memory blocks with similar address space, one of which may be updated as the other is used to for data transmission. Some embodiments employ a RAM-DAC with reduced memory size and complexity.
    • 描述的是具有基于RAM-DAC的预加重滤波器的发射器,其可以自适应地更新而不干扰数据传输。 RAM-DAC内的存储器被分为有源和非活动存储器位置,其中有效存储器位置是在不久的将来被访问的存储器位置,因此不能在给定时间更新(写入),而不引起读/ 写冲突。 一个实施例监视进入的存储器地址以找到足够的时间窗口,以便在没有读取干扰的情况下进行写入。 另一个实施例包括具有相似地址空间的两个存储器块,其中之一可以被更新,而另一个用于数据传输。 一些实施例采用具有减小的存储器大小和复杂度的RAM-DAC。
    • 4. 发明申请
    • MARGIN TEST METHODS AND CIRCUITS
    • 测量方法和电路
    • WO2004105334A3
    • 2005-06-02
    • PCT/US2004015895
    • 2004-05-20
    • RAMBUS INCGARLEPP BRUNO WCHEN FRED FHO ANDREWSTOJANOVIC VLADIMIR
    • GARLEPP BRUNO WCHEN FRED FHO ANDREWSTOJANOVIC VLADIMIR
    • H04L1/20H04L1/24H04L25/03
    • H04L25/03006H04L1/20H04L1/241H04L1/242
    • Described are methods and circuits for margin testing digital receivers. Some embodiments prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing, while other embodiments rely upon the statistics of sampled data to explore the margin characteristics of received data.
    • 描述了数字接收机边缘测试的方法和电路。 一些实施例可以防止误差响应于错误接收的数据而崩溃,并且因此可用于采用历史数据的接收机中以减少符号间干扰(ISI)。 一些实施例检测未知模式的输入数据流的接收错误,因此可以用于系统内边缘测试。 这样的系统可以适于在设备操作期间动态地改变系统参数,以保持足够的余量,尽管由于例如系统噪声环境的波动。 温度和电源电压变化。 还描述了绘制和解释由所公开的方法和电路产生的滤波和未滤波的误差数据的方法。 一些实施例对误差数据进行滤波以便于特定于图案的边缘测试,而其他实施例依赖于采样数据的统计来探索接收数据的边缘特性。