WG82574IT S LBAC Intel, WG82574IT S LBAC Datasheet - Page 199

• Manufacturer Part Number: WG82574IT S LBAC
• Description: CONTROLLER, ENET, INTEL 82574IT, 64PQFN
• Manufacturer: Intel

Specifications of WG82574IT S LBAC

• Ethernet Type: IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: QFN
• No. Of Pins: 64
• Package / Case: QFN
• Interface Type: I2C, JTAG, PCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

System Manageability—82574 GbE Controller
Figure 44.
8.3
8.4
Sideband Interface
The sideband interface provides a mechanism by which the 82574L 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 82574L 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 82574L 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 82574L.
• 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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