KSZ8765CLXIC View Datasheet(PDF) - Micrel
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KSZ8765CLXIC Datasheet PDF : 153 Pages
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Micrel, Inc.
KSZ8765CLX
Figure 8. Traffic Activity and EEE LPI Operations
PHY LPI Receive Operation
On receive, entering the LPI mode is triggered by the reception of a sleep signal from the link partner, which indicates that
the link partner is about to enter the LPI mode. After sending the sleep signal, the link partner ceases transmission. When
the receiver detects the sleep signal, the local PHY indicates “Assert LPI” on the MII and the local receiver can disable
some functionality to reduce power consumption. The link partner periodically transmits refresh signals that are used by
the local PHY. This quiet-refresh cycle continues until the link partner initiates transition back to normal mode by
transmitting the wake signal for a predetermined period of time controlled by the LPI assert function. This allows the local
receiver to prepare for normal operation and transition from the “Assert LPI” encoding to the normal inter-frame encoding
on the MII. After a system-specified recovery time, the link supports the nominal operational data rate.
Negotiation with EEE Capability
The EEE capability is advertised during the auto-negotiation stage. Auto-negotiation provides a linked device with the
capability to detect the abilities supported by the device at the other end of the link, determine common abilities, and
configure for joint operation. Auto-negotiation is performed at power-up or reset, on command from management, due to
link failure, or due to user intervention.
During auto-negotiation, both link partners indicate their EEE capabilities. EEE is supported only if both the local device
and link partner advertise the EEE capability for the resolved PHY type during auto-negotiation. If EEE is not supported,
all EEE functionality is disabled and the LPI client does not assert LPI. If EEE is supported by both link partners for the
negotiated PHY type, then the EEE function can be used independently in either direction.
Wake-on-LAN (WoL)
Wake-on-LAN allows a computer to be turned on or woken up by a network message. The message is usually sent by a
program executed on another computer on the same local area network. Wake-up frame events are used to wake the
system whenever meaningful data is presented to the system over the network. Examples of meaningful data include the
reception of a Magic Packet™, a management request from a remote administrator, or simply network traffic directly
targeted to the local system. The KSZ8765CLX can be programmed to notify the host of the Wake-up frame detection
with the assertion of the interrupt signal (INTR_N) or assertion of the power management event (PME) signal. The PME
control is by PME indirect registers.
KSZ8765CLX MAC supports the detection of the following wake-up events:
Detection of an energy signal over a pre-configured value: Port PME Control Status Register bit [0] in PME indirect
registers.
Detection of a link-up in the network link state: Port PME Control Status Register bit [1] in the PME indirect registers.
Receipt of a Magic Packet: Port PME Control Status Register bit [2] in the PME indirect registers.
July 23, 2014
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Revision 1.0
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