Intel E6420 Data Sheet - Page 34
BCLK[1:0] Specifications CK410 based Platforms
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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 VL VH VCROSS(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 VCROSS(rel) Relative Crossing Point 0.250 + 0.5(VHavg - 0.700) N/A 0.550 + 0.5(VHavg - 0.700) V 4, 5 4, 3, 5 ΔVCROSS Range of Crossing Points N/A N/A 0.140 V 4, 5 - VOS Overshoot N/A N/A VH + 0.3 V 4 6 VUS Undershoot -0.300 N/A N/A V 4 7 VRBM Ringback Margin 0.200 N/A N/A V 4 8 VTM Threshold Region VCROSS - 0.100 N/A VCROSS + 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. VHavg is the statistical average of the VH measured by the oscilloscope. 5. VHavg 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 Crossing Point (mV) 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