WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 189

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

Specifications of WG82574L S LBA8

• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

System Manageability—82574 GbE Controller
Figure 40.
8.3
8.4
Sideband Interface
The sideband interface provides a mechanism by which the 82574 can be shared
between the host and the MC. By providing this sideband interface, the MC can
communicate with the LAN without requiring a dedicated Ethernet controller to do so.
The 82574 supports two sideband interfaces:
The usable bandwidth for either direction is up to 400 Kb/s when using the SMBus
interface and 100 Mb/s for the NC-SI interface.
Note that only one mode of sideband can be active at any given time. This
configuration is done via an NVM setting (see
Components of a Sideband Interface
There are two components to a sideband interface:
The MC and the 82574 must be in alignment for both of these components. For
example, the NC-SI physical interface is based on the RMII interface. However, there
are some differences at the physical level (detailed in the NC-SI specification) and the
protocol layer is completely different.
SMBus Pass-Through Interface
SMBus is the system management bus defined by Intel® Corporation in 1995. It is
used in personal computers and servers for low-speed system management
communications. The SMBus interface is one of two pass-through interfaces available in
the 82574.
• SMBus
• NC-SI
• Physical Layer - The electrical layer that transfers data
• Logical Layer - The agreed upon protocol that is used for communications
MC
Sideband
Interface
82574
Host
section 6.0
Interface
Host
Interface
LAN
Port 0
for more details).
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