641 datasheet(32/106 Pages) INTEL

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Electrical Specifications

Datasheet

2.7.4

BCLK[1:0] Specifications

§ §

Table 19.

Front Side Bus Differential BCLK Specifications

Symbol

Parameter

Min

Typ

Max

Unit Notes1

NOTES:

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

Input Low Voltage

-0.150

0.000

N/A

Input High Voltage

0.660

0.700

0.850

VCROSS(abs) Absolute Crossing Point

0.250

N/A

0.550

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.

VCROSS(rel) Relative Crossing Point

0.250 +

0.5(VHavg – 0.700)

N/A

0.550 +

0.5(VHavg – 0.700)

3, 4, 5

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.

∆VCROSS

Range of Crossing

Points

N/A

0.140

VOS

Overshoot

N/A

VH + 0.3

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

VUS

Undershoot

-0.300

N/A

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

VRBM

Ringback Margin

0.200

N/A

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

maximum Falling Edge Ringback.

VTM

Threshold Region

VCROSS – 0.100

N/A

VCROSS + 0.100

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.

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