MPC8640DEC datasheet(71/140 Pages) FREESCALE

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MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

PCI Express

14.4.1

Differential Transmitter (TX) Output

Table 48 defines the specifications for the differential output at all transmitters (TXs). The parameters are

specified at the component pins.

Table 48. Differential Transmitter (TX) Output Specifications

Symbol

Parameter

Min

Nom

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

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 LO and

Electrical Idle

100

|VTX-CM-DC (during LO) - VTX-CM-Idle-DC (During Electrical

Idle)|<=100 mV

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

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–

025

|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

020

VTX-IDLE-DIFFp = |VTX-IDLE-D+ -VTX-IDLE-D-| <= 20 mV

See Note 2.

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