Marvel Group 88F6281 Computer Hardware User Manual


 
Unused Interface Strapping
Copyright © 2008 Marvell Doc. No. MV-S104859-U0 Rev. E
December 2, 2008, Preliminary Document Classification: Proprietary Information Page 49
2 Unused Interface Strapping
Table 24 lists the signal strapping to be used for systems in which some of the device interfaces are unused (not
connected).
Table 24: Unused Interface Strapping
Unused Interface Strapping
Ethernet SMI Pull up GE_MDIO.
MPP Configure any unused MPP pin to GPIO output.
Leave the power supply connected.
If the related power supply is VDDO, leave it connected to 3.3V.
If the related power supply is VDD_GE_B, leave it connected to either 3.3V or 1.8V.
USB Discard the power filter.
Leave USB_AVDD connected to 3.3V.
All other signals can be left unconnected.
PCI Express Discard the analog power filters.
Leave PEX_AVDD connected to 1.8V.
Pull down the PEX_CLK_N signal through a 50 k
Ω resistor to GND.
Pull up the PEX_CLK_P signal through a 16 k
Ω resistor to 1.8V.
All other signals can be left unconnected.
Configure the PEX_CLK_P and PEX_CLK_N signals as inputs, as indicated in Table 32,
Reset Configuration, on page 67.
SATA Discard the analog power filters.
SATA0_AVDD/SATA1_AVDD can be left unconnected.
RTC Connect RTC_AVDD, RTC_AVSS, RTC_XIN, and RTC_XOUT to GND.
SSCG Discard the power filter.
Leave SSCG_AVDD connected to 1.8V.
eFuse Connect VHV to VDD