WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 294

• 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

10.2.2.8
Note:
10.2.2.9
Note:
294
Flow Control Address Low - FCAL (0x00028; RW)
Flow control packets are defined by 802.3X to be either a unique multicast address or
the station address with the EtherType field indicating pause. Hardware compares
incoming packets against the FCA register value to determine if it should pause its
output.
This register contains the lower bits of the internal 48-bit flow control Ethernet address.
All 32 bits are valid. Software can access the High and Low registers as a register pair if
it can perform a 64-bit access to the PCIe bus. This register should be programmed
with 0x00_C2_80_01. The complete flow control multicast address is:
0x01_80_C2_00_00_01; where 01 is the first byte on the wire, 80 is the second, etc.
Any packet matching the contents of {FCAH, FCAL, FCT} when CTRL.RFCE is set is
acted on by the 82574. Whether flow control packets are passed to the host (software)
depends on the state of the RCTL.DPF bit and whether the packet matches any of the
normal filters.
Flow Control Address High - FCAH (0x0002C; RW)
This register contains the upper bits of the 48-bit flow control Ethernet address. Only
the lower 16 bits of this register have meaning. The complete flow control address is
{FCAH, FCAL}. This register should be programmed with 0x01_00. The complete flow
control multicast address is: 0x01_80_C2_00_00_01; where 01 is the first byte on the
wire, 80 is the second, etc.
At the time of the original implementation, the flow control multicast address was not
defined and thus hardware provided programmability. Since then, the final release of
the 802.3x standard has reserved the following multicast address for MAC control
frames: 0x01-80-C2-00-00-01.
FCAL
FCAH
Reserved
Field
Field
31:0
15:0
31:16
Bit(s)
Bit(s)
X
X
0x0
Initial
Initial
Value
Value
Flow Control Address Low
Flow Control Address High
Reserved
Reads as 0x0.
82574 GbE Controller—Driver Programing Interface
Description
Description