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1. 发明申请

US20020109533A1 AUTOMATIC FREQUENCY RATE SWITCH 有权
标题翻译：自动频率开关
公开(公告)号：US20020109533A1
公开(公告)日：2002-08-15
申请号：US09782789
申请日：2001-02-13
申请人： Exar Corporation
发明人： Roubik Gregorian , Manop Thamsirianunt
IPC分类号： H03K003/00
CPC分类号： H03K5/08 , H03K5/13 , H03K5/135 , H03K2005/00156 , H03K2005/00202 , H04L25/0262 , H04L29/06 , H04L69/18 , H04L69/323
摘要： A method and apparatus for automatically determining the protocol being used from the frequency of an applied clock without the need for a separate pin or switch or a second external clock. The clock's frequency is identified when its frequency falls into the set range for which the apparatus is targeted. Based on the detected frequency in the set range, a mode select signal is generated. The mode select signal causes the chip to configure to the appropriate frequency for that mode, as well as any other unique configuration parameters. In one embodiment, the invention generates a ramp signal triggered by the external clock (which is the clock frequency for the desired protocol). The clock is simultaneously applied to a counter. When the ramp signal reaches a reference voltage, the count of the counter is compared to at least one threshold to determine to which frequency it corresponds. In response to this determination, the chip is configured according to the communication mode or protocol indicated. This may be simply the appropriate frequency, but, depending upon the chip, may include pulse shaping, framing and other configuration selections.
摘要翻译：一种用于根据所施加时钟的频率自动确定正在使用的协议的方法和装置，而不需要单独的引脚或开关或第二外部时钟。当其频率落入设备所针对的设定范围内时，识别时钟的频率。基于检测到的设定范围内的频率，生成模式选择信号。模式选择信号使芯片配置为该模式的适当频率，以及任何其他唯一的配置参数。在一个实施例中，本发明产生由外部时钟（其是期望协议的时钟频率）触发的斜坡信号。时钟同时应用于计数器。当斜坡信号达到参考电压时，将计数器的计数与至少一个阈值进行比较，以确定其对应的频率。响应于该确定，芯片根据指示的通信模式或协议进行配置。这可能只是适当的频率，但是，取决于芯片，可能包括脉冲整形，成帧和其他配置选择。

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