protel99中设置等长线的方法

1、Protel 99se中设置等长线方法等长线作用：1补偿 同一组相关”信号线中的延时（如时钟线）；2滤波电感;3阻抗匹配等。1、首先对要等长的信号线归类（class）。He Edfc View Placea） 点 Design->Netlist Manager.Resign Tools Auto Route ReportsLead Nets.Netlist Manager.Update Schematic.Layer Stack Manager.Split Planes.,.Mechanical Layers.Clares.Fram-To Editor.ft'owse Compc

2、 nEntw.,. Add/Remove Library.,Makie Library Apertue Library,.Mori*.£ | PCB1b） 弹出Netlist Manager对话框。新建一个 class如DATA2，将要等长的 nets添加到DATA2中。Pietlist ManagerPropertiesNet ClassesDATA2Nets In Cta：DOD1D2D3D4D5D6D72、编辑等长的规则。a）单击 Design->Rules# -J > tie Edit View £lace矗色£J昌QQ目Explorer Br

3、owse PCB |BrowseDesign Lods Auto Route RRules.,Load Nets.Netlist Manager., kUpdate Schematic.Layer 5tack Manager,.Spb't Planes.Mechanical Layers.b） 弹出Design Rules对话框，在High Speed标签页中按需求对 Matched Net Lengths进行编辑。（图中的参数是我 随意设置的，只是为了看等长的效果）RoutmoManufadurinaiHiqh Speed Placement| Signal intearity |O

4、ther |Design RuksMartched Net LengthsRule ClassesDaisy Chain Stub Lenolh Length CanstrairrtMatched Hel LengthsMdKimum Via Count ConstraintP«rllel Segmeril Ccwistiidirrt Vids Under SMCJ ConstraintSpecifiei$ Ihe degree tg which neh can have differenl： lengths. Advjn 匚曰 d PCB la cates the langesl

5、net (basecl or the scope and compares it Id each ! Ihe Qtlwf Spscilji ths Consclion ParatnelBrs if fou Advarte&d PCS to 呂lo smslch length 对 the nels. Sections are added when you select T ools-Equahze Ne« Lengtht.AffectedRum DRCu.二MenuHelp3、最后，只要单击 Tool->Equalize Net Lengths 就 OK 了。Tools Alio Route Reports WindowDesign Rule Check.Reset Error MarkersAuto Placement Interactiye PlacementUn-RoijteDensity： MapSignal Integrity.Re-Arinotote.,Crocs ProbeLayer backup LegendConvertTeardrops, h,Miter CornersEqualize Net LengthsOutline Selected ObjectsFind and Set TestpointsC