MPC8572ECLPXATLD datasheet(92/140 Pages) FREESCALE

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MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Serial RapidIO

17.5

Transmitter Specifications

LP-Serial transmitter electrical and timing specifications are stated in the text and tables of this section.

The differential return loss, S11, of the transmitter in each case shall be better than

•

–10 dB for (Baud Frequency)/10 < Freq(f) < 625 MHz, and

•

–10 dB + 10log(f/625 MHz) dB for 625 MHz

≤ Freq(f) ≤ Baud Frequency

The reference impedance for the differential return loss measurements is 100 Ohm resistive. Differential

return loss includes contributions from on-chip circuitry, chip packaging and any off-chip components

related to the driver. The output impedance requirement applies to all valid output levels.

It is recommended that the 20%-80% rise/fall time of the transmitter, as measured at the transmitter output,

in each case have a minimum value 60 ps.

It is recommended that the timing skew at the output of an LP-Serial transmitter between the two signals

that comprise a differential pair not exceed 25 ps at 1.25 GB, 20 ps at 2.50 GB and 15 ps at 3.125 GB.

Table 64. Short Run Transmitter AC Timing Specifications—1.25 GBaud

Characteristic

Symbol

Range

Unit

Notes

Min

Max

Output Voltage,

–0.40

2.30

Volts

Voltage relative to COMMON of

either signal comprising a

differential pair

Differential Output Voltage

VDIFFPP

500

1000

mV p-p

—

Deterministic Jitter

—

0.17

UI p-p

—

Total Jitter

—

0.35

UI p-p

—

Multiple output skew

SMO

—

1000

Skew at the transmitter output

between lanes of a multilane

link

Unit Interval

800

+/- 100 ppm

Table 65. Short Run Transmitter AC Timing Specifications—2.5 GBaud

Characteristic

Symbol

Range

Unit

Notes

Min

Max

Output Voltage,

–0.40

2.30

Volts

Voltage relative to COMMON of

either signal comprising a

differential pair

Differential Output Voltage

VDIFFPP

500

1000

mV p-p

—

Deterministic Jitter

—

0.17

UI p-p

—

Total Jitter

—

0.35

UI p-p

—

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