MPC8378E datasheet(67/128 Pages) FREESCALE

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MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8

Freescale Semiconductor

15.4.1

Differential Transmitter (Tx) Output

This table defines the specifications for the differential output at all transmitters. The parameters are

specified at the component pins.

Table 57. Differential Transmitter (Tx) Output Specifications

Parameter

Conditions

Symbol

Min

Typical

Max

Units

Note

Unit interval

Each UPETX is 400 ps ± 300

ppm. UPETX does not account

for Spread Spectrum Clock

dictated variations.

399.88

400

400.12

Differential

peak-to-peak output

voltage

VPEDPPTX = 2 × |VTX-D+ –

VTX-D-|

VTX-DIFFp-p

0.8

—

1.2

De-emphasized

differential output

voltage (ratio)

Ratio of the VPEDPPTX of the

second and following bits after

a transition divided by the

VPEDPPTX of the first bit after a

transition.

VTX-DE-RATIO

–3.0

–3.5

–4.0

Minimum Tx eye width

The maximum transmitter

jitter can be derived as

TTX-MAX-JITTER = 1 –

UPEEWTX= 0.3 UI.

TTX-EYE

0.70

—

2, 3

Maximum time between

the jitter median and

maximum deviation

from the median

Jitter is defined as the

measurement variation of the

crossing points (VPEDPPTX = 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.

TTX-EYE-MEDIAN-to-

MAX-JITTER

—

0.15

2, 3

D+/D– Tx output

rise/fall time

—TTX-RISE, TTX-FALL

0.125

—

2, 5

RMS AC peak common

mode output voltage

VPEACPCMTX = RMS(|VTXD+ –

VTXD-|/2 – VTX-CM-DC)

VTX-CM-DC = DC(avg) of

|VTX-D+ – VTX-D-|/2

VTX-CM-ACp

——

Absolute delta of DC

common mode voltage

during LO and electrical

idle

|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]

VTX-CM-DC- ACTIVE-

IDLE-DELTA

0—

100

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