MPC8610EC datasheet(61/96 Pages) FREESCALE

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Electrical Characteristics

MPC8610 Integrated Host Processor Hardware Specifications, Rev. 0

Freescale Semiconductor

Table 47 describes some AC parameters common to PCI Express protocols.

Figure 38. Differential Measurement Points for Rise and Fall Time

Figure 39. Single-Ended Measurement Points for Rise and Fall Time Matching

Table 47. SerDes Reference Clock Common AC Parameters

At recommended operating conditions with X1VDD or X2VDD = 1.0 V ± 5% and 1.025 V ± 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 (SD

n_REF_CLK) to falling edge rate

(SD

n_REF_CLK) matching

Rise-Fall

Matching

—20

1, 4

Notes:

1. Measurement taken from single ended waveform.

2. Measurement taken from differential waveform.

3. Measured from –200 to +200 mV on the differential waveform (derived from SD

n_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 38.

4. Matching applies to rising edge rate for SD

n_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 SD

n_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 SD

n_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 39.

VIH = +200 mV

VIL = -200 mV

0.0 V

n_REF_CLK

minus

n_REF_CLK

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