mpc8314e Freescale Semiconductor, Inc, mpc8314e Datasheet - Page 59

• Manufacturer Part Number: mpc8314e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Table 52
Freescale Semiconductor
At recommended operating conditions with XCOREVDD= 1.0V ± 5%
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. Measurement taken from single ended waveform.
2. Measurement 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
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
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
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
SDn_REF_CL
K
V
V
IH
IL
=
= –200
describes some AC parameters common to SGMIIPCI Express protocols.
0.0 V
+200
SDn_REF_CLK
SDn_REF_CLK
minus
Figure 47. Single-Ended Measurement Points for Rise and Fall Time Matching
MPC8314E PowerQUICC
Figure 46. Differential Measurement Points for Rise and Fall Time
Parameter
Table 52. SerDes Reference Clock Common AC Parameters
™
Figure
II Pro Processor Hardware Specifications, Rev. 0
46.
Figure
SDn_REF_CLK
47.
SDn_REF_CLK
Rise Edge Rate
Fall Edge Rate
Matching
Rise-Fall
Symbol
V
V
IH
IL
+200
Min
1.0
1.0
—
—
High-Speed Serial Interfaces (HSSI)
–200
Max
4.0
4.0
—
20
V/ns
V/ns
Unit
mV
mV
%
Notes
2, 3
2, 3
1, 4
2
2
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