Texas Instruments XIO3130 EVM manual Hot-Plug-Mode Operation, Gpio Control Register

www.ti.com Hot-Plug-Mode Operation

Figure 1-4. GPIO Control Register

∙General control register (PCI register offset: D4h in each downstream bridge)

–RCVR_PRSNT_EN = 0b – PRSNT pin is used to determine whether slot is present

–REFCK_DIS = 0b – REFCK enabled

–LINK_ACT_RPT_CAP = 1b – Slot is link active reporting capable

–SLOT_PRSNT = 1b – Port connected to slot

∙General slot info register (PCI register offset EEh in each downstream bridge)

–SLOT_NUM = 1b for slot 1, 2b for slot 2, and 3b for slot 3

1.3Hot-Plug-Mode Operation

In hot-plug mode, the EVM board utilizes the TPS2363 PCIe server dual-slot hot-plug controller to switch power on and off to slots 1 and 2. The TPS2363 is directly controlled by the hot-plug controller built into the XIO3130. Slot 3 operates in normal mode. To configure the EVM for hot-plug operation, the six jumpers (J7, J11, J13, J14, J15, J16) must be removed (see Figure 1-5).

Figure 1-5. Power Jumpers

The dipswitch should be configured with SCL, DN1_DPSTRP and DN2_DPSTRP slide switches in the up position, and DN3_DPSTRP slide switches in the down position (see Figure 1-6). This configuration enables the EEPROM and enables hot-plug operation on slots 1 and 2.

SLLU108–July 2008 XIO3130 EVM 3

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