82583V Datasheet, PDF (181/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Power Management and Delivery—82583V GbE Controller
8.5.2
8.5.3
PCIe Power Management Wake Up
The 82583V supports PCIe power management based wake ups. It can generate
system wake-up events from three sources:
• Reception of a Magic Packet*.
• Reception of a network wake-up packet.
• Detection of a link change of state.
Activating PCIe power management wake up requires the following steps:
• The software device driver programs the WUFC to indicate the packets it needs to
use to indicate wake up and supplies the necessary data to the Ipv4/v6 Address
Table (IP4AT, IP6AT) and the Flexible Filter Mask Table (FFMT), Flexible Filter
Length Table (FFLT), and the Flexible Filter Value Table (FFVT). It can also set the
Link Status Change Wake Up Enable (LNKC) bit in the WUFC to cause a wake up
when the link changes state.
• The operating system (at configuration time) writes a 1b to the PME_EN bit of the
PMCSR (bit 8).
Normally, after enabling wake up, the operating system writes a 11b to the lower two
bits of the PMCSR to put the 82583V into a low-power mode.
Once wake up is enabled, the 82583V monitors incoming packets, first filtering them
according to its standard address filtering method, then filtering them with all of the
enabled wake-up filters. If a packet passes both the standard address filtering and at
least one of the enabled wake-up filters, the 82583V:
• Sets the PME_Status bit in the PMCSR.
• If the PME_En bit in the PMCSR is set, asserts PE_WAKE_N.
• Stores the first 128 bytes of the packet in the WPM.
• Sets one or more of the Received bits in the WUS. (the 82583V set more than one
bit if a packet matches more than one filter.)
If enabled, a link state change wake up causes similar results, setting PME_Status,
asserting PE_WAKE_N and setting the Link Status Changed (LNKC) bit in the WUS
when the link goes up or down.
PE_WAKE_N remains asserted until the operating system either writes a b1 to the
PME_Status bit of the PMCSR or writes a 0b to the PME_EN bit.
After receiving a wake-up packet, the 82583V ignores any subsequent wake-up packets
until the software device driver clears all of the Received bits in the WUS. It also
ignores link change events until the software device driver clears the Link Status
Changed (LNKC) bit in the WUS.
Wake-Up Packets
The 82583V supports various wake-up packets using two types of filters:
• Pre-defined filters
• Flexible filters
Each of these filters are enabled if the corresponding bit in the WUFC is set to 1b.
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