IMX53CEC datasheet(120/204 Pages) FREESCALE

120 / 204 page

i.MX53xD Applications Processors for Consumer Products, Rev. 2

120

Freescale Semiconductor

Electrical Characteristics

4.7.13.1.1

Reference Clock Jitter Measurement

The total phase jitter on the reference clock is specified at 3 ps RMS. There are numerous ways to measure

the reference clock jitter, one of which is as follows.

Using a high-speed sampling scope (20 GSamples/s), 1 million samples of the differential reference clock

are taken, and the zero-crossing times of each rising edge are calculated. From the zero-crossing data, an

average reference clock period is calculated. This average reference clock period is subtracted from each

sequential, instantaneous period to find the difference between each reference clock rising edge and the

ideal placement to produce the phase jitter sequence. The power spectral density (PSD) of the phase jitter

is calculated and integrated after being weighted with the transfer function shown in Figure 74. The square

root of the resultant integral is the RMS total phase jitter.

Figure 74. Weighting Function for RMS Phase Jitter Calculation

4.7.13.2

Transmitter and Receiver Characteristics

The SATA PHY meets or exceeds the electrical compliance requirements defined in the SATA

specification. The following subsections provide values obtained from a combination of simulations and

silicon characterization.

NOTE

The tables in the following sections indicate any exceptions to the SATA

specification or aspects of the SATA PHY that exceed the standard, as well

as provide information about parameters not defined in the standard.

4.7.13.2.1

SATA PHY Transmitter Characteristics

Table 78 provides specifications for SATA PHY transmitter characteristics.

Table 78. SATA2 PHY Transmitter Characteristics

Parameters

Symbol

Min

Typ

Max

Unit

Transmit common mode voltage

VCTM

0.4

—

0.6

Transmitter pre-emphasis accuracy (measured

change in de-emphasized bit)

—–0.5

—

0.5

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