MPC8378E datasheet(72/127 Pages) FREESCALE

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MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

PCI Express

Minimum receiver eye

width

The maximum interconnect

media and transmitter jitter that

can be tolerated by the receiver

can be derived as

TRX-MAX-JITTER = 1 –

UPEEWRX = 0.6 UI.

TRX-EYE

0.4

——UI

2, 3

Maximum time between

the jitter median and

maximum deviation from

the median.

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.

TRX-EYE-MEDIAN-to

-MAX-JITTER

—

0.3

2, 3, 7

AC peak common mode

input voltage

VPEACPCMRX = |VRXD+ –

VRXD-|/2 – VRX-CM-DC

VRX-CM-DC = DC(avg) of |VRX-D+

– VRX-D-|/2

VRX-CM-ACp

—

150

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.

RLRX-DIFF

—

Common mode return

loss

Measured over 50 MHz to 1.25

GHz with the D+ and D– lines

biased at 0 V.

RLRX-CM

6—

—

DC differential input

impedance

RX DC differential mode

impedance.

ZRX-DIFF-DC

100

120

DC Input Impedance

Required RX D+ as well as D-

DC impedance (50 ± 20%

tolerance).

ZRX-DC

2, 5

Powered down DC input

impedance

Required RX D+ as well as D–

DC impedance when the

receiver terminations do not

have power.

ZRX-HIGH-IMP-DC

200 k

—

Electrical idle detect

threshold

VPEEIDT = 2 × |VRX-D+ -VRX-D-|

Measured at the package pins

of the receiver

VRX-IDLE-DET-DIFF

p-p

—

175

—

Table 58. Differential Receiver (Rx) Input Specifications (continued)

Parameter

Comments

Symbol

Min

Typical

Max

Units

Notes

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