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Hot-Plug-ModeOperation
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Figure1-6.DipswitchConfiguration
TheEEPROM(U3)shouldbereconfiguredforhot-plug-modeoperation.SeeSection1.5foran
explanationofhowtoconfiguretheEEPROM.UpondeassertionofPERST,theXIO3130automatically
readsdatafromtheEEPROM.ThisdataisusedtopresetvariousPCIconfigurationregisterbits.For
hot-plug-modeoperation,thedataintheEEPROMconfiguresbitsinthefollowingregisters:
•GPIOBcontrolregister(PCIRegisteroffset:BEhinupstreambridge)
–PCIE_GPIO8_CTL=010b–Port1ACT_BTN0
–PCIE_GPIO9_CTL=100b–Port1ATN_LED0
•GPIOCcontrolregister(PCIregisteroffset:C0hinupstreambridge)
–PCIE_GPIO10_CTL=011b–Port2ACT_BTN1
–PCIE_GPIO11_CTL=101b–Port2PWRFLT1
–PCIE_GPIO12_CTL=101b–Port1PWR_LED0
–PCIE_GPIO13_CTL=110b–Port2PWR_LED1
•GPIODcontrolregister(PCIregisteroffset:C2hinupstreambridge)
–PCIE_GPIO15_CTL=101b–Port1PWRFLT0
–PCIE_GPIO16_CTL=011b–Port2ATN_LED1
SettingthesebitsconfiguresLED1asPWR_LED0forport1andLED2asPWR_LED1forport2.LED3is
notusedinhot-plugmode.LEDs4willbeconfiguredasATN_LED0forport1andLED5willbe
configuredasATN_LED1forport2.Push-buttonswitchSW2istheattentionbuttonforport1andSW3is
theattentionbuttonforport2.
Figure1-7.GPIOControlRegister
4XIO3130EVMSLLU108–July2008
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