MPC8544E datasheet(74/117 Pages) FREESCALE

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MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5

Freescale Semiconductor

PCI Express

17.4.1

Differential Transmitter (TX) Output

Table 59 defines the specifications for the differential output at all transmitters. The parameters are

specified at the component pins.

Table 59. 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 LO and

electrical idle

0—

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–

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.

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