EP80579 Datasheet, PDF (1850/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
49.5.3.3 PCI Express* Clock Specifications
Table 49-22. PCI Express* Clock DC Specifications
Symbol
Parameter
Min
Nom
Max
Unit Notes
V_IL
V_IH
V_CROSS(abs)
V_CROSS(rel)
Input Low Voltage
Input High Voltage
Absolute Crossing Point
Relative Crossing Point
–0.150
0.660
0.250
0.250 + 0.5
x (V_Havg
– 0.710)
0
0.710
0.150
0.850
0.550
0.550 + 0.5
x (V_Havg
– 0.710)
V
1
V
1
V
1, 2, 6
V 1, 3, 6, 7
ΔV_CROSS
V_RBM
V_TR
Range of Crossing Points
Ringback Margin
Threshold Region
0.200
V_CROSS
– 0.100
0.140
V
1
V
1, 4
V_CROSS
+ 0.100
V
1, 5
Notes:
1.
Refer to Figure 49-17 and Figure 49-18.
2.
Crossing voltage is defined as the instantaneous voltage when the rising edge of PEA_CLKp is equal
to the falling edge of PEA_CLKn.
3.
VHavg is the statistical average of the VH measured by the oscilloscope.
4.
Ringback Margin is defined as the absolute voltage difference between the maximum Rising Edge
Ringback and the maximum Falling Edge Ringback.
5.
Threshold Region is defined as a region entered around the crossing point voltage in which the
differential receiver switches. It includes input threshold hysteresis.
6.
The crossing point must meet the absolute and relative crossing point specifications simultaneously.
7.
VHavg can be measured directly using “Vtop” on Agilent* scopes and “High” on Tektronix* scopes.
Table 49-23. PCI Express* Clock Timings
Symbol
Parameter
Min
Typical Max
Units
Figure
Notes
Tp
Tccjitter
T5
ΔTrise
T6
PEA_CLK Frequency
Clock Tolerance
PEA_CLK Period
Cycle to Cycle Jitter
Duty Cycle
PEA_CLK Rise Time
PEA_CLK Rise Time
variation
PEA_CLK Fall Time
300
9.872
45
175
175
100
300
125
55
700
125
700
MHz
ppm
ns
ps
%
ps
ps
ps
49-17
49-17
49-17
ΔTfall
PEA_CLK Fall Time
variation
125
ps
PEA_CLK Slew Rate
0.5
1.6
V/ns
1, 2
Rise/Fall Matching
20
%
Notes:
1.
Rise/fall times and slew rates are measured single ended between 245 mV and 455 mV of the clock swing.
2.
Slew rate specifications apply to both rising and falling edges.
Intel^® EP80579 Integrated Processor Product Line Datasheet
1850
August 2009
Order Number: 320066-003US