X6800 Datasheet, PDF (34/122 Pages) Intel Corporation – Core2 Extreme Processor

Electrical Specifications
2.7.9 BCLK[1:0] Specifications (CK410 based Platforms)
Table 19. Front Side Bus Differential BCLK Specifications
Symbol
Parameter
Min
Typ
Max
Unit Figure Notes¹
V_L
V_H
V_CROSS(abs)
Input Low Voltage
Input High Voltage
Absolute Crossing
Point
-0.150
0.660
0.250
0.000
0.700
N/A
N/A
0.850
0.550
V
4
-
V
4
-
V
4, 5
2, 3
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, 3, 5
ΔV_CROSS
Range of Crossing
Points
N/A
N/A
0.140
V
4, 5
-
V_OS
Overshoot
N/A
N/A
V_H + 0.3
V
4
6
V_US
Undershoot
-0.300
N/A
N/A
V
4
7
V_RBM
Ringback Margin
0.200
N/A
N/A
V
4
8
V_TM
Threshold Region
V_CROSS – 0.100
N/A
V_CROSS + 0.100
V
4
9
NOTES:
1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.
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.
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.
6. Overshoot is defined as the absolute value of the maximum voltage.
7. Undershoot is defined as the absolute value of the minimum voltage.
8. Ringback Margin is defined as the absolute voltage difference between the maximum Rising Edge Ringback
and the maximum Falling Edge Ringback.
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.
Figure 7. Differential Clock Crosspoint Specification
650
600
550
500
550 + 0.5 (VHavg - 700)
450
550 mV
400
250 + 0.5 (VHavg - 700)
350
300
250 mV
250
200
660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850
VHavg (mV)
34
Datasheet