ADIN1300BCPZ-R7 datasheet(23/79 Pages) AD

23 / 79 page

Data Sheet

ADIN1300

Rev. 0 | Page 23 of 79

Typically, the PHY enters energy detect power-down mode

when the cable is unplugged and exits this mode when a cable is

plugged in and a remote link partner appears. In this mode, the

PHY periodically wakes up and transmits a link pulse on the

MDI_0 and MDI_1 pins to ensure that a lock out is avoided

where both local and remote PHY are in an energy detect

power-down mode.

EEE, Low Power Idle Mode

The ADIN1300 supports EEE and is compliant with the IEEE

802.3 standard. EEE can be used to reduce power consumption

when no data is being transmitted by either the local or remote

end. Both devices must have EEE enabled and advertised. If EEE

is advertised by the local and remote PHYs, an EEE link is

brought up. If there is no data to be sent, the MAC requests the

ADIN1300 to enter EEE low power idle mode. When the MAC

or remote PHY wishes to send data, the ADIN1300 PHY wakes

up (within 16 µs for 1000BASE-T and 20 µs for 100BASE-TX)

and can send or receive data.

The transitions between lower power consumption and normal

operation is handled such that all frames remain intact and

transmitted as normal, and the upper layer protocols are unaware

of any changes at the PHY level. When data is transmitted, it

continues to transmit at the fastest link speed established. See

the Typical Power Consumption section for more details on the

power savings in this mode.

EEE mode can be enabled using the appropriate pull-up/pull-

down resistors on the LINK_ST pin and LED_0 pin (see Table 23)

or by setting the EEE_1000_ADV or EEE_100_ADV bits (EEE_

ADV register, Address 0x8001) to 1. During link autonegotiation,

the local and remote PHYs advertise the speeds supported,

including if they are EEE capable and, the PHYs then attempt to

bring up a link at the highest speed supported by both sides. If

EEE is advertised by both the local and remote PHYs for the

established link speed, the link is an EEE link. If there is an EEE

link and if at some point in time there is no data to be sent, the

MAC requests the ADIN1300 to enter EEE LPI mode, which is

almost as low power as energy detect power-down mode. The

ADIN1300 wakes up periodically to transmit refresh signals

that are used by the link partner to update adaptive filters and

timing circuits to maintain link integrity.

The following events occur when in EEE LPI mode:

•

All analog and digital circuits are in a low power mode.

•

Most internal clocks are gated off.

•

The output reference clock (if enabled) is available on the

CLK25_REF pin.

•

The selected PHY output clock (if enabled) is available on

the GP_CLK pin.

•

The management interface registers are accessible.

•

The PHY monitors the line for an LPI wake signal.

When the local or remote PHY wishes to send data, the PHY

initiates an LPI wake sequence and the PHYs can then start to

send or receive data within 16 µs for 1000BASE-T (20 µs for

100BASE-TX).

STATUS LED

The ADIN1300 provides a configurable status LED. The LED

can be used to indicate the speed of operation, link status, and

duplex mode. The LED pin can be configured to be active high

or active low. The recommendation is to use the LED as active

low. The ADIN1300 automatically senses the connection of the

LED during power up and reset. For example, if it senses that

the pin is pulled to a supply, it configures the LED for active low

operation. By default, LED_0 illuminates when a link is

established and blinks when there is activity. The default LED

operation can be overwritten in software using the PHY LED

control registers, LED_CTRL_1, LED_CTRL_2, and

LED_CTRL_3 (Register Address 0x001B, Register Address

0x001C, and Register Address 0x001D, respectively). See

Table 54, Table 55, and Table 56.

R_HI

R_LO

LED PIN

GND

3.3V

MODE_3/MODE_4

R_HI

R_LO

LED PIN

GND

3.3V

MODE_1/MODE_2

Figure 25. LED_0 Hardware Configuration Pin Interaction

The LED_0 pin is also shared with pin configuration functions

as defined in Table 23, and it can be necessary for the voltage

level on the pin to be at a certain value on power-on and reset to

configure the ADIN1300 as required (set by a pull-up resistor

from the pin to the supply (R_HI) and a pull-down resistor

from the pin to GND (R_LO) in Figure 25).

The default operation of the LED is active low. So, if the default

configuration setting is MODE_4, an external LED circuit using

an active low LED results in a Logic 1 being read at the pin, and

so the LED behaves as expected. For example, the LED does not

turn on at power-on and reset.

An active low LED circuit is functional for a configuration

setting of MODE_3 where the sense voltage is such that an

active low LED is still off during power-on and reset, because

there is insufficient forward voltage.

For configuration settings of MODE_1 or MODE_2, an

external transistor must drive the LED as an active high LED, as

shown in Figure 25. It is also be possible to drive an active high

LED directly from the pin. However, this necessitates the use of

an LED with a low forward voltage and, depending on the LED

chosen, the LED may be quite dim.

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