T2080NXE8MQLB View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

T2080NXE8MQLB

T2080 QorIQ integrated multicore communications processor

NXP Semiconductors. 

Electrical characteristics

A Volts

SD_TXn_P or

SD_RXn_P

Vcm= (A + B)/2

B Volts

SD_TXn_N or

SD_RXn_N

Differential swing, VID orVOD = A - B

Differential peak voltage, VDIFFp = |A - B|

Differential peak-to-peak voltage, VDIFFpp =2 x VDIFFp (not shown)

Figure 32. Differential voltage definitions for transmitter or receiver

Using this waveform, the definitions are as shown in the following list. To simplify the

illustration, the definitions assume that the SerDes transmitter and receiver operate in a

fully symmetrical differential signaling environment:

Single-Ended Swing

The transmitter output signals and the receiver input signals SD_TXn_P, SD_TXn_N,

SD_RXn_P and SD_RXn_N each have a peak-to-peak swing of A - B volts. This is

also referred as each signal wire's single-ended swing.

Differential Output Voltage, VOD (or Differential Output Swing)

The differential output voltage (or swing) of the transmitter, VOD, is defined as the

difference of the two complimentary output voltages: VSD_TXn_P- VSD_TXn_N. The VOD

value can be either positive or negative.

Differential Input Voltage, VID (or Differential Input Swing)

The differential input voltage (or swing) of the receiver, VID, is defined as the

difference of the two complimentary input voltages: VSD_RXn_P- VSD_RXn_N. The VID

value can be either positive or negative.

Differential Peak Voltage, VDIFFp

The peak value of the differential transmitter output signal or the differential receiver

input signal is defined as the differential peak voltage, VDIFFp = |A - B| volts.

Differential Peak-to-Peak, VDIFFp-p

Since the differential output signal of the transmitter and the differential input signal of

the receiver each range from A - B to -(A - B) volts, the peak-to-peak value of the

differential transmitter output signal or the differential receiver input signal is defined

as differential peak-to-peak voltage, VDIFFp-p = 2 x VDIFFp = 2 x |(A - B)| volts, which

is twice the differential swing in amplitude, or twice of the differential peak. For

example, the output differential peak-to-peak voltage can also be calculated as VTX-

DIFFp-p = 2 x |VOD|.

Differential Waveform

The differential waveform is constructed by subtracting the inverting signal

(SD_TXn_N, for example) from the non-inverting signal (SD_TXn_P, for example)

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

98

NXP Semiconductors

Share Link: