MPC8548E datasheet(74/143 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 8

Freescale Semiconductor

PCI Express

TRX-EYE

Minimum

receiver eye

width

0.4

—

The maximum interconnect media and transmitter

jitter that can be tolerated by the receiver can be

derived as TRX-MAX-JITTER =1 – TRX-EYE = 0.6 UI.

See Notes 2 and 3.

TRX-EYE-MEDIAN-to-

MAX-JITTER

Maximum time

between the

jitter median and

maximum

deviation from

the median

—

0.3

Jitter is defined as the measurement variation of

the crossing points (VRX-DIFFp-p = 0 V) in relation

to a recovered TX UI. A recovered TX UI is

calculated over 3500 consecutive unit intervals of

sample data. Jitter is measured using all edges of

the 250 consecutive UI in the center of the

3500 UI used for calculating the TX UI.

See Notes 2, 3, and 7.

VRX-CM-ACp

AC peak

common mode

input voltage

——

150

VRX-CM-ACp = |VRXD+ – VRXD-|/2 + VRX-CM-DC

VRX-CM-DC = DC(avg) of |VRX-D+ + VRX-D–| ÷ 2.

See Note 2.

RLRX-DIFF

Differential

return loss

—

Measured over 50 MHz to 1.25 GHz with the D+

and D– lines biased at +300 mV and –300 mV,

respectively. See Note 4.

RLRX-CM

Common mode

return loss

—

Measured over 50 MHz to 1.25 GHz with the D+

and D– lines biased at 0 V. See Note 4.

ZRX-DIFF-DC

DC differential

input impedance

100

120

RX DC differential mode impedance. See Note 5.

ZRX-DC

DC input

impedance

Required RX D+ as well as D– DC impedance

(50 ± 20% tolerance). See Notes 2 and 5.

ZRX-HIGH-IMP-DC

Powered down

DC input

impedance

200 k

—

Required RX D+ as well as D– DC impedance

when the receiver terminations do not have

power. See Note 6.

VRX-IDLE-DET-DIFFp-p

Electrical idle

detect threshold

—

175

VRX-IDLE-DET-DIFFp-p = 2 × |VRX-D+ –VRX-D–|.

Measured at the package pins of the receiver

TRX-IDLE-DET-DIFF-

ENTERTIME

Unexpected

electrical idle

enter detect

threshold

integration time

—

An unexpected electrical idle (VRX-DIFFp-p <

VRX-IDLE-DET-DIFFp-p) must be recognized no

longer than TRX-IDLE-DET-DIFF-ENTERING to signal

an unexpected idle condition.

Table 57. Differential Receiver (RX) Input Specifications (continued)

Symbol

Parameter

Min

Nom

Max

Unit

Comments

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