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123 2F886-2-66202225886-2-22234362www.zeroplus.com.tw2F., No.123, Jian 8th Rd., Zhonghe Dist.,New Taipei City 23585, Taiwan ,R.O.C.Tel: 886-2-66202225Fax: 886-2-22234362USB 2.0 Signal Analysis SkillsPrefaceUSB is a common Serial Protocol which supports the hot plugging. When the USB Deviceis plugged into the Host, the Host will detect it and the software will plan to use it, plug and play.The USB can provide the power for the Device with DC+5V voltage and 100mA~500mAcurrent.There are four connection wires for USB. Two are power and ground wires, the other twoare signal wires: D+ and D-. Generally, the signals of the two wires are opposite, in other words,if the signal of one wire is High, the signal of the other wire is Low. Such differential signal canimprove the abilities of anti-noise and anti-interference; USB just uses this differential signal ofD+ and D- wires to transmit with high speed.When no Device connects with the USB Host, the 1.5K Ohm Resistance on the D+ and Dwill ground to ensure the two wires grounding. It supports 127 addresses at most, which means,one USB system can support 127 Devices at most. The Host will periodically inquire each Hubto get the connection state of each Device. Take USB 2.0 for an example, USB 2.0 has threemodes: Low Speed, Full Speed and High Speed; the speed for each mode is 1.5M/s, 12M/s and480M/s in sequence respectively. In the High Speed mode, the width of ea ...


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