MPC8308VMADDA datasheet(36/88 Pages) FREESCALE

36 / 88 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0

Freescale Semiconductor

PCI Express

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

VPEACPCMTX =

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 VPEEIDPTX = |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

——UI—

Table 34. Differential Transmitter (TX) Output Specifications (continued)

Parameter

Symbol

Comments

Min

Typical

Max

Units

Notes

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