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KSZ8765CLXCC View Datasheet(PDF) - Micrel

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KSZ8765CLXCC Datasheet PDF : 153 Pages
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Micrel, Inc.
KSZ8765CLX
cables are unplugged. If the cable is not plugged in, the device can automatically enter a low power statethe energy
detect mode. In this mode, the device will keep transmitting 120ns-wide pulses at a rate of 1 pulse per second. Once
activity resumes due to plugging in a cable or an attempt by the far end to establish a link, the device can automatically
power up to normal power state in energy detect mode.
Energy detect mode consists of the normal power state and low power state. While in low power state, the device reduces
power consumption by disabling all circuitry except the energy detect circuitry of the receiver. The energy detect mode is
entered by setting bits [4:3] = 01 in Register 14. When the KSZ8765CLX is in this mode, it will monitor the cable energy. If
there is no energy on the cable for a time longer than the pre-configured value at bits [7:0] go-sleep time in Register 15,
KSZ8765CLX will go into low power state. When KSZ8765CLX is in low power state, it will keep monitoring the cable
energy. Once the energy is detected from the cable, the device will enter normal power state. When the device is at
normal power state, it is able to transmit or receive packet from the cable.
Soft Power-Down Mode
The soft power-down mode is entered by setting bits [4:3] = 10 in Register 14. When KSZ8765CLX is in this mode, all PLL
clocks are disabled, also all of the PHYs and MACs are off. Any dummy host access will wake-up this device from current
soft power-down mode to normal operation mode and internal reset will be issued to make all internal registers go to the
default values.
Port-Based Power-Down Mode
In addition, the KSZ8765CLX features a per-port power-down mode. To save power, a PHY port that is not in use can be
powered down via the Port Control 10 Register bit [3] or MIIM PHY Register 0 bit [11].
Energy-Efficient Ethernet (EEE)
Along with supporting different power saving modes, the KSZ8765CLX extends its green functionality by supporting EEE
features defined in IEEE P802.3az, March 2010. Both 10Base-T and 100Base-TX EEE functions are supported in
KSZ8765CLX. In 100Base-TX, the EEE operation is asymmetric on the same link, which means one direction could be in
low power idle (LPI) state while another direction could handle packet transfer activity. Different from other types of power
saving modes, EEE is able to maintain the link while conserving power. Based on IEEE specification, the energy saving
from EEE is done at the PHY level. KSZ8765CLX reduces the power consumption not only at PHY level but also at MAC
and switch level by shutting down the unused clocks as much as possible when the device is in low power idle phase.
July 23, 2014
Figure 7. EEE Transmit and Receive Signaling Paths
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