ADIN2111CCPZ-R7 datasheet(21/125 Pages) AD

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Data Sheet

ADIN2111

HARDWARE CONFIGURATION PINS

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Rev. 0 | 21 of 125

The ADIN2111 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 ADIN2111 reads the configuration pin level

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

and configures the two PHY settings accordingly. When active,

the ADIN2111 immediately attempts to bring up a link on each

PHY, and the hardware configuration pins can then be used with

their main pin function. These pins can be used in unmanaged or

managed configuration.

The unmanaged configuration refers to the ADIN2111 PHY param-

eters being configured by the hardware configuration pins. This

mode can be used when the system requires a static configuration

of the ADIN2111 port settings without the need for software control.

In this context, the port to port operation on the ADIN2111 is

configured in cut through.

The managed configuration refers to the full control of the

ADIN2111 using software via the SPI. The two PHYs, MAC layer,

and the store and forward switch 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 ADIN2111 hardware

configurations set by the hardware pins after power-up, hardware

reset, or software reset.

UNMANAGED APPLICATIONS

In unmanaged applications, it is possible to configure the ADIN2111

using the hardware configuration pins without any software inter-

vention. In that case, the ADIN2111 is configured by default in cut

through mode (port to port forwarding).

Software power-down after reset must be disabled on both port

PHYs for unmanaged applications, or the ADIN2111 associated

PHY remains in power-down indefinitely, because the device can

only exit power-down from register operation using the SPI (see the

Software Power-Down Mode section).

MANAGED APPLICATIONS

In managed applications, the ADIN2111 can be configured by a

host controller via the SPI. The host controller can dynamically

configure the device as required by the application.

In managed applications, the software power-down after reset func-

tionality can be enabled because the host controller brings the

ADIN2111 to active mode using the management interface.

HARDWARE CONFIGURATION PIN

FUNCTIONS

The following functions are configurable from the ADIN2111 hard-

ware configuration pins:

►

PHY 1 software power-down mode after reset

►

PHY 2 software power-down mode after reset

►

PHY 1 transmit amplitude configuration

►

PHY 2 transmit amplitude configuration

►

OPEN Alliance or generic SPI

►

SPI CRC/protection

All of the hardware configuration pins have internal pull-up or

pull-down resistors, as shown in Table 8. The default mode of

operation is shown in Table 16. If an alternative mode of operation

is required, refer to Table 17 for the suggested external pin control.

Table 16. Default Hardware Configuration Modes

Hardware Configuration Pin Function

Default Mode (Pin Floating)

Port 1 Software Power-Down Mode

After Reset

Enabled

Port 2 Software Power-Down Mode

After Reset

Disabled

Port 1 Transmit Amplitude

1.0 V p-p and 2.4 V p-p

Port 2 Transmit Amplitude

1.0 V p-p and 2.4 V p-p

SPI Protocol

OPEN Alliance

SPI CRC/Protection

Enabled

Table 17. 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

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

The P1_SWPD_EN (respectively P2_SWPD_EN) hardware config-

uration pin signal is used to enable or disable the software pow-

er-down after reset feature for PHY 1 (respectively PHY 2). The

power-down bit (CRSM_SFT_PD) in the software power-down con-

trol register is set based on the Px_SWPD_EN signal status during

power-up, hardware reset, or software reset. CRSM_SFT_PD can

also be set using the SPI via the MDIO bridge to enable software

power-down after reset.

The P1_SWPD_EN pin has a weak internal pull-down resistor.

Therefore, by default, the ADIN2111 Port 1 is configured with

software power-down after reset enabled.

The P2_SWPD_EN pin has a weak internal pull-up resistor. There-

fore, by default, the ADIN2111 Port 2 is configured with software

power-down after reset disabled.

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