Unused Interface Strapping
3
Unused Interface Strapping
Table 18 lists the signal strapping for systems in which some of the MV78200 interfaces are unused, not connected.
Table 18: Unused Interface Strapping
Unused Interface
Strapping
Ethernet RGMII
If not using Port0, use a 1–4.7 kilohm pull down for the following signals:
GE0_TXCLK, GE0_RXCLK, GE0_RXD[3:0], GE0_RXDV
Ethernet SMI
TWSI
GE_MDIO must be 2 kilohm pulled up.
TWSI0_SCK and TWSI0_SDA must be pulled up through a 1–4.7 kilohm resistor to
VDDO_B.
TWSI1_SCK and TWSI1_SDA must be pulled up through a 1–4.7 kilohm resistor to
VDDO_A.
Device
USB
VDDO_B and VDDO_C power balls must be connected to 3.3V or to 1.8V according to
the corresponding reset strap setting.
Discard the power filter.
Leave USBx_AVDD connected to 3.3V.
All other signals can be left unconnected.
PCI Express 0
PCI Express 1
SATA
Configure it to x4 reset_sampling Dev_AD[3] = 0.
Discard the analog power filters.
Connect PEX1_AVDD to VDD (1V), to save power suppliers.
Pull down the PEX0_CLK_N signal through a 50 kilohm resistor to GND.
Pull up the PEX0_CLK_P signal through a 16 kilohom resistor to VDD.
All other signals can be left unconnected.
Configure it to X4 reset sampling DEV_AD[4] = 0.
Discard the analog power filters.
Connect PEX1_AVDD to VDD (1V),, to save power suppliers.
Pull down the PEX1_CLK_N signal through a 50 kilohm resistor to GND.
Pull up the PEX1_CLK_P signal through a 16 kilohm to VDD.
All other signals can be left unconnected.
Discard the analog power filters and connect it to VDD (1V)
Connect the SATA_USB_RES to 6.04 kilohm resistor to pull down.
All other signals can be left unconnected.
Copyright © 2008 Marvell
MV-S104671-U0 Rev. C
December 6, 2008, Preliminary
Document Classification: Proprietary Information
Page 41
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
