88e3016 Marvell Semiconductor, Inc., 88e3016 Datasheet - Page 27

• Manufacturer Part Number: 88e3016
• Description: Integrated 10/100 Fast Ethernet Transceiver
• Manufacturer: Marvell Semiconductor, Inc.

If the 1.2V regulator is not used, AVDDR must still be tied to 2.5V.
2.5.4 AVDDX
AVDDX is used as the3.3V supply to the external regulator that generates the 2.5V supply.
If the 2.5V regulator is not used, then the CTRL25 pin should be left floating. In this particular case when the 2.5V
regulator is not used, the AVDDX should be left floating.
AVDDX must be supplied externally. Note that this supply must be the same voltage as AVDDC.
2.5.5 DVDD
DVDD is used as the 1.2V digital supply.
DVDD can be supplied externally with 1.2V, or via the 1.2V regulator.
All DVDD pins should be shorted together. A decoupling capacitor should be attached to pin 13 of the 88E3016
device.
2.5.6 VDDO
VDDO supplies the non-RGMII digital I/O pins. The voltage range is 2.5V or 3.3V.
VDDO must be supplied externally. Do not use the 2.5V regulator to power VDDO.
2.5.7 VDDOR
VDDOR supplies the RGMII digital I/O pins. The voltage should be 2.5V or 3.3V.
VDDOR must be supplied externally. Do not use the 2.5V regulator to power VDDOR.
Three options are supported:
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•
•
The VREF pin should be set to 0.5 x VDDOR for SSTL_2 behavior.
The VREF pin should be tied to VDDOR for LVCMOS behavior.
Note that 3.3V SSTL_2 is not supported.
Copyright © 2006 Marvell
May 4, 2006, Advance
2.5V LVCMOS
3.3V LVCMOS
2.5V SSTL_2
Document Classification: Proprietary Information
CONFIDENTIAL
Regulators and Power Supplies
Doc. No. MV-S103164-00, Rev. --
Page 27