Intel Core 2 Extreme QX6850 BX80569QX6850 User Manual

34

1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.

V

L

Input Low Voltage

-0.150

0.000

N/A

V

-

V

H

Input High Voltage

0.660

0.700

0.850

V

-

V

CROSS(abs)

Absolute Crossing 
Point

0.250

N/A

0.550

V

, 

2, 3

2. Crossing voltage is defined as the instantaneous voltage value when the rising edge of BCLK0 equals the 

falling edge of BCLK1. 

3. The crossing point must meet the absolute and relative crossing point specifications simultaneously.

V

CROSS(rel)

Relative Crossing 
Point

0.250 + 

0.5(V

Havg

 – 0.700)

N/A

0.550 + 

0.5(V

Havg

 – 0.700)

V

, 

4, 

, 5

4. V

Havg

 is the statistical average of the V

H

 measured by the oscilloscope.

5. V

Havg

 can be measured directly using “Vtop” on Agilent* oscilloscopes and “High” on Tektronix* oscilloscopes.

 ΔV

CROSS

Range of Crossing 
Points

N/A

N/A

0.140

V

, 

-

V

OS

Overshoot

N/A

N/A

V

H 

+ 0.3

V

6

6. Overshoot is defined as the absolute value of the maximum voltage. 

V

US

Undershoot

-0.300 N/A

N/A

V

7

7. Undershoot is defined as the absolute value of the minimum voltage.

V

RBM

Ringback Margin

0.200

N/A

N/A

V

8

8. Ringback Margin is defined as the absolute voltage difference between the maximum Rising Edge Ringback 

and the maximum Falling Edge Ringback.

V

TM

Threshold Region

V

CROSS

 – 0.100

N/A

V

CROSS

 + 0.100

V

9

9. Threshold Region is defined as a region entered around the crossing point voltage in which the differential 

receiver switches. It includes input threshold hysteresis.

660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850

200

250

300

350

400

450

500

550

600

650

550 mV

250 mV

250 + 0.5 (VHavg - 700)

550 + 0.5 (VHavg - 700)