LAN9211 datasheet(27/147 Pages) SMSC

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High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support

Datasheet

SMSC LAN9211

Revision 2.9 (03-01-12)

DATASHEET

The Filter i CRC-16 register contains the CRC-16 result of the frame that should pass Filter i.

Table 3.6 describes the Filter i CRC-16 bit fields.

3.5.1

Magic Packet Detection

Setting the Magic Packet Enable bit (MPEN) in the “WUCSR—Wake-up Control and Status Register”,

places the LAN9211 MAC in the “Magic Packet” detection mode. In this mode, normal data reception

is disabled, and detection logic within the MAC examines receive data for a Magic Packet. The

LAN9211 can be programmed to notify the host of the “Magic Packet” detection with the assertion of

the host interrupt (IRQ) or assertion of the power management event signal (PME). Upon detection,

the Magic Packet Received bit (MPR) in the WUCSR is set. When the host clears the MPEN bit the

LAN9211 will resume normal receive operation. Please refer to Section 5.4.12, "WUCSR—Wake-up

Control and Status Register," on page 114 for additional information on this register

In Magic Packet mode, the Power Management Logic constantly monitors each frame addressed to

the node for a specific Magic Packet pattern. It checks only packets with the MAC’s address or a

broadcast address to meet the Magic Packet requirement. The Power Management Logic checks each

received frame for the pattern 48h FF_FF_FF_FF_FF_FF after the destination and source address

field.

Then the Function looks in the frame for 16 repetitions of the MAC address without any breaks or

interruptions. In case of a break in the 16 address repetitions, the PMT Function scans for the

48'hFF_FF_FF_FF_FF_FF pattern again in the incoming frame.

The 16 repetitions may be anywhere in the frame but must be preceded by the synchronization stream.

The device will also accept a multicast frame, as long as it detects the 16 duplications of the MAC

address. If the MAC address of a node is 00h 11h 22h 33h 44h 55h, then the MAC scans for the

following data sequence in an Ethernet: Frame.

Table 3.5 Filter i Offset Bit Definitions

FILTER I OFFSET DESCRIPTION

FIELD

DESCRIPTION

7:0

Pattern Offset: The offset of the first byte in the frame on which CRC is checked for wake-up frame

recognition. The minimum value of this field must be 12 since there should be no CRC check for

the destination address and the source address fields. The MAC checks the first offset byte of the

frame for CRC and checks to determine whether the frame is a wake-up frame. Offset 0 is the first

byte of the incoming frame's destination address.

Table 3.6 Filter i CRC-16 Bit Definitions

FILTER I CRC-16 DESCRIPTION

FIELD

DESCRIPTION

15:0

Pattern CRC-16: This field contains the 16-bit CRC value from the pattern and the byte mask

programmed to the wake-up filter register Function. This value is compared against the CRC

calculated on the incoming frame, and a match indicates the reception of a wakeup frame.

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