ADIN1300CCPZ-R7 datasheet(27/96 Pages) AD

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Data Sheet

ADIN1300

THEORY OF OPERATION

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Rev. B | 27 of 96

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 transition between lower power consumption and normal oper-

ation 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 25) or

by setting the EEE_1000_ADV or EEE_100_ADV bits (EEE_ADV

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, Reg-

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

See Table 57, Table 58, and Table 59.

Figure 26. LED_0 Hardware Configuration Pin Interaction

The LED_0 pin is also shared with pin configuration functions as

defined in Table 25, 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 26).

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 26. 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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