WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 51

• 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

Interconnects—82574 GbE Controller
3.2.6.4
Note:
Note:
3.3
3.3.1
3.3.2
Software Initiated Pause Frame Transmission
The 82574 has the added capability to transmit an XOFF frame via software. This is
accomplished by software writing a 1b to the SWXOFF bit of the Transmit Control
register. Once this bit is set, hardware initiates transmitting a pause frame in a manner
similar to that automatically generated by hardware.
The SWXOFF bit is self-clearing after the pause frame has been transmitted.
The state of the CTRL.TFCE bit or the negotiated flow control configuration does not
affect software generated pause frame transmission.
Software sends an XON frame by programming a zero in the Pause Timer field of the
FCTTV register.
XOFF transmission is not supported in 802.3x for half-duplex links. Software should not
initiate an XOFF or XON transmission if the 82574 is configured for half-duplex
operation.
SPI Non-Volatile Memory Interface
General Overview
The 82574 requires non-volatile content for the 82574 configuration. The Non-Volatile
Memory (NVM) might contain the following main regions:
Supported NVM Devices
Previous GbE controllers required both EEPROM and Flash to store data. The 82574
reduces Bill Of Material (BOM) cost by consolidating the Flash and EEPROM into a single
NVM. The NVM is connected to a single SPI interface.
EEPROM: The 82574 is compatible with many sizes of 4-wire SPI EEPROM devices. The
recommended EEPROMs for The 82574 are:
Typically, the EEPROM size should be 32 Kb for supporting manageability, SMBus pass
through, and Network Controller-Sideband Interface (NC-SI) over RMII. At 1 Kb or 2 Kb
EEPROM sizes, manageability is not supported.
• LAN configuration space accessed by hardware - loaded by the 82574 after power
• LAN configuration space accessed by software - used by software only. The
• 1 Kb: STM* 95010W6, Catalyst* CAT25010S, or Atmel* AT25010N
• 2 Kb: STM 95020W6, Catalyst CAT25020S, or Atmel AT25020N
• 32 Kb: STM 95320W6, Catalyst CAT25C320S, or Atmel AT25320N
up, PCI reset de-assertion, D3->D0 transition, or a software commanded EEPROM
read (CTRL_EXT.EE_RST).
meaning of these registers as listed here as a convention for the software only and
is ignored by the 82574.
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