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LAN9117 데이터시트(HTML) 22 Page - Microchip Technology

부품명 LAN9117
상세내용  High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
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LAN9117 데이터시트(HTML) 22 Page - Microchip Technology

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LAN9117
DS00002267A-page 22
 2005-2016 Microchip Technology Inc.
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.
3.5.1
MAGIC PACKET DETECTION
Setting the Magic Packet Enable bit (MPEN) in the “WUCSR—Wake-up Control and Status Register”, places the
LAN9117 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 LAN9117 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 LAN9117 will resume normal receive operation. Please refer to Section 5.4.12, "WUCSR—Wake-up Con-
trol and Status Register," on page 87 for additional information on this register.
In Magic Packet mode, the Power Management Logic constantly monitors each frame addressed to the node for a spe-
cific 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.
TABLE 3-3:
FILTER I BYTE MASK BIT DEFINITIONS
Filter i Byte Mask Description
Field
Description
31
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
3
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
0
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
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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