ADIN1300BCPZ-R7 datasheet(21/96 Pages) AD

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Data Sheet

ADIN1300

THEORY OF OPERATION

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Rev. B | 21 of 96

interface and is being transmitted to the MAC, or during a false

carrier event (in 100BASE-TX mode). The CRS pin indicates the

presence of a carrier to the MAC, while the COL pin is asserted in a

collision condition.

For the transmit interface, the PHY generates a 25 MHz or 2.5 MHz

reference clock on TX_CLK. The MAC transmits data on the TXD_x

transmit pin that is synchronized with TX_CLK. The MAC asserts

the TX_EN pin to indicate to the ADIN1300 that transmission

data is available on the TXD_x transmit data lines. Because the

TX_ER pin is not used in 10BASE-Te mode, and it is only used in

100BASE-TX mode for forward error propagation and for EEE low

power idle (LPI) request, TX_ER is only supported when EEE is

enabled via the hardware configuration pins (see Table 14).

RMII Interface Mode

Figure 24. RMII MAC-PHY Interface Signals

This interface is capable of supporting 10 Mbps and 100 Mbps

data rates. A single 50 MHz reference clock (REF_CLK) is sourced

from the MAC to PHY (or from an external source) to the XTAL_I/

CLK_IN/REF_CLK pin for both the transmit and receive interfaces.

The receive data (RXD_0 pin and RXD_1 pin), transitions syn-

chronously to the reference clock (REF_CLK). The carrier sense/

received data valid signal (CRS_DV) is a combination of the CRS

and RX_DV signals and is asserted while the receive medium is

nonidle. The CRS_DV is asserted asynchronously to REF_CLK

and deasserted synchronously. RX_ER is also synchronous to

REF_CLK, and is asserted when an error is detected in the re-

ceived frame or when a false carrier is detected in 100BASE-TX.

RX_ER assertion on a false carrier can be disabled by software.

The MAC transmits the TXD_0 pin and TXD_1 pin synchronously

to REF_CLK, and asserts TX_EN to indicate to the ADIN1300 that

transmission data is available on the TXD_0 pin and TXD_1 pin

lines.

AUTONEGOTIATION

The ADIN1300 includes autonegotiation capability in accordance

with IEE 802.3 Clause 28, providing a mechanism for exchanging

information between PHYs to allow link partners to agree to a

common mode of operation at the highest supported speed. During

the autonegotiation process, the PHYs advertise their own capabil-

ities and compares to those received from the link partner. The

concluded operating mode is the highest speed capability and

duplex setting common across the two devices.

In the event of the link being dropped, the autonegotiation process

restarts automatically.

Autonegotiation can be restarted by request through a write to the

RESTART_ANEG bit field in the MII register.

The autonegotiation process takes some time to complete, depend-

ing on the number of pages exchanged. Clause 28 of the IEEE

802.3 standard details the timers related to autonegotiation.

Master/Slave Resolution

For 1000BASE-T links, autonegotiation is also used to resolve

master or slave status. The PHY can be configured to prefer

master or slave through the hardware configuration or manually

configured for fixed master or slave through the MSTR_SLV_CON-

TROL register, Bit 11 and Bit 12 (MAN_ MSTR_ADV bit and

MAN_MSTR_SLV_EN_ADV bit, respectively). If the user chooses

to manually fix this configuration, they must configure each side of

the link differently.

Polarity Inversion Correction

The ADIN1300 is capable of detecting if the proper polarity is

present on the cable and adjust the polarity if not. If polarity

inversion has been detected, it is identified in the PHY_STATUS_1

Automatic MDI Crossover

The ADIN1300 is capable of distinguishing if a straight or cross-

over cable is connected between the link partners. The ADIN1300

automatically detects and sets the MDI configuration to match its

receiver to that of the remote transmitter, thereby avoiding need for

crossover cables or cross-wired cables. Details on the automatic

MDI/MDIX process is included in Clause 40, Section 40.8.2. This

feature is configured through the hardware strapping configuration

(see Table 26) or, alternatively, can be changed through software

access via the MDIO interface.

AUTONEGOTIATION DISABLED

Autonegotiation is always used for a 1000BASE-T link, as required

by the IEEE standards. 10BASE-Te or 100BASE-TX can use or

disable autonegotiation. When autonegotiation is disabled, the PHY

is configured for a single speed and the user must ensure that both

sides of the link are configured properly. See Table 25 for more

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