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Flow Control Type - FCT (00030h; R/W) — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 329
14.3.15 Flow Control Type - FCT (00030h; R/W)
This register contains the type field that hardware matches to recognize a flow control packet. Only the
lower 16 bits of this register have meaning. This register should be programmed with 88_08h. The
upper byte is first on the wire FCT[15:8].
14.3.16 Flow Control Transmit Timer Value - FCTTV
(00170h; R/W)
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, usually 4 bytes. If
software needs to send an XON frame, it must set TTV to 0b prior to initiating the PAUSE frame.
Note: The 82575 uses a fixed slot time of 64 byte times.
14.3.17 LED Control - LEDCTL (00E00h; RW)
Field Bit(s)
Initial
Value
Description
FCT 15:0 X Flow Control Type
Should be programmed with 88_08h.
Reserved 31:16 0b Reserved
Reads as 0b.
Field Bit(s)
Initial
Value
Description
TTV 15:0 X Transmit Timer Value
These bits are included in the XOFF frame.
Reserved 31:16 0b Reserved
Reads as 0b.
Should be written to 0b for future compatibility.
Field Bit
Initial
Value
Description
LED0_MODE 3:0 0010b
1
LED0/LINK# Mode
This field specifies the control source for the LED0 output. An initial value of
0010b selects LINK_UP# indication.
Reserved 4 0b Reserved
GLOBAL_
BLINK_MODE
50b
1
Global Blink Mode
This field specifies the blink mode of all the LEDs.
0b = Blink at 200 ms on and 200 ms off.
1b = Blink at 83 ms on and 83 ms off.
LED0_IVRT 6 0b
1
LED0/LINK# Invert
This field specifies the polarity/ inversion of the LED source prior to output or blink
control.
0b = Do not invert LED source.
1b = Invert LED source.