MPC8572ECLPXATLD datasheet(83/140 Pages) FREESCALE

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MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

PCI Express

Table 61. Differential Transmitter (TX) Output Specifications

Symbol

Parameter

Min

Nominal

Max

Units

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

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.

VTX-DC-CM

The TX DC

Common Mode

Voltage

—

3.6

The allowed DC Common Mode voltage under any

conditions. See Note 6.

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