內(nèi)容參考講稿

MT62536LLayout

RoutingConceptMT6253isSOC.ItcontainsRF/BB/PMUfunctioninonechip.SoitwillbemorecomplicatedthanotherBBchip.StaggerballMT6253’sballoutisstaggertype,itwillbemoreflexiblethanlineartypefor RoutingConceptRoutingDuetothe6layerPCBand4miltracestructure,weneedtoroutemostoftraceinlayer2andlayer4andlayer5.Someexamplesareshownasbelowfordifferentsituation.Normal Top L2 L3第一排pin第一排pin是讓球的設(shè)計,好讓Top層可以出線到第三排部分的pin,也可以讓最後排的出線減少,埋孔就會跟著減少。因此Top層的出線就如同上圖所示,類似金字塔的方式帶出即可。Layer2的出線方式與Top層金字塔出線方式一樣,出線可由第三排到第五排部分的pin。不過請盡量錯開Top層與L2的走線,不要重疊。因為L1&L2之間的板厚只剩下的部份第五排pin與第六排pin就需要打埋孔由Layer4/5帶出,如上圖所示。請盡量調(diào)整埋 RoutingNormaltrace/spacing:4/4Via 4/12 12/20LayerLayer1:Layer2:Layer3:Layer4:Layer5:(MainlyGNDplaneDontroutetracesinbottom&toplayerswouldbethebest.) Layer在6層板的phonelayout中,L3是主地，但通常Bottom/Top層會被拿來當做地,因此Bottom/Top層GND的完整性也很重要。 LayerDefinitionLayer1:Layer2Signal---水平走線Layer3:Layer4Signal---垂直走線Layer5Signal---垂直走線Layer6:考慮的因素有以下：Top/Bot是元件層，L3是GND，希望重要信號線可以立體包地，所以盡量用元件是上下分布，BB出線整體往上，BB從L4/L5出線的比較多，避免多換層及包地的良，垂直方向走L4/L5，水平方向走 StandardplacementrulearoundMT6253J AscloseasJI C)SAW AscloseasID) ClosetoSAWE NearGF)RF AscloseasGAG)PMU ClosetoPMUAEH) NearEFI og NearFDJ)BB AscloseasD RoutingRF RX&

GoodGNDshieldingRX& RoutingRF AsshortasRefertolayer3GNDandkeepoutlayer2GNDXtalGNDshouldbeconnectedtolayer3GNDdirectly(DonotconnecttoL1/L2Gnddirectly) RoutingRF shouldbeconnectedtoGND RoutingPMU

IQsignaljustforEVBtest,wedon’tneeditinphonestructure. RoutingPartI:MemoryMemorysignalshouldberouted RoutingPartII:memorylayout

L2traceL3trace由於要盡量把L4/L5由於要盡量把L4/L5的空間留由於memory線都走在L1&L2,因此CLK已經(jīng)無法做到上下左右完整的包地,建議可以將CLK走在L2,並盡量做好左右 RoutingCamera&LCMCamera&LCMsignalshouldberoutedininnerlayer.CMMCLK&CMPCLKshouldhaveGNDshielding RoutingRFcontrolKeepawayfromBT_CLK,itneedsgoodGND RoutingTouchPanel&SIM&APC TouchPanel&APC&signalshouldhave RoutingAudioAudiosignalshouldhaveGNDSpeakersignalsneedhighpower,sothetracewidthshouldbe20mil. RoutingUART&T-Flash&TestfunctionJustfanoutthispartandkeepawayfromthehighsensitive Routing

AsshortasGNDplanein RoutingBT&KeypadBT_CLK32s