P5021 datasheet(112/155 Pages) NXP

112 / 155 page

P5021 QorIQ Integrated Processor Data Sheet, Rev. 1

Electrical characteristics

Freescale Semiconductor

112

This table defines the PCI Express 2.0 (5 GT/s) AC specifications for the differential output at all transmitters. The parameters

are specified at the component pins. The AC timing specifications do not include RefClk jitter.

2.20.4.5.2

PCI Express AC physical layer receiver specifications

This section discusses the PCI Express AC physical layer receiver specifications 2.5 GT/s, and 5 GT/s.

Table 67. PCI Express 2.0 (5 GT/s) differential transmitter Output AC specifications

For recommended operating conditions, see Table 3.

Parameter

Symbol

Min

Typ

Max

Units

Notes

Unit Interval

199.94 200.00 200.06

Each UI is 400 ps ± 300 ppm. UI does not

account for spread spectrum clock dictated

variations. See Note 1.

Minimum transmitter eye width

TTX-EYE

0.75

—

The maximum transmitter jitter can be

derived as:

TTX-MAX-JITTER =1 – TTX-EYE =0.25 UI.

See Notes 2 and 3.

Transmitter RMS deterministic

jitter > 1.5 MHz

TTX-HF-DJ-DD

—

0.15

—

Transmitter RMS deterministic

jitter < 1.5 MHz

TTX-LF-RMS

—

3.0

—

Reference input clock RMS jitter (< 1.5 MHz)

at pin < 1 ps

AC coupling capacitor

CTX

—

200

All transmitters must be AC coupled. The AC

coupling is required either within the media

or within the transmitting component itself.

See Note 4.

Notes:

1. No test load is necessarily associated with this value.

2. Specified at the measurement point into a timing and voltage test load as shown in Figure 43 and measured over any 250

consecutive transmitter UIs.

3. A TTX-EYE = 0.75 UI provides for a total sum of deterministic and random jitter budget of TTX-JITTER-MAX = 0.25 UI for the

transmitter collected over any 250 consecutive transmitter UIs. The TTX-EYE-MEDIAN-to-MAX-JITTER median is less than half of

the total transmitter jitter budget collected over any 250 consecutive transmitter UIs. It should be noted that the median is not

the same as the mean. The jitter median describes the point in time where the number of jitter points on either side is

approximately equal as opposed to the averaged time value.

4. The chip’s SerDes transmitter does not have CTX built-in. An external AC coupling capacitor is required.

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