MPC8548ECPXATJB datasheet(74/151 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

Freescale Semiconductor

PCI Express

Table 56. Differential Transmitter (TX) Output Specifications

Symbol

Parameter

Min

Nom

Max

Unit

Comments

Unit interval

399.88

400

400.12

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

for spread spectrum clock dictated variations.

See Note 1.

VTX-DIFFp-p

Differential

peak-to-peak

output voltage

0.8

—

1.2

VTX-DIFFp-p = 2 × |VTX-D+ – VTX-D–|. See Note 2.

VTX-DE-RATIO

De- emphasized

differential

output voltage

(ratio)

–3.0

–3.5

–4.0

Ratio of the VTX-DIFFp-p of the second and

following bits after a transition divided by the

VTX-DIFFp-p of the first bit after a transition.

See Note 2.

TTX-EYE

Minimum TX

eye width

0.70

—

The maximum transmitter jitter can be derived as

TTX-MAX-JITTER = 1 – TTX-EYE = 0.3 UI.

See Notes 2 and 3.

TTX-EYE-MEDIAN-to-

MAX-JITTER

Maximum time

between the

jitter median and

maximum

deviation from

the median.

—

0.15

Jitter is defined as the measurement variation of

the crossing points (VTX-DIFFp-p = 0 V) in relation

to a recovered TX UI. A recovered TX UI is

calculated over 3500 consecutive unit intervals of

sample data. Jitter is measured using all edges of

the 250 consecutive UI in the center of the 3500

UI used for calculating the TX UI.

See Notes 2 and 3.

TTX-RISE, TTX-FALL

D+/D– TX output

rise/fall time

0.125

—

See Notes 2 and 5.

VTX-CM-ACp

RMS AC peak

common mode

output voltage

——

VTX-CM-ACp = RMS(|VTXD+ + VTXD–|/2 –

VTX-CM-DC)

VTX-CM-DC = DC(avg) of |VTX-D+ + VTX-D–|/2.

See Note 2.

VTX-CM-DC-ACTIVE-

IDLE-DELTA

Absolute delta of

dc common

mode voltage

during L0 and

electrical idle

0—

100

|VTX-CM-DC (during L0) + VTX-CM-Idle-DC (during

electrical idle)|  100 mV

VTX-CM-DC = DC(avg) of |VTX-D+ + VTX-D–|/2 [L0]

VTX-CM-Idle-DC = DC(avg) of |VTX-D+ +VTX-D–|/2

[electrical idle]

See Note 2.

VTX-CM-DC-LINE-DELTA Absolute delta of

DC common

mode between

D+ and D–

0—

|VTX-CM-DC-D+ – VTX-CM-DC-D–|  25 mV

VTX-CM-DC-D+ = DC(avg) of |VTX-D+|

VTX-CM-DC-D–= DC(avg) of |VTX-D–|.

See Note 2.

VTX-IDLE-DIFFp

Electrical idle

differential peak

output voltage

0—

VTX-IDLE-DIFFp = |VTX-IDLE-D+ – VTX-IDLE-D–|

 20 mV.

See Note 2.

VTX-RCV-DETECT

The amount of

voltage change

allowed during

receiver

detection

—

600

The total amount of voltage change that a

transmitter can apply to sense whether a low

impedance receiver is present. See Note 6.

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