LAN89218 datasheet(23/148 Pages) MICROCHIP

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DS60001255B-page 23

LAN89218

Table 3-3 describes the byte mask’s bit fields.

The Filter i command register controls Filter i operation.

Table 3-4 shows the Filter i command register.

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 3-5 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 3-6 describes the Filter i CRC-16 bit fields.

TABLE 3-3:

FILTER i BYTE MASK BIT DEFINITIONS

Filter i Byte Mask Description

Field

Description

Must be zero (0)

30:0

Byte Mask: If bit j of the byte mask is set, the CRC machine processes byte number

pattern - (offset + j) of the incoming frame. Otherwise, byte pattern - (offset + j) is ignored.

TABLE 3-4:

FILTER i COMMAND BIT DEFINITIONS

Filter i Commands

Field

Description

Address Type: Defines the destination address type of the pattern. When bit is set, the pattern applies

only to multicast frames. When bit is cleared, the pattern applies only to unicast frames.

2:1

Reserved

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

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 pro-

grammed 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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