Marvel 88F6281 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
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
U n u s e d I n t e r f a c e
St r a p p i n g
Ethernet SMI
Pull up GE_MDIO.
MPP
Configure any unused MPP pin to GPIO output.
Leave the power supply connected.
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.
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
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
Configure the PEX_CLK_P and PEX_CLK_N signals as inputs, as indicated in
.
SATA
Discard the analog power filters.
SATA0_AVDD/SATA1_AVDD can be left unconnected.
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.
Leave SSCG_AVDD connected to 1.8V.
eFuse
Connect VHV to VDD