LAN89730 datasheet(68/218 Pages) MICROCHIP

68 / 218 page

LAN89730

DS60001348A-page 68

 2013-2015 Microchip Technology Inc.

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

Table 4-51 describes the Filter i CRC-16 bit fields.

Table 4-52 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 4-20

As determined by bit 0 of Filter i Command.

Note 4-21

CRC matches Filter i CRC-16 field.

Note 4-22

As determined by bit 9 of WUCSR.

Note 4-23

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

Note 4-24

When Wakeup frame detection is enabled via the Wakeup Frame Enable (WUEN) bit of the Wakeup

Control and Status Register (WUCSR), a Broadcast Wakeup frame will wake up the device despite the

state of the Disable Broadcast Frames (BCAST) bit in the MAC Control Register (MAC_CR).

TABLE 4-51:

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 4-52:

WAKEUP GENERATION CASES

Filter

Enabled

(Note 4-20)

CRC

Match

(Note 4-21)

Global

Unicast

Enabled

(Note 4-22)

Pass

Regular

Receive

Filter

Address

Type

(Note 4-23)

Broad-

cast

Frame

(Note 4-24)

Multicast

Frame

Unicast

Frame

Yes

Multicast

(=10)

Yes

Unicast

(=00)

Yes

YesxYes

Passed

Receive

Filter

(=x1b)

xxx

Note:

x indicates “don’t care”.

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