Table Model Computer Motherboard Signal Integrity (SI) Examination Method Design And Application

The signal integrity (Signal Integrity, is called SI) is refers to a signal to have the correctresponse ability in the electric circuit.Has the good signal integrity is refers has achieved thestandard voltage level while the time which needs .The too bad signal integrity is not causes bysome sole factor, but is in the anode design many kinds of factors causes together. Main signalintegrity question including reflection, ringing/rounding, Ground bounce, crosstalk and so on.Now, the high speed digital system signal clock frequency reaches as high as severalhundred megacycles per second, the system has quick slope transient and the extremely highoperating frequency, As well as the electric circuit is crowded, causes the signal integrity (SI)question and the electromagnetic compatibility (EMI) question is day by day serious in the highspeed digital system design domain.Carry out development process of table model computer motherboard in the USI Electronics(Shen zhen) Co., Ltd,needs the signal integrity examination and the optimization circuit design,therefore has this topic.The topic primary intention is, according to the table model computer motherboard designneed, to the signal that various need inspects designs a set of perfect signal integrity (SI)examination method.Including the Clock Gen, PCI&DDRⅡ, SATA& PCI-Express, USB andEthemet five major part examinations.The topic design examination method already succeededapplies in many motherboard case, for example like AM662L-SG95, AT656FX-SD8, SG-X5,IV9 and SIS741GX, accurate, did not have the omission to excavate each cases the signalintegrity (SI) question, proved the topic had the enough practical value.The main text first chapter introduced the significance of the SI examination and this topicresearch primary intention, topic correlation transmission line basic theory, and signal integrity(SI) examination main equipment - oscilloscope and probe, appendix elementary knowledge.From the second chapter, the main length is aims at each kind of signal which the table modelcomputer motherboard needs to inspect: Clock, PCI&DDRⅡ, SATA&PCI-Express, USBand Ethemet。From analysis signal industry standard start, determines each kind of signal the examinationobject; then the choice appropriate examination equipment, explains the examination step exhaustively; and according to each kind of signal integrity (SI) problem which in the actualexamination meets, diagnosis reason,proposes the corresponding solution countermeasure.Topic after each part of examination method application, summarized the common SI problemgeneral solution, that can give PCB and the hardware engineer's design provides certainreference;According to the need, after the hardware design revision, carries out once more thecoherent signal examination, It can guarantee the hardware revision is effective, the examinationis actual and effectiveAt the same time, this examination content including many new technology which applicationon motherboard, follows close on (motherboard) the signal examination technologicaldevelopment, it is in the front of correlative domain temporarily, have to unceasinglyconsummate.