ADIN2111BCPZ-R7 datasheet(26/129 Pages) AD

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Data Sheet

ADIN2111

BRINGING UP 10BASE-T1L LINKS

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Rev. A | 26 of 129

(PHY 1) and P1_SWPD_EN (PHY 2) hardware configuration pin

signals.

Switch Initialization

After power-up, hardware reset, or software reset, the ADIN2111

switch can be configured via the SPI. Configure the Interrupt Mask

interrupt pin (IMASK1) register to enable interrupts as required.

Write CONFIG0 and CONFIG2 to set up the required functionality

of the switch. For example, set the OPEN Alliance chunk size or

enable cut through, if required.

When the switch is configured, write 1 to the SYNC field in the

CONFIG0 register to indicate that the switch configuration is com-

plete.

The default frame forwarding operation of the switch can

be configured via the P1_FWD_UNK2P2, P2_FWD_UNK2P1,

P1_FWD_UNK2HOST, and P2_FWD_UNK2HOST bits in the Con-

figuration Register 2 (CONFIG2). The filtering table also needs to

be configured. See the Frame Forwarding on Receive section for

more details.

Configuring the Device for Linking

After power-up or reset, configure the ADIN2111 for the desired

operation for linking. The ADIN2111 may already be configured as

required by the hardware configuration pins, but greater control is

available using the management registers via the SPI.

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 master and which as slave. Autonegotiation

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

Autonegotiation is enabled by default for the ADIN2111 PHYs,

and it is strongly recommended to always keep autonegotiation

enabled. Autonegotiation is defined by the IEEE standard and in-

cludes a number of mechanisms to ensure robust linking operation

between PHYs. Autonegotiation is the fastest way to bring up a link.

Configuration of Transmit Level Mode

The ADIN2111 PHYs 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 in

the 10BASE-T1L PMA status register (B10L_PMA_STAT) on the

respective PHY 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 ADIN2111 PHYs 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.

Each PHY of the ADIN2111 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.

1.0 V p-p transmit level operation is required for intrinsically safe

operation.

Enable High Voltage Transmit Ability

The high voltage transmit ability is set on Port 1 (respectively Port

2) using the P1_TX2P4_EN (respectively P2_TX2P4_EN) hardware

configuration pin signal. This signal internally sets the high voltage

transmit ability bit B10L_TX_LVL_HI_ABLE (read only), for each

PHY, as described 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 the 10BASE-T1L high level transmit operating mode ability bit

(AN_ADV_B10L_TX_LVL_HI_ABL) in the BASE-T1 autonegotiation

advertisement register, Bits[47:32] (AN_ADV_ABILITY_H) 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 on PHY 1 or PHY

2, set the 10BASE-T1L high level transmit operating mode request

bit (AN_ADV_B10L_TX_LVL_HI_REQ) in the BASE-T1 autonego-

tiation advertisement register, Bits[47:32] (AN_ADV_ABILITY_H) to

1 on the respective PHY. Note that autonegotiation determines the

transmit 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 on PHY

1 or PHY 2, set the AN_ADV_B10L_TX_LVL_HI_REQ bit in

the BASE-T1 autonegotiation advertisement register, Bits[47:32]

(AN_ADV_B10L_TX_LVL_HI_REQ) to 0 on the respective PHY.

Note that autonegotiation determines the transmit level at which the

link operates.

Enable 1.0 V p-p Transmit Level Only

If it is required to only operate the PHY 1 or PHY 2 at the 1.0

V p-p transmit level operation, set the 10BASE-T1L high level trans-

mit operating mode ability bit (AN_ADV_B10L_TX_LVL_HI_ABL)

in the BASE-T1 autonegotiation advertisement register, Bits[47:32]

(AN_ADV_ABILITY_H) to 0 so that the 2.4 V p-p transmit level

operation is not advertised.

In this case, autonegotiation can only resolve to the 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

characteristics of the cable, it may not be possible to bring up a link

at the 1.0 V p-p operation.

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