88e3015 Marvell Semiconductor, Inc., 88e3015 Datasheet - Page 31

• Manufacturer Part Number: 88e3015
• Description: Integrated 10/100 Fast Ethernet Transceiver
• Manufacturer: Marvell Semiconductor, Inc.

2.3.5 Auto-Negotiation
The 88E3015/88E3018 device can auto-negotiate to operate in 10BASE-T or 100BASE-TX
If Auto-Negotiation is enabled, then the 88E3015/88E3018 devices negotiate with the link partner to determine the
speed and duplex with which to operate. If the link partner is unable to Auto-Negotiate, the 88E3015/88E3018
devices go into the parallel detect mode to determine the speed of the link partner. Under parallel detect mode, the
duplex mode is fixed at half-duplex.
2.3.5.1
Auto-Negotiation is initiated upon any of the following conditions:
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Changes to the AnegEn, SpeedLSB, and Duplex bits (Registers 0.12, 0.13, and 0.8, respectively) do not take
effect unless one of the following takes place:
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The Auto-Negotiation Advertisement register (Register 4) is internally latched once every time Auto-Negotiation
enters the ability detect state in the arbitration state machine. Hence, a write into the Auto-Negotiation Advertis-
ment Register has no effect once the 88E3015/88E3018 devices begin to transmit Fast Link Pulses (FLPs). This
guarantees that a sequence of FLPs transmitted is consistent with one another.
The Next Page Transmit register (Register 7) is internally latched once every time Auto-Negotiation enters the
next page exchange state in the arbitration state machine.
2.3.5.2
The 88E3015/88E3018 devices support the use of next page during Auto-Negotiation. By default, the received
base page and next page are stored in the Link Partner Ability register - Base Page (Register 5). The 88E3015/
88E3018 devices have an option to write the received next page into the Link Partner Next Page register - Regis-
ter 8 - (similar to the description provided in the IEEE 802.3ab standard) by programming the Reg8NxtPg bit (PHY
Specific Control Register - Register 16.12).
Copyright © 2006 Marvell
October 26, 2006, Advance
Power up reset
Hardware reset
Software reset
Restart Auto-Negotiation
Transition from power down to power up
Changing from the link-up state to the linkfail state
Software reset (SWReset bit - Register 0.15)
Restart Auto-Negotiation (RestartAneg bit - Register 0.9)
Transition from power down to power up (PwrDwn bit - Register 0.11)
The link goes down
Register Update
Next Page Support
Document Classification: Proprietary Information
CONFIDENTIAL
Transmit and Receive Functions
Doc. No. MV-S103657-00, Rev. C
Page 31