ADIN1111CCPZ-R7 datasheet(19/109 Pages) AD

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Data Sheet

ADIN1111

BRINGING UP 10BASE-T1L LINKS

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Rev. A | 19 of 109

The ADIN1111 can also be configured to advertise a request for 2.4

V p-p transmit level operation (if B10L_TX_LVL_HI_ABLE = 1). This

is set using the 10BASE-T1L high level transmit operating mode

request bit (AN_ADV_B10L_TX_LVL_HI_REQ). 0 = request 1.0 V

p-p transmit level, and 1 = request 2.4 V p-p transmit level.

The link partner advertised transmit level ability can be read in

the link partner 10BASE-T1L high level transmit operating mode

ability register bit (AN_LP_ADV_B10L_TX_LVL_HI_ABL). The link

partner advertised transmit level request can be read in the link

partner 10BASE-T1L high level transmit operating mode request

updated during the autonegotiation process and are valid when the

autonegotiation complete register bit (AN_COMPLETE) is set.

Operation at the 1.0 V p-p transmit level operation occurs if either

the local or remote PHY advertises that it is not capable of transmit-

ting in the high level (2.4 V p-p) transmit operating mode, or if

neither the local nor remote PHY advertises a request for high level

(2.4 V p-p) transmit operating mode.

Operation at the 2.4 V p-p transmit level occurs if both the local

and remote PHY advertises that they are capable of transmitting in

the high level (2.4 V p-p) transmit operating mode, and if either the

local or remote PHY advertises a request for high level (2.4 V p-p)

transmit operating mode.

Therefore, a PHY can ensure it must operate at 1.0 V p-p transmit

level, but it can only request operation at the 2.4 V p-p transmit

level.

Table 16. Determination of Transmit Level by Autonegotiation1

HI_ABL2

HI_REQ

LP_HI_ABL

LP_HI_REQ

Transmit Level

1.0 V p-p

2.4 V p-p

1 X means don't care.

2 HI_ABL, HI_REQ, LP_HI_ABL, and LP_HI_REQ refer to the advertisement bits

AN_LP_ADV_B10L_TX_LVL_HI_ABL, AN_LP_ADV_B10L_TX_LVL_HI_REQ,

AN_ADV_B10L_TX_LVL_HI_ABL, and AN_ADV_B10L_TX_LVL_HI_REQ, re-

spectively.

Advertisement of Leader/Follower

The 10BASE-T1L standard uses what is known as a leader/follower

clock scheme. This scheme is commonly used in full duplex trans-

ceiver standards using echo cancellation. One PHY is designated

as the leader and the other PHY as the follower. Autonegotiation is

used to agree which PHY is the leader and which is the follower,

and it generally doesn’t matter which PHY is which.

The ADIN1111 has an internal pull-down resistor on the MS_SEL

pin, which results in a default setting of configuring the PHY to

advertise prefer follower. It is recommended to either use the

default setting of advertise prefer follower or to use a setting of

advertise prefer leader.

If it is mandatory for the PHY to operate as leader, use an advertise

forced leader configuration. However, this configuration must be

used with caution because if remote end is also forced leader, there

is a configuration fault, autonegotiation fails, and the link is not

brought up.

The force leader/follower configuration register bit

(AN_ADV_FORCE_MS) is used to configure the PHY to advertise

its leader/follower configuration as a preference or as a forced

value, as follows: 0 = leader/follower configuration is a preferred

mode, and 1 = leader/follower configuration is a forced mode.

The leader/follower configuration register bit (AN_ADV_MST) is

used to configure the PHY to advertise its leader/follower configura-

tion, as follows: 0 = follower and 1 = leader.

The link partner advertised leader/follower setting can be read

in the link partner force leader/follower configuration register bit

(AN_LP_ADV_FORCE_MS) and the link partner leader/follower

configuration register bit (AN_LP_ADV_MST). These bits are up-

dated during the autonegotiation process and are valid when the

autonegotiation complete register bit (AN_COMPLETE) is set.

When the local and remote PHY have the same preferred configu-

ration (for example, both follower or both leader), a random process

is used to determine which is the leader and which is the follower.

When one PHY has a forced configuration, its leader/follower con-

figuration is given priority over a PHY with a preferred setting where

both PHYs have the same leader/follower configuration. If both

PHYs have a forced configuration and the same leader/follower

configuration, configuration fault occurs and autonegotiation fails.

The resolution of leader/follower can be read using the leader/fol-

lower resolution result register bits (AN_MS_CONFIG_RSLTN).

This result indicates if the PHY is configured as a follower or a

leader or if there was a configuration fault. These bits are updated

during the autonegotiation process and are valid when the autone-

gotiation complete register bit (AN_COMPLETE) is set.

ADIN1111CCPZ-R7 数据表(PDF) 19 Page - Analog Devices

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