845e电脑主板电路原理图

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1、54321APPENDIXCIntel(R)845EInteractiveClientReferenceDesignRevisionX2DDLastChange:2002-09-26#SchematicPagePrefixNetobjectChangesfromX1toX21COVERSHEETA_CRITICALANALOGTRACES1AllBAT54A(0-0031-1261)changedtoBAT54(0-0031-1104)duetowrongpolarity2BLOCKDIAGRAMAC_AC97SIGNAL2R712changedfrom10kto

2、15ktoadjustvoltage3BLOCK-POWERAPIC_APICSIGNAL3PUR756andR757added@U38.15(PG_VDDR)andU38.16(PG_V1V5)4MECH-ROUTEAUD_ANALOGAUDIOSIGNAL4NetonpinsU3.54andU3.55separated(BSEL[0..1])duetonamingerror5NOTES5PUR758addedatCN34.7(SYS_RESET#)6CPU-P4BUSCK_CLOCKSIGNAL6PUR759addedatU39.4(VIDPWRGD)7CPU

3、-P4POWER7C717changedfrom4u7to1uEEn_SERIALEEPROMLANn8CPU-ITP8R607notpopulatedEN_ENABLEFORPOWERSOURCES9R571andR572notpopulated(FWHTestPins)9MCH-SYSBUS&CLOCKF_FLOPPYDISKSIGNAL10R585andR586notpopulated(forLVDS18Bit)10MCH-AGP&DDRFWH_FIRMWAREHUBSIGNAL11R760andC741addedtoU7.50togenerateaV_3V

4、3SBinputdelayforresumereset11MCH-POWER12R501andR494notpopulatedduetoPCIconfigofLAN82540CG_AGPBUSSIGNALC12CLK-ICS95020113U36FWHsymbolchangedduetowrongpinout(Pin23,24and25)GND_GNDSIGNALDERIVED14R496changedto4k7andsettoGND(PDM66EN)13DDR-DIMM0GNDGNDPOWER15R525andR499isnowpopulated14DDR-DI

5、MM1H_P4HOSTBUSSIGNAL16R530notpopulatedduetowrongV_2V5LANvoltage15ICH4-SYSBUS&PCI17U20.G4isnow51RPulldowntoGNDI2C_I2CBUSSIGNAL16ICH4-LPC&IDE&USB18U20.H4isnow33RPulluptoV_3V3LANIDE_IDESIGNAL17ICH4-POWER19AC97Fixup(AC_SDIN0->ChangedtoAC_SDIN2onICH4)INT_INTERRUPTSIGNAL20SwapICH4PinN20andP

6、21(H_HISTB+/H_HISTB-)duetowronginfoinyellowcover18GLUELOGICKB_KEYBOARDSIGNAL21LAN82540Fixup(R519populatedwith0R,R517changedto2K49andR513changedto330R)19SIO0-LPC47M10722R615changedto4K32duetoCougarBugL_LPCBUSSIGNAL20SIO1-LPC47N22723HWRevchangedto2atGlueLogicLANn_LANCONTROLLERnSIGNAL24R

7、373isnowpopulatedwith10M21CONN-COM1/COM2/LPTLP_LPT1284SIGNAL25CN12.4mustbeisolatedcauseofshortcutofAUD_MIC_BIAStoGND22CONN-COM3/COM4/KBCM_MEMORYBUSSIGNAL26PUR761-R765addedtoVID[0:4]23AC97-AD1885MIDI_MIDISIGNAL27PUR766addedtoU23.15,PDR767addedtoU23.14(Panellinkstrappingoptions)MS_MOUSE

8、SIGNA