ADIN1100CCPZ-R7 datasheet(28/80 Pages) AD

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Data Sheet

ADIN1100

BRINGING UP 10BASE-T1L LINKS

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Rev. B | 28 of 80

bit, B10L_TX_LVL_HI_ABLE (read only), is set automatically to the

defined hardware configuration as follows:

►

B10L_TX_LVL_HI_ABLE = 0: 1.0 V p-p only ability

►

B10L_TX_LVL_HI_ABLE = 1: 1.0 V p-p and 2.4 V p-p ability

See the Configuration of Transmit Level Mode section for more

details.

Advertise High Voltage Transmit Ability

Set the AN_ADV_B10L_TX_LVL_HI_ABL bit to 1 to advertise the

high level transmit mode to the link partner during autonegotiation.

This bit can only be set if the ADIN1100 has the ability to transmit in

high voltage mode (B10L_TX_LVL_HI_ABLE = 1).

High voltage transmit ability only enables the ADIN1100 to adver-

tise support for both 2.4 V p-p and 1.0 V p-p levels. The selected

level is determined by autonegotiation with the link partner.

See the Transmit Amplitude Advertisement section for more details.

Advertise a Request for High Voltage Transmit

Level

Set the AN_ADV_B10L_TX_LVL_HI_REQ bit to 1 to advertise a re-

quest for 2.4 V p-p transmit level operation during autonegotiation.

This bit can only be set if the ADIN1100 has the ability to transmit in

high voltage mode (B10L_TX_LVL_HI_ABLE = 1).

See the Transmit Amplitude Advertisement section for more details.

Read Link Partner Advertised Transmit Level

The link partner advertised transmit information can be

read using the link partner high level transmit operating

mode ability bit (AN_LP_ADV_B10L_TX_LVL_HI_ABL) and the

link partner high level transmit operating mode request bit

(AN_LP_ADV_B10L_TX_LVL_HI_REQ). These bits are valid when

the autonegotiation is completed (AN_COMPLETE = 1).

See the Transmit Amplitude Advertisement section for more details.

Completion of Autonegotiation

When autonegotiation has completed, the autonegotiation complete

indication register bit (AN_LINK_GOOD) is set. This bit indicates

the completion of the autonegotiation sequence and that the ena-

bled PHY link is setting up or active.

When autonegotiation has completed and the link is up, the autone-

gotiation complete register bit (AN_COMPLETE) is set to 1 and the

contents of the following registers are valid:

►

BASE-T1 autonegotiation advertisement registers

►

AN_ADV_ABILITY_L: Bits[15:0]

►

AN_ADV_ABILITY_M: Bits[31:16]

►

AN_ADV_ABILITY_H: Bits[47:32]

►

BASE-T1 autonegotiation link partner base page ability registers

►

AN_LP_ADV_ABILITY_L: Bits[15:0]

►

AN_LP_ADV_ABILITY_M: Bits[31:16]

►

AN_LP_ADV_ABILITY_H: Bits[47:32]

Link Status

The status of the link can be determined by reading the link status

When read as 1, this bit indicates that a valid link has been

established.

If this bit reads 0, it means that the link has failed since the last time

it was read. This bit latches low. Thus, if a 0 is read, this bit must

be read a second time to determine if the link status has come up in

the interim (see the Latch Low Registers section).

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

cally. Autonegotiation can be restarted by request through a write

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

TROL register (see the BASE-T1 Autonegotiation Control Register

section).

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