Datasheet
Electrical Specifications
32 Datasheet
2.8.5 BCLK[1:0] Specifications (CK410 based Platforms)
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. V
Havg
is the statistical average of the V
H
measured by the oscilloscope.
4. Overshoot is defined as the absolute value of the maximum voltage.
5. Undershoot is defined as the absolute value of the minimum voltage.
6. Ringback Margin is defined as the absolute voltage difference between the maximum
Rising Edge Ringback and the maximum Falling Edge Ringback.
7. Threshold Region is defined as a region entered around the crossing point voltage in which
the differential receiver switches. It includes input threshold hysteresis.
8. The crossing point must meet the absolute and relative crossing point specifications
simultaneously.
9. V
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 Notes
1
V
L
Input Low Voltage -0.150
0.00
0
N/A V 3 -
V
H
Input High Voltage 0.660
0.70
0
0.850 V 3 -
V
CROSS(abs)
Absolute Crossing
Point
0.250 N/A 0.550 V 3, 4 2, 8
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 3, 4 3, 8, 9
ΔV
CROSS
Range of Crossing
Points
N/A N/A 0.140 V 3, 4 -
V
OS
Overshoot N/A N/A V
H
+ 0.3 V 3 4
V
US
Undershoot -0.300 N/A N/A V 3 5
V
RBM
Ringback Margin 0.200 N/A N/A V 3 6
V
TM
Threshold Region V
CROSS
– 0.100 N/A V
CROSS
+ 0.100 V 3 7