Functional Description
122 Datasheet
5.2.4.4 SMI/SCI Generation
Interrupts for Hot-Plug events are not supported on legacy operating systems. To
support Hot-Plug on n on-PCI Express aware operating systems, Hot-Plug events can
be routed to generate SCI. To generate SCI, MPC.HPCE (D28:F0/F1/F2/F3/F4/F5/F6/
F7:Offset D8h:Bit 30) must be set. When set, enabled Hot-Plug events will cause
SMSCS.HPCS (D28:F0/F1/F2/F3/F4/F5/F6/F7:Offset DCh:Bit 30) to be set.
Additionally, BIOS workarounds for Hot-Plug can be supported by setting MPC.HPME
(D28:F0/F1/F2/F3/F4/F5/F6/F7:Offset D8h:Bit 1). When this bit is set, Hot-Plug events
can cause SMI status bits in SMSCS to be set. Supported Hot-Plug events and their
corresponding SMSCS bit are:
• Command Completed – SCSCS.HPCCM (D28:F0/F1/F2/F3/F4/F5/F6/F7:Offset
DCh:Bit 3)
• Presence Detect Changed – SMSCS.HPPDM (D28:F0/F1/F2/F3/F4/F5/F6/F7:Offset
DCh:Bit 1)
• Attention Button Pressed – SMSCS.HPABM (D28:F0/F1/F2/F3/F4/F5/F6/F7:Offset
DCh:Bit 2)
• Link Active State Changed – SMSCS.HPLAS (D28:F0/F1/F2/F3/F4/F5/F6/F7:Offset
DCh:Bit 4)
When any of these bits are set, SMI# will be generated. These bits are set regardless of
whether interrupts or SCI is enabled for Hot-Plug events. The SMI# may occur
concurrently with an interrupt or SCI.
5.3 Gigabit Ethernet Controller (B0:D25:F0)
The PCH integrates a Gigabit Ethernet (GbE) controller. The integrated GbE controller is
compatible with the Intel
®
82579 Platform LAN Connect device. The integrated GbE
controller provides two interfaces for 10/100/1000 Mb/s and manageability operation:
• Based on PCI Express – A high-speed SerDes interface using PCI Express electrical
signaling at half speed while keeping the custom logical protocol for active state
operation mode.
• System Management Bus (SMBus) – A very low speed connection for low power
state mode for manageability communication only. At this low power state mode
the Ethernet link speed is reduced to 10 Mb/s.
The 82579 can be connected to any available PCI Express port in the PCH. The 82579
only runs at a speed of 1250 Mb/s, which is 1/2 of the 2.5 Gb/s PCI Express frequency.
Each of the PCI Express root ports in the PCH have the ability to run at the 1250 Mb/s
rate. There is no need to implement a mechanism to detect that the 82579 LAN device
is connected. The port configuration (if any), attached to the 82579 LAN device, is pre-
loaded from the NVM. The selected port adjusts the transmitter to run at the
1250 Mb/s rate and does not need to be PCI Express compliant.
Note: PCIe validation tools cannot be used for electrical validation of this interface; however,
PCIe layout rules apply for on-board routing.
The integrated GbE controller operates at full-duplex at all supported speeds or half-
duplex at 10/100 Mb/s. It also adheres to the IEEE 802.3x Flow Control Specification.
Note: GbE operation (1000 Mb/s) is only supported in S0 mode. In Sx modes, SMBus is the
only active bus and is used to support manageability/remote wake-up functionality.
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