LAN9500AI datasheet(62/213 Pages) MICROCHIP

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LAN950x

DS00001875A-page 62

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The Filter i Offset register defines the offset in the frame’s destination address field from which the frames are examined

by Filter i. Table 5-51 describes the Filter i Offset bit fields.

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

Table 5-52 describes the Filter i CRC-16 bit fields.

Table 5-53 indicates the cases that produce a wake when the Wakeup Frame Enable (WUEN) bit of the Wakeup Control

and Status Register (WUCSR) is set. All other cases do not generate a wake.

Note 5-21

As determined by bit 0 of Filter i Command.

Note 5-22

CRC matches Filter i CRC-16 field.

Note 5-23

As determined by bit 9 of WUCSR.

TABLE 5-50:

FILTER I COMMAND BIT DEFINITIONS

FILTER i COMMANDS

Bits

Description

3:2

Address Type: Defines the destination address type of the pattern.

00 = Pattern applies only to unicast frames.

10 = Pattern applies only to multicast frames.

X1 = Pattern applies to all frames that have passed the regular receive filter.

RESERVED

Enable Filter: When bit is set, Filter i is enabled, otherwise, Filter i is disabled.

TABLE 5-51:

FILTER I OFFSET BIT DEFINITIONS

FILTER I OFFSET DESCRIPTION

Bits

Description

7:0

Pattern Offset: The offset of the first byte in the frame on which CRC is checked for Wakeup Frame

recognition. The MAC checks the first offset byte of the frame for CRC and checks to determine

whether the frame is a Wakeup Frame. Offset 0 is the first byte of the incoming frame's destination

address.

TABLE 5-52:

FILTER I CRC-16 BIT DEFINITIONS

FILTER I CRC-16 DESCRIPTION

Bits

Description

15:0

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

programmed to the Wakeup 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.

TABLE 5-53:

WAKEUP GENERATION CASES

Filter

Enabled

(Note 5-21)

CRC Match

(Note 5-22)

Global

Unicast

Enabled

(Note 5-23)

Pass

Regular

Receive

Filter

Address

Type

(Note 5-24)

Broad-cast

Frame

(Note 5-25)

Multi-cast

Frame

Unicast

Frame

Yes

Multicast

(=10)

Yes

Unicast

(=00)

Yes

YesxYes

Passed

Receive

Filter

(=x1b)

xxx

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