MPC8548E datasheet(73/144 Pages) FREESCALE

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MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 6

Freescale Semiconductor

PCI Express

Figure 48. Minimum Transmitter Timing and Voltage Output Compliance Specifications

16.4.3

Differential Receiver (RX) Input Specifications

Table 53 defines the specifications for the differential input at all receivers (RXs). The parameters are

specified at the component pins.

Table 53. Differential Receiver (RX) Input Specifications

Symbol

Parameter

Min

Nom

Max

Unit

Comments

Unit interval

399.88

400

400.12

Each UI is 400 ps ± 300 ppm. UI does not account

for spread spectrum clock dictated variations.

See Note 1.

VRX-DIFFp-p

Differential

peak-to-peak

input voltage

0.175

—

1.200

VRX-DIFFp-p = 2 × |VRX-D+ – VRX-D–|. See Note 2.

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.

VTX-DIFF = 0 mV

(D+ D– Crossing Point)

[De-Emphasized Bit]

0.07 UI = UI – 0.3 UI (JTX-TOTAL-MAX)

566 mV (3 dB) >=

VTX-DIFFp-p-MIN >= 505 mV (4 dB)

[Transition Bit]

VTX-DIFFp-p-MIN = 800 mV

VRX-DIFF = 0 mV

(D+ D– Crossing Point)

[Transition Bit]

VTX-DIFFp-p-MIN = 800 mV

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