ADIN1101BCPZ-R7 datasheet(20/79 Pages) AD

20 / 79 page

Data Sheet

ADIN1101

HARDWARE CONFIGURATION PINS

analog.com

Rev. A | 20 of 79

OVERVIEW

The ADIN1101 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 ADIN1101 reads the configuration pin level

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

and configures the PHY settings accordingly. When active, the

ADIN1101 immediately attempts to bring up a link 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 ADIN1101 operating

in standalone mode. This mode can be used when the system

requires a static configuration of the ADIN1101 without the need for

software control and an external host controller.

The managed configuration refers to the use of an external host

such as a microcontroller to control and manage the ADIN1101

by software over the MDIO interface. 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 ADIN1101 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 desired

operation of the ADIN1101 using hardware configuration pins with-

out any software intervention. The hardware configuration pins set

the default values of the corresponding management registers after

power-up, hardware reset, or software reset.

Software power-down after reset must be disabled for unmanaged

applications or the ADIN1101 remains in power-down indefinitely

because the device can only exit power-down from register oper-

ation using the management interface (see the Software Power-

Down Mode section).

MANAGED APPLICATIONS

In managed applications, the ADIN1101 can be configured by a

host controller via the management interface. 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 as the host controller brings the ADIN1101

to active mode using the management interface.

HARDWARE CONFIGURATION PINS

FUNCTIONS

Overview

The following functions are configurable from the ADIN1101 hard-

ware configuration pins:

►

PHY address

►

Software power-down mode after reset

►

Transmit amplitude configuration

►

Leader/follower selection

►

MAC interface selection (RMII/MII)

►

Media converter operation

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

tors. The default mode of operation is shown in Table 14. If an

alternative mode of operation is required, refer to Table 15 for the

suggested external pin control.

Table 14. Default Hardware Configuration Modes

Hardware Configuration Pin Function

Default Mode (Pin Floating)

PHY Address

0x0

Software Power-Down Mode After Reset

Enabled

Leader/Follower Selection

Prefer follower

Transmit Amplitude

Both 1.0 V p-p and 2.4 V p-p

MAC Interface Selection

RMII

Media Converter

Normal PHY operation

Table 15. 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 External pull-down resistor is recommended.

Media Converter

The ADIN1101 can operate as a media converter, which allows

a 10BASE-T PHY to be connected directly to the ADIN1101 via

the RMII or RGMII. The ADIN1101 can connect to a 10BASE-T1L

remote PHY via the MDI pins.

In RMII mode, the MEDIA_CNV hardware configuration strap pin

can be used to enable the media converter functionality by default

after reset or power cycle. Alternatively, the media converter can

be configured via the CRSM_RMII_MEDIA_CNV_EN bits (see the

MAC Interface Configuration Register section).

In RGMII mode, the ADIN1101 can be directly connected to another

RGMII device without any media configuration requirements.

The MEDIA_CNV hardware configuration pin signal is shared with

TXD_3, which is not used in RGMII mode (see the MAC Inter-

face section). The TXD_3/MEDIA_CNV pin has a weak internal

pull-down resistor. Thus, by default, the ADIN1101 is configured for

normal PHY operation (for example, external MAC chip connected

on the MAC interface). An external pull-up resistor or external host

ADIN1101BCPZ-R7 Folha de dados(PDF) 20 Page - Analog Devices

ADIN1101BCPZ-R7 Folha de dados(HTML) 20 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

Folha de dados Download

Ligação URL