Справочник Пользователя для Intel i7-3920XM Extreme AW8063801009607

Datasheet, Volume 2

237

Processor Configuration Registers 

9:7

RWS-V

000b

Powergood

Transmit Margin (txmargin)
This field controls the value of the non-deemphasized voltage 

level at the Transmitter pins. This field is reset to 000b on 

entry to the LTSSM Polling.Configuration substate (see PCIe 

Specification, Chapter 4 for details of how the transmitter 

voltage level is determined in various states). 
000 = 

Normal operating range 

001 = 

800–1200 mV for full swing and 400–700 mV 

for half-swing

010 – (n-1) =  Values must be monotonic with a non-zero 

slope. The value of n must be greater than 3 

and less than 7. 

At least two of these must be below the 

normal operating range

n = 

 200–400 mV for full-swing and 100–200 mV 

for half-swing

n–111 = 

Reserved

Reset Value is 000b. 
Components that support only the 2.5 GT/s speed are 

permitted to hardwire this bit to 0b. 
When operating in 5 GT/s mode with full swing, the de-

emphasis ratio must be maintained within ±1 dB from the 

specification defined operational value (either -3.5 or -6 dB). 
The processor supports the following values:
000 =  Normal operation (Reset Value); coefficients (cursor, 

precursor, postcursor) are at defined values

001 =  Coefficients are divided by 2
010 =  Coefficients are divided by 4
011 =  Coefficients are divided by 8 
All other codes are reserved.
The coefficients translate to 4 "level" values that are sent to 

the AFE. Note that Tx margining has no effect on the levels if 

"bypass levels" are enabled.

6

RWS

0b

Powergood

Selectable De-emphasis (selectabledeemphasis)
When the Link is operating at 5 GT/s speed, selects the level of 

de-emphasis. Encodings: 
1b = -3.5 dB
0b = -6 dB 
When the Link is operating at 2.5 GT/s speed, the setting of 

this bit has no effect. Components that support only the 

2.5 GT/s speed are permitted to hardwire this bit to 0b.
NOTE: For DMI this bit has no effect in functional mode as DMI 

is half-swing and will use -3.5 dB whenever de-emphasis is 

enabled.