LAN9250 datasheet(149/421 Pages) MICROCHIP

149 / 421 page

 2015 Microchip Technology Inc.

DS00001913A-page 149

LAN9250

CRC[2] = F5 ^ F7

CRC[1] = F6

CRC[0] = F7

Table 11-7 indicates the cases that produce a wake when the Wake-Up Frame Enable (WUEN) bit of the Host MAC

Wake-up Control and Status Register (HMAC_WUCSR) is set. All other cases do not generate a wake.

Note 1:

As determined by bit 0 of Filter i Command.

Note 2:

CRC matches Filter i CRC-16 field.

Note 3:

As determined by bit 9 of WUCSR.

Note 4:

As determined by bits 3:2 of Filter i Command.

Note 5:

When wake-up frame detection is enabled via the Wake-Up Frame Enable (WUEN) bit of the Host MAC

Wake-up Control and Status Register (HMAC_WUCSR), a broadcast wake-up frame will wake-up the

device despite the state of the Disable Broadcast Frames (BCAST) bit in the Host MAC Control Register

(HMAC_CR).

Note:

x indicates “don’t care”.

TABLE 11-6:

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 pro-

grammed 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 11-7:

WAKEUP GENERATION CASES

Filter

Enabled

(Note 1)

Frame

Type

CRC

Match

(Note 2)

Global

Unicast

Enabled

(Note 3)

Pass

Regular

Receive

Filter

Address

Type

(Note 4)

Yes

Unicast

Yes

Unicast

Yes

Unicast

(=00)

Yes

Multicast

Yes

Multicast

(=10)

Yes

Broadcast

(Note 5)

Yes

xxx

YesxYesxYes

Passed

Receive

Filter

(=x1b)

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