MPC8572ECLPXATLD datasheet(80/140 Pages) FREESCALE

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MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

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 describes some AC parameters common to SGMII, PCI Express and Serial RapidIO protocols.

Figure 52. Differential Measurement Points for Rise and Fall Time

Table 59. SerDes Reference Clock Common AC Parameters

At recommended operating conditions with XVDD_SRDS1 or XVDD_SRDS2 = 1.1V ± 5%.

Parameter

Symbol

Min

Max

Unit

Notes

Rising Edge Rate

Rise Edge Rate

1.0

4.0

V/ns

2, 3

Falling Edge Rate

Fall Edge Rate

1.0

4.0

V/ns

2, 3

Differential Input High Voltage

VIH

+200

Differential Input Low Voltage

VIL

—-200

Rising edge rate (SDn_REF_CLK) to falling edge rate

(SDn_REF_CLK) matching

Rise-Fall

Matching

—20

1, 4

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 Figure 52.

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 Figure 53.

VIH = +200 mV

VIL = -200 mV

0.0 V

n_REF_CLK

minus

n_REF_CLK

MPC8572ECLPXATLD 数据表(PDF) 80 Page - Freescale Semiconductor, Inc

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