IP175G datasheet(16/69 Pages) ETC2

16 / 69 page

IP175G/GI/GH/GHI

Data Sheet

16 / 69

November 27, 2012

IP175Gx-DS-R01.3

4.3

Green Power

IP175G/GH provides various power management modes to save the power consumption. In

addition to the power down mode defined on IEEE802.3, two extra power saving modes are used to

further reduce the system power consumption.

4.3.1 Auto Power Saving Mode

IP175G/GH will automatically enter this mode if no cable link is established. After entering this

mode, IP175G/GH will shutdown unnecessary function and issue the link pulse at a rate lower than the

regular rate specified on IEEE 802.3.

4.3.2 IEEE802.3az EEE (Energy Efficient Ethernet)

In order to enter this mode, the PHY part should declare the EEE capability during the

auto-negotiation phase.

It’s the higher layer’s responsibility to memorize the link partner’s wakeup time and wakeup the link

partner before sending data. The higher layer means a mechanism that can evaluate the packet buffer

utilization and wake the link partner before sending the data. In general speaking, this mechanism

probably consists of at least one of the following items: the packet buffer manager, the application

program and OS.

The EEE module works well at LPI (Low Power Idle) mode when

1. Link at full-duplex and

2. Auto-negotiation is enabled in both local and remote PHYs and

3. 100Mbps full duplex and

4. EEE ability is supported in both local & remote PHYs and

5. EEE_EN (Reg 22.0[7:0]) is enabled for EEE function via default value and

6. SLEEP_TIMER (Reg 22.1[11:0]) is the default value for EEE sleep timer and

7. WAKE_TIME (Reg 22.2~9) is the default value for EEE wake time.

4.3.3 WOL+ (Wake On LAN Plus)

IP175G/GH not only consumes low power, but also provides various energy-saving methods to

save the power. These combined methods make IP175G/GH a “green” PHY. The following pictures show

the method.

Packet wakes it up

No-Traffic leads it to sleep

IP175G

IP175G датащи(PDF) 16 Page - List of Unclassifed Manufacturers