ADIN1101CCPZ-R7 datasheet(14/79 Pages) AD

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Data Sheet

ADIN1101

THEORY OF OPERATION

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Rev. A | 14 of 79

Transmit Amplitude Resolution

Overview

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

►

Autonegotiation and transmit level operating mode selection

If the ADIN1101 is configured in high voltage mode, the autonego-

tiation process determines the level to use based on the link partner

capabilities.

Determination of Transmit Level Resolution

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 or the 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, the PHY can only request operation at

the 2.4 V p-p transmit level.

Software Configuration

The ADIN1101 transmit level can also be configured in software us-

ing the following 10BASE-T1L autonegotiation advertisement bits:

►

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 with the TX2P4_EN

hardware configuration pin signal to configure the two autonegotia-

tion advertisement bits through software. See the Transmit Ampli-

tude section for details.

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

operation, clear the AN_ADV_B10L_TX_LVL_HI_ABL bit, so that

2.4 V p-p transmit level operation is not advertised. In this case, au-

tonegotiation can only resolve to 1.0 V p-p transmit level operation,

irrespective of the setting that the remote PHY advertises.

Table 11. Determination of Transmit Level by Autonegotiation

AN_LP_ADV_B10L_TX_LVL_HI_ABL

AN_LP_ADV_B10L_TX_LVL_HI_REQ AN_ADV_B10L_TX_LVL_HI_ABL AN_ADV_B10L_TX_LVL_HI_REQ

Transmit

Level

1.0 V p-p

2.4 V p-p

1 X means don't care.

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