MPC8572CLPXARLD FREESCALE [Freescale Semiconductor, Inc], MPC8572CLPXARLD Datasheet - Page 80

• Manufacturer Part Number: MPC8572CLPXARLD
• Description: MPC8572E PowerQUICC III Integrated Processor Hardware Specifications
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

High-Speed Serial Interfaces (HSSI)
occurs in the 1-15MHz range. The source impedance of the clock driver should be 50 ohms to match the
transmission line and reduce reflections which are a source of noise to the system.
Table 59
80
At recommended operating conditions with XV
Rising Edge Rate
Falling Edge Rate
Differential Input High Voltage
Differential Input Low Voltage
Rising edge rate (SDn_REF_CLK) to falling edge rate
(SDn_REF_CLK) matching
Notes:
1. Measurment taken from single ended waveform.
2. Measurment taken from differential waveform.
3. Measured from -200 mV to +200 mV on the differential waveform (derived from SDn_REF_CLK minus SDn_REF_CLK). The
signal must be monotonic through the measurement region for rise and fall time. The 400 mV measurement window is centered
on the differential zero crossing. See
4. Matching applies to rising edge rate for SDn_REF_CLK and falling edge rate for SDn_REF_CLK. It is measured using a 200
mV window centered on the median cross point where SDn_REF_CLK rising meets SDn_REF_CLK falling. The median cross
point is used to calculate the voltage thresholds the oscilloscope is to use for the edge rate calculations. The Rise Edge Rate
of SDn_REF_CLK should be compared to the Fall Edge Rate of SDn_REF_CLK, the maximum allowed difference should not
exceed 20% of the slowest edge rate. See
SD n _REF_CLK
SD n _REF_CLK
V
V
IH
IL
= +200 mV
= -200 mV
describes some AC parameters common to SGMII, PCI Express and Serial RapidIO protocols.
0.0 V
minus
MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4
Figure 52. Differential Measurement Points for Rise and Fall Time
Parameter
Table 59. SerDes Reference Clock Common AC Parameters
Figure
DD_SRDS1
Figure
52.
or XV
53.
DD_SRDS2
= 1.1V ± 5%.
Rise Edge Rate
Fall Edge Rate
Matching
Rise-Fall
Symbol
V
V
IH
IL
+200
Min
1.0
1.0
—
—
-200
Max
4.0
4.0
20
Freescale Semiconductor
V/ns
V/ns
Unit
mV
mV
%
Notes
2, 3
2, 3
1, 4
2
2