ADIN2111CCPZ-R7 datasheet(14/125 Pages) AD

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Data Sheet

ADIN2111

THEORY OF OPERATION

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Rev. 0 | 14 of 125

►

AN_ADV_B10L_TX_LVL_HI_REQ: advertisement of the

10BASE-T1L high level transmit operating mode request bit

►

B10L_TX_LVL_HI: 10BASE-T1L transmit voltage amplitude con-

trol bit

Table 11. AN_ADV_B10L_TX_LVL_HI_ABL Settings

Bit Setting

Description

Support 1.0 V p-p transmit level only

Support both 1.0 V p-p and 2.4 V p-p transmit level

Table 12. AN_ADV_B10L_TX_LVL_HI_REQ Settings

Bit Setting

Description

Request 1.0 V p-p transmit level

Request 2.4 V p-p transmit level

High Voltage Transmit Level Request

The two PHYs of the ADIN2111 can be configured to advertise

a request for the 2.4 V p-p transmit level using the 10BASE-

T1L high level transmit operating mode ability advertisement bit

(AN_ADV_B10L_TX_LVL_HI_ABL) on the respective PHY. Note

that the 2.4 V p-p transmit level must be enabled using the

P1_TX2P4_EN (respectively P2_TX2P4_EN) hardware configura-

tion pin signal to enable the high voltage request advertisement on

Port 1 (respectively Port 2).

Link Partner Transmit Level Advertisement

The high level transmit information advertised from the link partner

can be read using the following bits on each of the ADIN2111

PHYs:

►

AN_LP_ADV_B10L_TX_LVL_HI_ABL: link partner 10BASE-T1L

high level transmit operating mode ability

►

AN_LP_ADV_B10L_TX_LVL_HI_REQ: link partner 10BASE-T1L

high level transmit operating mode request

These bits update during the autonegotiation process and are valid

when the autonegotiation complete register bit (AN_COMPLETE) is

set on the respective PHY.

Transmit Amplitude Resolution

Autonegotiation supports the following features to define the trans-

mit amplitude to use between a local node and its link partner:

►

Advertise the high voltage transmit ability from the local node

►

Request to use the high voltage transmit level from the local

node

►

Read the link partner transmit level ability and transmit level

request

►

Select the autonegotiation and transmit level operating mode

If the ADIN2111 PORT1 PHY (respectively Port 2 PHY) is config-

ured in high voltage mode, the autonegotiation process determines

the level to use on the PORT1 PHY (respectively Port 2 PHY)

based on the link partner capabilities.

Determination of Transmit Level Resolution

For a 10BASE-T1L link, if either the local or remote PHY advertises

that it is not capable of supporting 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, the result

is operation at the 1.0 V p-p transmit level.

If both the local and remote PHYs advertise 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, the result is operation at

the 2.4 V p-p transmit level.

Thus, a PHY can ensure that the device must operate at the 1.0 V

p-p transmit level. However, it can only request operation at the 2.4

V p-p transmit level.

Software Configuration

The ADIN2111 transmit level on the Port 1 PHY (respectively Port

2 PHY) can also be configured in software using the following

10BASE-T1L autonegotiation advertisement bits on the respective

PHY:

►

AN_ADV_B10L_TX_LVL_HI_ABL: high level transmit operating

mode ability bit

►

AN_ADV_B10L_TX_LVL_HI_REQ: high level transmit operating

mode request register bits

The higher transmit level must be enabled on Port 1 (respectively

Port 2) with the P1_TX2P4_EN (respectively P2_TX2P4_EN) hard-

ware configuration pin signal to configure the two autonegotiation

advertisement bits through software. See the Transmit Amplitude

section for details.

If it is required to only operate the Port 1 PHY (respectively Port 2

PHY) at the 1.0 V p-p transmit level operation, clear the respective

AN_ADV_B10L_TX_LVL_HI_ABL bit, 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 the

setting that the remote PHY advertises.

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