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    • 1. 发明申请
    • Method and apparatus for providing internal table extensibility with external interface
    • 提供内部表扩展性与外部接口的方法和装置
    • US20050086374A1
    • 2005-04-21
    • US10687785
    • 2003-10-17
    • Gaurav SinghFrederick GrunerBrian Yang
    • Gaurav SinghFrederick GrunerBrian Yang
    • G06F15/16H04L12/56H04L29/06
    • H04L45/00H04L45/54H04L45/742H04L49/90H04L69/12
    • A configurable lookup table extension system including a plurality of lookup tables arranged in an internal memory, an external memory, and a flexible controller configured to couple at least one of the plurality of lookup tables to the external memory through a single memory interface is disclosed. Implementations of this system can support the flexible allocation of IP and MAC table entries so that a router/switch can flexibly support applications suited to a particular allocation. This approach provides an efficient scheme for extending multiple internal tables to external memory via a single external interface. Further, such extensibility is also programable to allow the size and number of external tables to be configured by software. This solution can provide the flexibility of customizing table sizes for different markets and/or customer requirements.
    • 公开了一种可配置的查找表扩展系统,其包括布置在内部存储器中的多个查找表,外部存储器和被配置为通过单个存储器接口将多个查找表中的至少一个耦合到外部存储器的灵活控制器。 该系统的实现可以支持IP和MAC表项的灵活分配,使得路由器/交换机可以灵活地支持适合于特定分配的应用。 这种方法提供了一种通过单个外部接口将多个内部表扩展到外部存储器的有效方案。 此外,这种可扩展性也是可编程的,以允许通过软件配置外部表的大小和数量。 该解决方案可以为不同市场和/或客户需求定制表格大小提供灵活性。
    • 9. 发明授权
    • Driving method of speaker and the driving circuit thereof
    • 扬声器的驱动方法及其驱动电路
    • US07499557B1
    • 2009-03-03
    • US09399729
    • 1999-09-20
    • Brian YangKuo-hsiang ChenFu-yuan Cheng
    • Brian YangKuo-hsiang ChenFu-yuan Cheng
    • H04R3/00
    • H03M1/68H03F3/217H03K7/08H03M1/745H03M1/822
    • The present invention relates to a driving method of speaker and the driving circuit thereof by employing the technique of converting digital sound signals into corresponding driving signals to drive the speaker. The driving method of the speaker comprises the steps of dividing the digital sound data into higher bits data group and lower bits data group, converting one data group into driving signals represented as pulse height, and modulating the other data group into driving signals represented as pulse width. The driving circuit comprises pulse width modulation (PWM) circuit for modulating one data group into driving signals represented as pulse width and digital analog conversion circuit for converting the other data group into driving signals represented as pulse height.
    • 扬声器的驱动方法及其驱动电路技术领域本发明涉及扬声器的驱动方法及其驱动电路,该方法采用将数字声音信号转换成相应的驱动信号来驱动扬声器的技术。 扬声器的驱动方法包括以下步骤:将数字声音数据分割为较高位数据组和低位数据组,将一个数据组转换为表示为脉冲高度的驱动信号,并将另一数据组调制为表示为脉冲的驱动信号 宽度。 驱动电路包括用于将一个数据组调制为表示为脉冲宽度的驱动信号的脉宽调制(PWM)电路和用于将另一数据组转换为表示为脉冲高度的驱动信号的数字模拟转换电路。