MPC8378CVRALDA datasheet(67/126 Pages) FREESCALE

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MPC8378E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

PCI Express

Absolute delta of DC

common mode

between D+ and D–

|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-|

VTX-CM-DC-LINE-

DELTA

0—

Electrical idle

differential peak output

voltage

VPEEIDPTX = |VTX-IDLE-D+

-VTX-IDLE-D-| ≤ 20 mV

VTX-IDLE-DIFFp

0—

Amount of voltage

change allowed during

receiver detection

The total amount of voltage

change that a transmitter can

apply to sense whether a low

impedance receiver is

present.

VTX-RCV-DETECT

—XPADVDD/2

600

Tx DC common mode

voltage

The allowed DC common

mode voltage under any

conditions.

VTX-DC-CM

0XPADVDD/2

—

Tx short circuit current

limit

The total current the

transmitter can provide when

shorted to its ground

ITX-SHORT

——

—

Minimum time spent in

electrical idle

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.

TTX-IDLE-MIN

—

Maximum time to

transition to a valid

electrical idle after

sending an electrical

idle ordered set

After sending an electrical idle

ordered set, the transmitter

must meet all electrical idle

specifications within this time.

This is considered a

debounce time for the

transmitter to meet electrical

idle after transitioning from

LO.

TTX-IDLE-SET-TO-IDLE

——

—

Maximum time to

transition to valid Tx

specifications after

leaving an electrical idle

condition

Maximum time to meet all Tx

specifications when

transitioning from electrical

idle to sending differential

data. This is considered a

debounce time for the Tx to

meet all Tx specifications after

leaving electrical idle

TTX-IDLE-TO-DIFF-DATA

——

—

Differential return loss

Measured over 50 MHz to

1.25 GHz.

RLTX-DIFF

—

Table 56. Differential Transmitter (Tx) Output Specifications (continued)

Parameter

Conditions

Symbol

Min

Typical

Max

Units

Notes

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