mpc8378e Freescale Semiconductor, Inc, mpc8378e Datasheet - Page 89

• Manufacturer Part Number: mpc8378e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
At recommended operating conditions with XV
Rising edge rate (SD n _REF_CLK) to falling edge rate
(SD n _REF_CLK) matching
Note:
1
2
3
4
Measurement taken from single ended waveform.
Measurement taken from differential waveform.
Measured from –200 mV to +200 mV on the differential waveform (derived from SD n _REF_CLK minus SD n _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
Matching applies to rising edge rate for SD n _REF_CLK and falling edge rate for SD n _REF_CLK. It is measured using a
200 mV window centered on the median cross point where SDn_REF_CLK rising meets SD n _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 SD n _REF_CLK should be compared to the Fall Edge Rate of SD n _REF_CLK, the maximum allowed difference
should not exceed 20% of the slowest edge rate. See
SD n _REF_CLK
SD n _REF_CLK
VIH = +200 mV
VIL = –200 mV
Minus
SD n _REF_CLK
SD n _REF_CLK
0.0 V
V
CROSS MEDIAN
Figure 64. Single-Ended Measurement Points for Rise and Fall Time Matching
Table 67. SerDes Reference Clock Common AC Parameters (continued)
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
Parameter
Figure 63. Differential Measurement Points for Rise and Fall Time
Rise Edge Rate
DD_SRDS
or XV
Figure
DD_SRDS
63.
Figure
V
V
Rise-Fall Matching
CROSS MEDIAN
CROSS MEDIAN
= 1.0 V ± 5%.
64.
Symbol
SD n _REF_CLK
SD n _REF_CLK
V
CROSS MEDIAN
+100 mV
–100 mV
Fall Edge Rate
Min
—
T
FALL
High-Speed Serial Interfaces (HSSI)
Max
20
T
RISE
Unit
%
Notes
1, 4
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