450 datasheet(32/100 Pages) INTEL

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Electrical Specifications

Datasheet

2.8.5

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

NOTES:

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

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

BCLK0 equals the falling edge of BCLK1.

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

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

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

Ringback Margin is defined as the absolute voltage difference between the maximum

Rising Edge Ringback and the maximum Falling Edge Ringback.

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

the differential receiver switches. It includes input threshold hysteresis.

The crossing point must meet the absolute and relative crossing point specifications

simultaneously.

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

Tektronix* oscilloscopes.

Table 18.

Front Side Bus Differential BCLK Specifications

Symbol

Parameter

Min

Typ

Max

Unit Figure Notes1

Input Low Voltage

-0.150

0.00

N/A

Input High Voltage

0.660

0.70

0.850

CROSS(abs)

Absolute Crossing

Point

0.250

N/A

0.550

3, 4

2, 8

CROSS(rel)

Relative Crossing Point

0.250 +

0.5(

Havg – 0.700)

N/A

0.550 +

0.5(

Havg – 0.700)

3, 4

3, 8, 9

ΔV

CROSS

Range of Crossing

Points

N/A

0.140

3, 4

Overshoot

N/A

H + 0.3

Undershoot

-0.300

N/A

RBM

Ringback Margin

0.200

N/A

Threshold Region

VCROSS – 0.100

N/A

VCROSS + 0.100

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