ADIN1110BCPZ-R7 datasheet(13/107 Pages) AD

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Data Sheet

ADIN1110

THEORY OF OPERATION

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Rev. B | 13 of 107

MASTER/SLAVE CONFIGURATION

The 10BASE-T1L standard uses a master/slave clock scheme. This

scheme is commonly used in full duplex transceiver standards with

echo cancellation.

On a 10BASE-T1L link, one PHY is designated as the master, and

the other PHY as the slave. Autonegotiation is used to determine

which PHY is the master and which is the slave. Master and slave

assignment does not generally matter.

Software Configuration

The master and slave configuration bit (CFG_MST) is used to

configure the PHY role. This bit is only used when autonegotiation

is disabled. Otherwise, this bit is set or reset during the autonego-

tiation process (see the Autonegotiation section).

Table 9. CFG_MST Settings

Bit Setting

Description

Prefer slave

Prefer master

AUTONEGOTIATION

The ADIN1110 uses the autonegotiation capability in accordance

with IEEE 802.3 Clause 98, providing a mechanism for exchanging

information between PHYs to allow link partners to agree to a

common mode of operation. During the autonegotiation process,

the PHY advertises its own capabilities and compares to those

received from the link partner. The concluded operating mode is

the transmit amplitude mode and master/slave preference common

across the two devices.

If a link is dropped, the autonegotiation process restarts automati-

cally. An autonegotiation restart can also be requested by writing

to the autonegotiation restart bit (AN_RESTART) in the autonego-

tiation control register.

The autonegotiation process takes some time to complete, depend-

ing on the number of pages exchanged, but is always the fastest

way to bring up a link. Clause 98 of the IEEE 802.3 standard details

the timers related to autonegotiation.

Note that autonegotiation is enabled by default for the ADIN1110,

and it is strongly recommended that autonegotiation is always

enabled.

Transmit Amplitude Resolution

Autonegotiation is used to resolve the transmit amplitude resolution.

The PHY can be configured to support both 1.0 V p-p and 2.4 V

p-p transmit levels or to operate with 1.0 V p-p transmit level only

through the hardware configuration (see Table 15). This configura-

tion can also be done in software using the 10BASE-T1L high level

transmit operating mode ability (AN_ADV_B10L_TX_LVL_HI_ABL)

and 10BASE-T1L high level transmit operating mode request

(AN_ADV_B10L_TX_LVL_HI_REQ) register bits.

To operate at 2.4 V p-p transmit level, both the local and remote

PHYs must advertise that they are capable of operating at 2.4

V, and at least one PHY must request 2.4 V p-p transmit level

operation.

If it is required to only operate the PHY at 1.0 V p-p transmit

level operation, AN_ADV_B10L_TX_LVL_HI_ABL must be 0 so

that 2.4 V p-p transmit level operation is not advertised. In this

case, autonegotiation can only resolve to 1.0 V p-p transmit level

operation, irrespective of what setting the remote PHY advertises.

Master/Slave Resolution

Autonegotiation is also used to resolve master or slave status. The

PHY can be configured to prefer slave or prefer master through

the hardware configuration (see Table 14). If autonegotiation is

disabled, the MS_SEL hardware configuration pin sets the default

master/slave selection. Note that the recommended use of the

ADIN1110 is with autonegotiation enabled.

During autonegotiation, when prefer slave is selected, and the

remote end is prefer or forced master, the local PHY is set to slave

(and remote to master). When the remote end is prefer or forced

slave, the local PHY is set to master (and remote to slave).

MDI

The media dependent interface (MDI) connects the ADIN1110 to

the Ethernet network via a twisted wire pair.

The ADIN1110 requires an external hybrid between the TXN/TXP

and RXN/RXP pins and the twisted wire pair. This external hybrid

allows the system to have full duplex communication by removing

the local transmit signal from the combined signal on the cable,

leaving the desired receive signal.

The ADIN1110 hybrid requires a specific topology and values for

proper operation. Figure 10 shows the topology and values for

the components. Consider the size, power, and voltage rating of

these components in the context of other system requirements, for

example, requirements of intrinsic safety.

Figure 10. Recommended Hybrid for the ADIN1110

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