MPC8315CVRADDA datasheet(62/106 Pages) FREESCALE

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MPC8315E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

PCI Express

De-Emphasized

differential output voltage

(ratio)

VTX-DE-RATIO

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.

–3.0

–3.5

-4.0

Minimum TX eye width

TTX-EYE

The maximum Transmitter jitter can be

derived as TTX-MAX-JITTER = 1 - UTX-EYE=

0.3 UI.

0.70

—

2, 3

Maximum time between

the jitter median and

maximum deviation from

the median

TTX-EYE-MEDIAN-to-

MAX-JITTER

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.

—

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

VTX-CM-ACp

VTX-CM-ACp = RMS(|VTXD+ + VTXD-|/2 -

VTX-CM-DC)

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

——

Absolute delta of DC

common mode voltage

during L0 and electrical

idle

VTX-CM-DC- ACTIVE-

IDLE-DELTA

|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]

—

100

Absolute delta of DC

common mode between

D+ and D–

VTX-CM-DC-LINE-DELTA |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-|

0—

Electrical idle differential

peak output voltage

VTX-IDLE-DIFFp

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

<= 20 mV

0—

Amount of voltage change

allowed during receiver

detection

VTX-RCV-DETECT

The total amount of voltage change that a

transmitter can apply to sense whether a

low impedance Receiver is present.

—

600

TX DC common mode

voltage

VTX-DC-CM

The allowed DC Common Mode voltage

under any conditions.

——

3.6

TX short circuit current

limit

ITX-SHORT

The total current the Transmitter can

provide when shorted to its ground

——

—

Minimum time spent in

electrical idle

TTX-IDLE-MIN

Minimum time a Transmitter must be in

Electrical Idle Utilized by the Receiver to

start looking for an Electrical Idle Exit after

successfully receiving an Electrical Idle

ordered set

—

Table 54. Differential Transmitter (TX) Output Specifications (continued)

Parameter

Symbol

Comments

Min

Typical

Max

Unit

Note

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