MPC8315CVRADDA datasheet(65/106 Pages) FREESCALE

65 / 106 page

MPC8315E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

PCI Express

16.4.3

Differential Receiver (RX) Input Specifications

This table defines the specifications for the differential input at all receivers (RXs). The parameters are

specified at the component pins.

Table 55. Differential Receiver (RX) Input Specifications

Parameter

Symbol

Comments

Min

Typical

Max

Unit

Note

Unit interval

Each UI is 400 ps ± 300 ppm. UI

does not account for Spread

Spectrum Clock dictated

variations.

399.88

400

400.12

Differential peak-to-peak

output voltage

VRX-DIFFp-p

VRX-DIFFp-p = 2*|VRX-D+ - VRX-D-|

0.175

—

1.200

Minimum receiver eye width

TRX-EYE

The maximum interconnect

media and Transmitter jitter that

can be tolerated by the Receiver

can be derived as

TRX-MAX-JITTER = 1 - URX-EYE=

0.6 UI.

0.4

—

2, 3

Maximum time between the

jitter median and maximum

deviation from the median.

TRX-EYE-MEDIAN-to-MAX-JI

TTER

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.

—

0.3

2, 3, 7

AC peak common mode

input voltage

VRX-CM-ACp

VRX-CM-ACp = |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

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