KSZ9563RNXC datasheet(51/226 Pages) MICROCHIP

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DS00002419D-page 51

KSZ9563R

4.8.5.1

Transmit Direction Control for MII Mode

For EEE ports, low-power idle (LPI) state for the transmit direction will be entered when the internal EEE MAC signals

to its PHY to do so. The PHY will stay in the transmit LPI state as long as indicated by the MAC. The TX_CLK is not

stopped.

Even though the PHY is in LPI state, it will periodically leave the LPI state to transmit a refresh signal using specific

transmit code bits. This allows the link partner to keep track of the long-term variation of channel characteristics and

clock drift between the two partners. Approximately every 20ms - 22ms, the PHY will transmit a bit pattern to its link

partner of duration 200µs - 220µs. The refresh times are shown in Figure 4-10.

4.8.5.2

Receive Direction Control for MII Mode

If enabled for LPI mode, upon receiving a P Code bit pattern (refresh), the PHY will enter the LPI state and signal to the

internal MAC. If the PHY receives some non-P Code bit pattern, it will signal to the MAC to return to “normal frame”

mode. The PHY can turn off the RX_CLK after nine or more clocks have occurred in the LPI state.

In the EEE-compliant environment, the internal PHYs will be monitoring and expecting the P Code (refresh) bit pattern

from its link partner that is generated approximately every 20ms - 22ms, with a duration of about 200µs - 220µs. This

allows the link partner to keep track of the long term variation of channel characteristics and clock drift between the two

partners.

4.8.6

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 awaken

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 device can be programmed to notify the host of the Wake-Up frame detection

with the assertion of the interrupt signal (INTRP_N) or assertion of the power management event signal (PME_N).

The device’s MACs support the detection of the following Wake-Up events:

• Detection of energy signal over a pre-configured value

• Detection of a linkup in the network link state

• Receipt of a Magic Packet

There are also other types of Wake-Up events that are not listed here as manufacturers may choose to implement these

in their own way.

4.8.6.1

Direction of Energy

The energy is detected from the cable and is continuously presented for a time longer than pre-configured value, espe-

cially when this energy change may impact the level at which the system should re-enter to the normal power state.

4.8.6.2

Direction of Link-up

Link status wake events are useful to indicate a linkup in the network's connectivity status.

4.8.6.3

Magic PacketTM

The Magic Packet is a broadcast frame containing anywhere within its payload 6 bytes of all 1s (FF FF FF FF FF FF)

followed by sixteen repetitions of the target computer's 48-bit DA MAC address. Since the magic packet is only scanned

for the above string, and not actually parsed by a full protocol stack, it may be sent as any network- and transport-layer

protocol.

Magic Packet technology is used to remotely wake up a sleeping or powered-off PC on a LAN. This is accomplished by

sending a specific packet of information, called a Magic Packet frame, to a node on the network. When a PC capable

of receiving the specific frame goes to sleep, it enables the Magic Packet RX mode in the LAN controller, and when the

LAN controller receives a Magic Packet frame, it will alert the system to wake up. Once the device has been enabled

for Magic Packet Detection, it scans all incoming frames addressed to the node for a specific data sequence, which

indicates to the controller this is a Magic Packet frame.

A Magic Packet frame must also meet the basic requirements for the LAN technology chosen, such as Source Address

(SA), Destination Address (DA), which may be the receiving station's IEEE MAC address, or a multicast or broadcast

address and CRC. The specific sequence consists of 16 duplications of the MAC address of this node, with no breaks

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