E2000 datasheet(31/104 Pages) INTEL

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Datasheet

Electrical Specifications

2.8.5

BCLK[1:0] Specifications (CK410 based Platforms)

Table 18.

Front Side Bus Differential BCLK Specifications

Symbol

Parameter

Min

Typ

Max

Unit Figure Notes1

NOTES:

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

Input Low Voltage

-0.150

0.00

N/A

Input High Voltage

0.660

0.70

0.850

VCROSS(abs)

Absolute Crossing

Point

0.250

N/A

0.550

3, 4

2, 3

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

falling edge of BCLK1.

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

4, 3, 5

VHavg is the statistical average of the VH measured by the oscilloscope.

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

ΔVCROSS

Range of Crossing

Points

N/A

0.140

3, 4

VOS

Overshoot

N/A

VH + 0.3

vershoot is defined as the absolute value of the maximum voltage.

VUS

Undershoot

-0.300

N/A

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

VRBM

Ringback Margin

0.200

N/A

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

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 6.

Differential Clock Crosspoint Specification

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

VHavg (mV)

550 mV

250 mV

250 + 0.5 (VHavg - 700)

550 + 0.5 (VHavg - 700)

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