ADIN1101CCPZ-R7 datasheet(24/79 Pages) AD

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Data Sheet

ADIN1101

BRINGING UP 10BASE-T1L LINKS

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Rev. A | 24 of 79

MMD1_DEV_ID2 contains the OUI, Bits[19:24]

(MMD1_DEV_ID2_OUI), the model number (MMD1_MOD-

EL_NUM), and the revision number (MMD1_REV_NUM). See the

Vendor Specific MMD 1 Device Identifier Low Register section.

Table 22. ADIN1101 Unique Identifier Values

Description

Bit Name

Value

Organizationally Unique Identifier,

Bits[3:18]

MMD1_DEV_ID1

0x283

Organizationally Unique Identifier,

Bits[19:24]

MMD1_DEV_ID2_OUI

0x2F

Model Number, Bits[6:0]

MMD1_MODEL_NUM

0x8

Revision Number, Bits[6:0]

MMD1_REV_NUM

0x1

When a valid read of the IEEE OUI is done, the system ready

bit (CRSM_SYS_RDY) can also be read to verify that the start-up

sequence is complete and the system is ready for normal operation.

The software power-down status bit (CRSM_SFT_PD_RDY) can be

read to check if the device is in the software power-down state. This

bit is also controlled by the SWPD_EN hardware configuration pin

signal.

Configuring the Device for Linking

After power-up or reset, configure the ADIN1101 for the desired

operation for linking. The ADIN1101 may already be configured as

required by the hardware configuration pins, but greater control is

available using the management registers.

The autonegotiation process is used to match the operating mode

between a local and remote PHY. For example, autonegotiation is

used to ensure that the modes agree between the two devices on

which PHY operates as leader and which as follower. Autonegotia-

tion is also used to match the transmit level between the two PHYs.

Autonegotiation is enabled by default for the ADIN1101, and it is

strongly recommended to always keep autonegotiation enabled.

Autonegotiation is defined by the IEEE standard and includes a

number of mechanisms to ensure robust linking operation between

PHYs and is the fastest way to bring up a link.

Configuration of Transmit Level Mode

Overview

The ADIN1101 can support transmit level operation at either 1.0

V p-p or 2.4 V p-p if the B10L_TX_LVL_HI_ABLE bit is set to 1

and a 3.3 V supply is provided on the AVDD_H pins. The higher

transmit level can support longer reach but also has higher power

consumption.

The ADIN1101 can support 1.0 V p-p transmit level operation with a

1.8 V supply on the AVDD_H pins at very low power consumption.

The ADIN1101 can either be configured to advertise support of both

1.0 V p-p and 2.4 V p-p transmit level operation or to advertise

support of only 1.0 V p-p transmit level operation. Refer to the

Transmit Level Mode Advertisement section for more details.

Enable High Voltage Transmit Ability

The high voltage transmit ability is set using the TX2P4_EN hard-

ware configuration pin signal, which internally sets the high voltage

transmit ability bit, B10L_TX_LVL_HI_ABLE (read only), as descri-

bed in the Transmit Amplitude section.

Enable 1.0 V p-p and 2.4 V p-p Transmit Levels

To allow both 1.0 V p-p and 2.4 V p-p transmit level operation, set

AN_ADV_B10L_TX_LVL_HI_ABL to 1 to indicate that the device

is capable of 2.4 V p-p transmit level operation (a 3.3 V supply is

required on the AVDD_H pins).

Set 2.4 V p-p Transmit Level as Preferred

If 2.4 V p-p transmit level operation is preferred, set

AN_ADV_B10L_TX_LVL_HI_REQ to 1 to request 2.4 V p-p trans-

mit level operation. Note that autonegotiation determines the trans-

mit level that the link operates at.

Set 1.0 V p-p Transmit Level as Preferred

If 1.0 V p-p transmit level operation is preferred, set

AN_ADV_B10L_TX_LVL_HI_REQ to 0. Autonegotiation determines

the transmit level that the link operates at.

Enable 1.0 V p-p Transmit Level Only

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

operation, set AN_ADV_B10L_TX_LVL_HI_ABL to 0 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. For very long cable lengths, depending on the charac-

teristics of the cable, it may not be possible to bring up a link at 1.0

V p-p operation.

When the high level transmit is disabled through the RXD_D0/

TX2P4_EN pin, the AVDD_H supply can be supplied from either 1.8

V or 3.3 V for 1.0 V p-p transmit level operation.

Transmit Level Mode Advertisement

Enable High Voltage Transmit Ability

The AVDD_H power rail must be provided with a 3.3 V supply for

the ADIN1101 to support the 2.4 V p-p transmit level.

The high voltage transmit ability is enabled on the ADIN1101 by

setting the TX2P4_EN hardware configuration pin signal low during

power-up, hardware reset, or software reset. The transmit ability

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

defined hardware configuration as follows:

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