WG82577LM S LGWS Intel, WG82577LM S LGWS Datasheet - Page 50

• Manufacturer Part Number: WG82577LM S LGWS
• Manufacturer: Intel

Specifications of WG82577LM S LGWS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

7.4.1.3.2
Note:
7.4.1.3.2.1
7.4.1.3.2.2
43
Flexible Filter
The 82577 supports a total of six flexible filters. Each filter can be configured to
recognize any arbitrary pattern within the first 128 bytes of the packet. To configure
the flexible filter, software programs the mask values into the Flexible Filter Mask Table
(FFMT) and the required values into the Flexible Filter Value Table (FFVT), and the
minimum packet length into the Flexible Filter Length Table (FFLT). These contain
separate values for each filter. Software must also enable the filter in the WUFC
register, and enable the overall wake up functionality must be enabled by setting
PME_En in the Power Management Control Status Register (PMCSR) or the WUC
register.
Once enabled, the flexible filters scan incoming packets for a match. If the filter
encounters any byte in the packet where the mask bit is one and the byte doesn’t
match the byte programmed in the Flexible Filter Value Table (FFVT) then the filter fails
that packet. If the filter reaches the required length without failing the packet, it passes
the packet and generates a wake up event. It ignores any mask bits set to one beyond
the required length.
The following packets are listed for reference purposes only. The flexible filter could be
used to filter these packets.
IPX Diagnostic Responder Request Packet
An IPX Diagnostic Responder Request packet must contain a valid MAC address, a
protocol type of 0x8137, and an IPX diagnostic socket of 0x0456. It might include LLC/
SNAP Headers and VLAN Tags. Since filtering this packet relies on the flexible filters,
which use offsets specified by the operating system directly, the operating system must
account for the extra offset LLC/SNAP Headers and VLAN tags.
Directed IPX Packet
A valid Directed IPX packet contain the station’s MAC address, a protocol type of
0x8137, and an IPX node address that equals to the station’s MAC address. It might
include LLC/SNAP Headers and VLAN Tags. Since filtering this packet relies on the
flexible filters, which use offsets specified by the operating system directly, the
operating system must account for the extra offset LLC/SNAP Headers and VLAN tags.
Offset
21
22
38
Offset
0
6
12
12
12
14
30
# of Bytes
1
16
16
# of
Bytes
6
6
4
8
2
16
2
Field
Destination Address
Source Address
Possible VLAN Tag
Possible Len/LLC/SNAP Header
Type
Some IPX Information
IPX Diagnostic Socket
Field
Hop Limit
Source IP Address
Destination IP Address
Value
-
-
IP6AT
Value
0x8137
-
0x0456
Ignore
Action
Ignore
Compare
82577 GbE PHY—Device Functionality
Action
Compare
Skip
Skip
Skip
Compare
Ignore
Compare
Comment
Match value in IP6AT
Comment
IPX