MPC8308VMADDA datasheet(36/88 Pages) FREESCALE

36 / 88 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1

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

MPC8308VMADDA Datasheet(PDF) 36 Page - Freescale Semiconductor, Inc

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