MPC8548E datasheet(71/143 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 8

Freescale Semiconductor

PCI Express

VTX-CM-DC-ACTIVE-

IDLE-DELTA

Absolute delta of

dc common

mode voltage

during L0 and

electrical idle

0—

100

|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]

See Note 2.

VTX-CM-DC-LINE-DELTA Absolute delta of

DC common

mode between

D+ and D–

0—

|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–|.

See Note 2.

VTX-IDLE-DIFFp

Electrical idle

differential peak

output voltage

0—

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

≤ 20 mV.

See Note 2.

VTX-RCV-DETECT

The amount of

voltage change

allowed during

receiver

detection

—

600

The total amount of voltage change that a

transmitter can apply to sense whether a low

impedance receiver is present. See Note 6.

VTX-DC-CM

The TX DC

common mode

voltage

—

3.6

The allowed DC common mode voltage under any

conditions. See Note 6.

ITX-SHORT

TX short circuit

current limit

—

The total current the transmitter can provide when

shorted to its ground

TTX-IDLE-MIN

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-SET-TO-IDLE

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 L0.

TTX-IDLE-TO-DIFF-DATA

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

RLTX-DIFF

Differential

return loss

—

Measured over 50 MHz to 1.25 GHz.

See Note 4.

RLTX-CM

Common mode

return loss

—

Measured over 50 MHz to 1.25 GHz.

See Note 4.

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

Symbol

Parameter

Min

Nom

Max

Unit

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