ADIN1110CCPZ-R7 datasheet(16/104 Pages) AD

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Data Sheet

ADIN1110

HARDWARE CONFIGURATION PINS

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Rev. 0 | 16 of 104

The ADIN1110 can operate in unmanaged or managed applica-

tions. In unmanaged applications, it is possible to configure the

desired link configuration of the MAC-PHY from hardware configu-

ration pins without any software intervention. After coming out of

reset, the MAC-PHY attempts to bring up a link. Note that for

an unmanaged application, the MAC-PHY must not be hardware

configured to enter software power-down mode.

In managed applications, software is available to configure the

MAC-PHY via the management interface. In this case, the user can

configure the MAC-PHY to enter software power-down after reset.

Software can then intervene to configure the device as required

and bring the device out of software power-down to allow linking to

establish.

Hardware configuration pins are often shared with functional pins,

and the voltage level on the pin is sensed and latched upon exiting

from a reset. All hardware configuration pins are 2-level sense

using a pull-down or pull-up resistor.

HARDWARE CONFIGURATION PIN

FUNCTIONS

The following functions are configurable from the ADIN1110 hard-

ware configuration pins:

►

Software power-down mode after reset

►

Transmit amplitude configuration

►

Master/slave selection

►

SPI protocol configuration

All of the hardware configuration pins have internal pull-down resis-

tors. The default mode of operation without any external resistors

connected to these pins is shown in Table 10. If an alternative mode

of operation is required, use 4.7 kΩ pull-up resistors.

Table 10. Default Hardware Configuration Modes

Hardware Configuration Pin Function Default Mode

Software Power-Down Mode after

Reset

PHY in software power-down mode

after reset

Master/Slave Selection

Prefer slave

Transmit Amplitude

1.0 V p-p and 2.4 V p-p

SPI Protocol Configuration

OPEN Alliance protocol with protection

Software Power-Down After Reset

If the ADIN1110 is configured so that it does not enter software

power-down mode after reset, the ADIN1110 starts autonegotiation

when it exits reset and attempts to bring up a link after autonego-

tiation completes. If the ADIN1110 is configured so that it enters

software power-down mode after reset, the ADIN1110 waits in

software power-down mode until it is configured over the SPI.

At this point, the PHY configuration can be set to exit software

power-down by software.

Table 11. Software Power-Down (Hardware Configuration)

Software Power-Down Configuration

SWPD_EN

PHY in software power-down after reset

PHY not in software power-down

Master/Slave Preference

The MS_SEL hardware configuration pin is shared with the

TS_TIMER pin and configures the default master/slave selection.

If MS_SEL is pulled low during power-up or reset, the device

is configured by default to prefer slave (this is the case if no

external pull-up resistor is connected to the MS_SEL pin due to the

presence of the internal pull-down resistor). If MS_SEL is pulled

high during power-up or reset, the device is configured by default to

prefer master.

If autonegotiation is disabled, MS_SEL sets the default mas-

ter/slave selection. Autonegotiation is enabled by default for the

ADIN1110 and it is strongly recommended that autonegotiation is

always enabled.

During autonegotiation, when prefer slave is selected and the

remote end is prefer or forced master, the local PHY is set to slave

(and remote to master). When the remote end is prefer or forced

slave, the local PHY is set to master (and remote to slave).

Table 12. Master/Slave Selection (Hardware Configuration)

Master/Slave Selection

MS_SEL

Prefer Slave Selection

Prefer Master Selection

Transmit Amplitude

The TX2P4_EN hardware configuration pin allows the user to

configure the required transmit amplitude mode for the intended ap-

plication (see Table 13). If TX2P4_EN is pulled low, the ADIN1110

is configured by default to support both 1.0 V p-p and 2.4 V p-p

transmit levels, decided by autonegotiation. If TX2P4_EN is pulled

high, the ADIN1110 is configured to disable 2.4 V p-p transmit

operating mode by default and operate with 1.0 V p-p transmit

level only. If the TX2P4_EN pin is strapped high (1.0 V p-p only),

the associated register cannot be changed through the SPI. For

example, 2.4 V p-p operation is not possible if the ADIN1110 is

hardware pin configured for 1.0 V p-p only.

The 1.0 V p-p transmit operating mode supports the spur use case

and can operate at a lower AVDD_H supply voltage of 1.8 V. This

supports intrinsic safe applications.

The higher transmit operating mode of 2.4 V p-p supports trunk

applications and requires a higher AVDD_H supply voltage of 3.3

V. This mode can be used for longer cable lengths in industrial

Ethernet environments with high noise levels.

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