T2080NXE8MQLB View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

T2080NXE8MQLB

T2080 QorIQ integrated multicore communications processor

NXP Semiconductors. 

Electrical characteristics

3.19.4.3 PCI Express DC physical layer specifications

This section contains the DC specifications for the physical layer of PCI Express on this

chip.

3.19.4.3.1 PCI Express DC physical layer transmitter specifications

This section discusses the PCI Express DC physical layer transmitter specifications for

2.5 GT/s, 5 GT/s and 8 GT/s.

This table defines the PCI Express 2.0 (2.5 GT/s) DC specifications for the differential

output at all transmitters. The parameters are specified at the component pins.

Table 62. PCI Express 2.0 (2.5 GT/s) differential transmitter output DC specifications (XVDD

= 1.35 V)1

Parameter

Symbol Min Typical Max Units

Notes

Differential peak-to-peak

output voltage

VTX-DIFFp-p 800

1000

1200 mV VTX-DIFFp-p = 2 x │ VTX-D+ - VTX-D- │

De-emphasized differential VTX-DE-RATIO 3.0 3.5

output voltage (ratio)

DC differential transmitter ZTX-DIFF-DC 80

100

impedance

4.0 dB

120 Ω

Ratio of the VTX-DIFFp-p of the second and

following bits after a transition divided by the VTX-

DIFFp-p of the first bit after a transition.

Transmitter DC differential mode low Impedance

Transmitter DC impedance ZTX-DC

40 50

60

Ω

Required transmitter D+ as well as D- DC

Impedance during all states

Notes:

1. For recommended operating conditions, see Table 3.

This table defines the PCI Express 2.0 (5 GT/s) DC specifications for the differential

output at all transmitters. The parameters are specified at the component pins.

Table 63.

PCI Express

1.35 V)1

2.0

(5

GT/s)

differential

transmitter

output

DC

specifications

(XVDD

=

Parameter

Symbol

Min Typical Max Units

Notes

Differential peak-to-peak VTX-DIFFp-p

output voltage

800 1000

1200 mV VTX-DIFFp-p = 2 x │ VTX-D+ - VTX-D- │

Low power differential

peak-to-peak output

voltage

VTX-DIFFp-p_low

400 500

1200 mV VTX-DIFFp-p = 2 x │ VTX-D+ - VTX-D- │

De-emphasized differential VTX-DE-RATIO-3.5dB 3.0

3.5

output voltage (ratio)

De-emphasized differential VTX-DE-RATIO-6.0dB 5.5

6.0

output voltage (ratio)

4.0 dB Ratio of the VTX-DIFFp-p of the second and

following bits after a transition divided by the

VTX-DIFFp-p of the first bit after a transition.

6.5 dB Ratio of the VTX-DIFFp-p of the second and

following bits after a transition divided by the

VTX-DIFFp-p of the first bit after a transition.

Table continues on the next page...

QorIQ T2080 Data Sheet, Rev. 3, 03/2018

108

NXP Semiconductors

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