The invention relates to universal serial bus circuits utilized in USB devices and USB hubs. Specifically, the invention relates to circuitry used to detect whether the hub or device is connected to a USB host, i.e. to detect connection status of the device or hub. The present invention provides a USB...http://www.google.com/patents/US7533209?utm_source=gb-gplus-sharePatent US7533209 - Universal serial bus circuit which detects connection status to a USB host
