ADIN1111CCPZ-R7 datasheet(16/109 Pages) AD

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Data Sheet

ADIN1111

HARDWARE CONFIGURATION PINS

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Rev. A | 16 of 109

The ADIN1111 can operate in unmanaged or managed configura-

tions with the use of the hardware configuration pins.

The hardware configuration pins are standard pins with an alternate

bootstrap function. The ADIN1111 reads the configuration pin lev-

el immediately after power-up, hardware reset or software reset,

and configures the PHY settings accordingly. When activated, the

ADIN1111 immediately attempts to bring up a link on the PHY

and the hardware configuration pins can be used with their main

pin function. These pins can be used in unmanaged or managed

configuration.

The unmanaged configuration refers to the ADIN1111 PHY param-

eters being configured by the hardware configuration pins. This

mode can be used when the system requires a static configuration

of the ADIN1111 port settings without the need for software control.

The managed configuration refers to the full control of the

ADIN1111 using software via the SPI. The PHY and the MAC

layer can be configured in software. The configuration pins can

be connected to the external host or hardware configured using

pull-up/pull-down resistors. When active the host controller can

override any of the ADIN1111 configuration with the hardware pins

after power-up, hardware reset or software reset.

HARDWARE CONFIGURATION PIN

FUNCTIONS

The following functions are configurable from the ADIN1111 hard-

ware configuration pins:

►

Software power-down mode after reset

►

Transmit amplitude configuration

►

Leader/follower 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

Leader/Follower Selection

Prefer follower

Transmit Amplitude

1.0 V p-p and 2.4 V p-p

SPI Protocol Configuration

OPEN Alliance protocol with protection

Table 11. Recommended Control for Hardware Configuration Pins

Required Pin

Level

Managed Configuration

Options

Unmanaged Configuration

Options

High

4.7 kΩ external pull-up resistor 4.7 kΩ external pull-up resistor

Host GPIO output high1

Low

External pull-down resistor

Host GPIO output low1

Floating pin2

Table 11. Recommended Control for Hardware Configuration Pins

(Continued)

Required Pin

Level

Managed Configuration

Options

Unmanaged Configuration

Options

Host GPIO tristated2

Floating pin2

1 A low value series resistor is recommended.

2 An external pull-down resistor is recommended.

Software Power-Down After Reset

If the ADIN1111 is configured so that it does not enter software

power-down mode after reset, the ADIN1111 starts autonegotiation

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

tiation completes. If the ADIN1111 is configured so that it enters

software power-down mode after reset, the ADIN1111 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 12. Software Power-Down (Hardware Configuration)

Software Power-Down Configuration

SWPD_EN

PHY in software power-down after reset

PHY not in software power-down

Leader/Follower Preference

The MS_SEL hardware configuration pin is shared with the

TS_TIMER pin and configures the default leader/follower selection.

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

is configured by default to prefer follower (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 leader.

If autonegotiation is disabled, MS_SEL sets the default leader/fol-

lower selection. Autonegotiation is enabled by default for the

ADIN1111 and it is strongly recommended that autonegotiation is

always enabled.

During autonegotiation, when prefer follower is selected and the

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

follower (and remote to leader). When the remote end is prefer

or forced follower, the local PHY is set to leader (and remote to

follower).

Table 13. Leader/Follower Selection (Hardware Configuration)

Leader/Follower Selection

MS_SEL

Prefer Follower Selection

Prefer Leader Selection

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