LAN8710AI datasheet(26/82 Pages) MICROCHIP

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Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

Datasheet

Revision 1.4 (08-23-12)

SMSC LAN8710A/LAN8710Ai

DATASHEET

3.1.4.3

10M Receive Data Across the MII/RMII Interface

For MII, the 4-bit data nibbles are sent to the MII block. In MII mode, these data nibbles are valid on

the rising edge of the 2.5 MHz RXCLK.

For RMII, the 2-bit data nibbles are sent to the RMII block. In RMII mode, these data nibbles are valid

on the rising edge of the RMII REF_CLK.

3.1.4.4

Jabber Detection

Jabber is a condition in which a station transmits for a period of time longer than the maximum

permissible packet length, usually due to a fault condition, which results in holding the TXEN input for

a long period. Special logic is used to detect the jabber state and abort the transmission to the line

within 45ms. Once TXEN is deasserted, the logic resets the jabber condition.

As shown in Section 4.2.2, "Basic Status Register," on page 53, the Jabber Detect bit indicates that a

jabber condition was detected.

3.2

Auto-negotiation

The purpose of the auto-negotiation function is to automatically configure the transceiver to the

optimum link parameters based on the capabilities of its link partner. Auto-negotiation is a mechanism

for exchanging configuration information between two link-partners and automatically selecting the

highest performance mode of operation supported by both sides. Auto-negotiation is fully defined in

clause 28 of the IEEE 802.3 specification.

Once auto-negotiation has completed, information about the resolved link can be passed back to the

controller via the Serial Management Interface (SMI). The results of the negotiation process are

reflected in the Speed Indication bits of the PHY Special Control/Status Register, as well as in the Auto

Negotiation Link Partner Ability Register. The auto-negotiation protocol is a purely physical layer

activity and proceeds independently of the MAC controller.

The advertised capabilities of the transceiver are stored in the Auto Negotiation Advertisement

options.

The following blocks are activated during an Auto-negotiation session:

Auto-negotiation (digital)

100M ADC (analog)

100M PLL (analog)

100M equalizer/BLW/clock recovery (DSP)

10M SQUELCH (analog)

10M PLL (analog)

10M Transmitter (analog)

When enabled, auto-negotiation is started by the occurrence of one of the following events:

Hardware reset

Software reset

Power-down reset

Link status down

Setting the Restart Auto-Negotiate bit of the Basic Control Register

On detection of one of these events, the transceiver begins auto-negotiation by transmitting bursts of

Fast Link Pulses (FLP), which are bursts of link pulses from the 10M transmitter. They are shaped as

Normal Link Pulses and can pass uncorrupted down CAT-3 or CAT-5 cable. A Fast Link Pulse Burst

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