82583V Datasheet, PDF (186/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

82583V GbE Controller—Power Management and Delivery
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8.5.3.2
8.5.3.2.1
Flexible Filter
The 82583V supports four flexible filters for host wake up and two flexible filters for
TCO wake up. For more details refer to Section 9.2.8.2. 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)
• The required values into the Flexible Filter Value Table (FFVT)
• 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.
• Enable the overall wake-up functionality by setting PME_En in the PMCSR or WUC.
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 FFVT, then the filter failed 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 may 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.
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186