公开(公告)号：US06694399B1

公开(公告)日：2004-02-17

申请号：US09661748

申请日：2000-09-14

申请人： Robert Antoine Leydier ,  Taylor Jude Leaming, III

发明人： Robert Antoine Leydier ,  Taylor Jude Leaming, III

IPC分类号： G06K1906

CPC分类号： G06K19/07733 ,  G06F13/385 ,  G06K19/07

摘要： A method and device are disclosed for detecting successful transfers between a Universal Serial Bus (USB) port and a USB smart card and generating a signal that provides an indication of the USB transaction activity. This USB transaction activity signal is modulated according to the USB transaction activity and drives a Light Emitting Diode (LED) in a preferred embodiment of the invention. A counter internal to the USB smart card scales the transaction activity signal such that it is perceptible to the user. Because the current through the LED depends upon the USB transaction activity, the brightness of the LED varies according to the USB transaction activity. The LED may be driven from a current mirror sink or source, or a current switch sink or source.

摘要翻译： 公开了一种用于检测通用串行总线（USB）端口和USB智能卡之间的成功传送并产生提供USB事务活动的指示的信号的方法和装置。 在本发明的优选实施例中，该USB交易活动信号根据USB交易活动进行调制并驱动发光二极管（LED）。 USB智能卡内部的计数器可以缩放交易活动信号，以便用户可以看到。 因为通过LED的电流取决于USB事务活动，所以LED的亮度根据USB事务活动而变化。 LED可以从电流反射镜槽或源，或当前的开关水槽或源驱动。