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Chapter11
SPRUEP9A–May2008
BootModes
TheTMS320DM646xDMSoCARMcanbooteitherfromasynchronousEMIF/NORFlashorfromARM
ROM,asdeterminedbythedeviceconfigurationpins(BTMODE[3:0],CS2_BW,PCIEN,andDSP_BT)at
reset.ThePCIENpinconfigurationisusedtoselectthedefaultconfigurationoftheEMIFA/PCI/HPIpins
atreset.ThisallowstheDM646xDMSoCtobePCI-compliantatreset.PCIEN=1disablestheinternal
pullupandpulldownresistorsonthePCIpinsandconfiguresthepinmuxingforPCI.Forallother
bootmodes(non-PCIbootmode),thePCIENmustbeclearedto0.
ForamoredetaileddescriptionoftheROMbootmodessupportedbytheDM646xDMSoC,seeUsingthe
TMS320DM6467DMSoCBootloader(SPRAAS0).
SPRUEP9A–May2008BootModes121
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