ADIN1100BCPZ-R7 datasheet(16/80 Pages) AD

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Data Sheet

ADIN1100

THEORY OF OPERATION

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Rev. B | 16 of 80

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 ADIN1100 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

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. But it can only request operation at the 2.4 V p-p

transmit level.

Software Configuration

The ADIN1100 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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