MPC8315ECVRAGDA datasheet(64/112 Pages) FREESCALE

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MPC8315E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 0

Freescale Semiconductor

PCI Express

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]

0—

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

——

—

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

Parameter

Symbol

Comments

Min

Typical

Max

Units

Notes

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