MPC8308CVMADDA datasheet(40/88 Pages) FREESCALE

40 / 88 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1

Freescale Semiconductor

PCI Express

Maximum time between

the jitter median and

maximum deviation from

the median.

TRX-EYE-MEDIAN-t

o-MAX-JITTER

Jitter is defined as the

measurement variation of

the crossing points

(VPEDPPRX = 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.

—

0.3

2, 3, 7

AC peak common mode

input voltage

VRX-CM-ACp

VPEACPCMRX = |VRXD+ +

VRXD-|/2 - VRX-CM-DC

VRX-CM-DC = DC(avg) of

|VRX-D+ + VRX-D-|/2

——

150

Differential return loss

RLRX-DIFF

Measured over 50 MHz to

1.25 GHz with the D+ and

D- lines biased at +300

mV and -300 mV,

respectively.

—

Common mode return

loss

RLRX-CM

Measured over 50 MHz to

1.25 GHz with the D+ and

D- lines biased at 0 V.

6—

—

DC differential input

impedance

ZRX-DIFF-DC

RX DC differential mode

impedance.

100

120

DC Input Impedance

ZRX-DC

Required RX D+ as well

as D- DC Impedance (50

± 20% tolerance).

2, 5

Powered down DC input

impedance

ZRX-HIGH-IMP-DC Required RX D+ as well

as D- DC Impedance

when the Receiver

terminations do not have

power.

200 k

—

Electrical idle detect

threshold

VRX-IDLE-DET-DIF

Fp-p

VPEEIDT = 2*|VRX-D+

-VRX-D-|

Measured at the package

pins of the Receiver

—

175

—

Unexpected Electrical Idle

Enter Detect Threshold

Integration Time

TRX-IDLE-DET-DIFF

ENTERTIME

An unexpected Electrical

Idle (Vrx-diffp-p <

Vrx-idle-det-diffp-p) must

be recognized no longer

than

Trx-idle-det-diff-entertime

to signal an unexpected

idle condition.

——

—

Table 35. Differential Receiver (RX) Input Specifications (continued)

Parameter

Symbol

Comments

Min

Typical

Max

Units

Notes

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