82583V Datasheet, PDF (209/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Driver Programing Interface—82583V GbE Controller
9.2.2.10 Flow Control Type - FCT (0x00030; RW)
Note:
9.2.2.11
Field
FCT
Reserved
Bit(s)
15:0
31:16
Initial
Value
X
0x0
Flow Control Type
Reserved
Reads as 0x0
Description
This register contains the type field hardware uses to recognize a flow control packet.
Only the lower 16 bits of this register have meaning. This register should be
programmed with 0x88_08. The upper byte is first on the wire FCT[15:8].
At the time of the original implementation, the flow control type field was not defined
and thus hardware provided programmability. Since then, the final release of the
802.3x standard has specified the type/length value for MAC control frames as 88-08.
VLAN Ether Type - VET (0x00038; RW)
9.2.2.12
Field
VET
Reserved
Bit(s)
15:0
31:16
Initial
Value
0x8100
0x0
VLAN Ether Type
Reserved
Reads as 0x0.
Description
This register contains the type field hardware uses to recognize an 802.1Q (VLAN)
Ethernet packet. To be compliant with the 802.3ac standard, this register should be
programmed with the value 0x8100. For VLAN transmission the upper byte is first on
the wire (VET[15:8]).
Flow Control Transmit Timer Value - FCTTV (0x00170; RW)
Note:
Field
TTV
Reserved
Bit(s)
15:0
31:16
Initial
Value
X
0x0
Description
Transmit Timer Value
Included in XOFF frame.
Reads as 0x0.
Should be written to 0x0 for future compatibility.
The 16-bit value in the TTV field is inserted into a transmitted frame (either XOFF
frames or any pause frame value in any software transmitted packets). It counts in
units of slot time. If software needs to send an XON frame, it must set TTV to 0b prior
to initiating the pause frame.
The 82583V uses a fixed slot time value of 64-byte times.
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