MPC8544EBVTALJ datasheet(77/120 Pages) FREESCALE

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MPC8544E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

PCI Express

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

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

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 LO.

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.

ZTX-DIFF-DC

DC differential TX

impedance

100

120

TX DC differential mode low impedance.

ZTX-DC

Transmitter DC

impedance

—

Required TX D+ as well as D– DC

Impedance during all states.

LTX-SKEW

Lane-to-lane output

skew

—

500 +

2 UI

Static skew between any two transmitter

lanes within a single link.

CTX

AC coupling capacitor

—

200

All transmitters shall be AC coupled. The

AC coupling is required either within the

media or within the transmitting component

itself.

Table 59. Differential Transmitter (TX) Output Specifications (continued)

Symbol

Parameter

Min

Nom

Max

Unit

Comments

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