MPC8569E datasheet(88/127 Pages) FREESCALE

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MPC8569E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1

PCI Express

Freescale Semiconductor

2.10.3.2

PCI Express AC Physical Layer Receiver Specifications

This section discusses the PCI Express AC physical layer receiver specifications for 2.5 Gb/s.

AC-coupling

capacitor

CTX

—

200

All transmitters are 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 compliance test load as shown in Figure 46 and measured over

any 250 consecutive TX UIs.

3. A TTX-EYE = 0.70 UI provides for a total sum of deterministic and random jitter budget of TTX-JITTER-MAX = 0.30 UI for the

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

TX jitter budget collected over any 250 consecutive TX UIs. It must 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 MPC8569E SerDes transmitter does not have CTX built-in. An external AC-coupling capacitor is required.

Table 51. PCI Express (2.5Gb/s) Differential Transmitter (TX) Output AC Specifications (continued)

At recommended operating conditions with XVDD = 1.0 V ± 3%. and 1.1 V ± 3%

Parameter

Symbol

Min

Typ

Max

Unit

Comments

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