参数资料
型号: MPC8569EVTAUNL
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: RISC PROCESSOR, PBGA783
封装: 29 X 29 MM, 1 MM PITCH, PLASTIC, BGA-783
文件页数: 103/126页
文件大小: 2847K
代理商: MPC8569EVTAUNL
MPC8569E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 0
High-Speed SerDes Interfaces (HSSI)
Freescale Semiconductor
78
2.9.1
Signal Terms Definition
The SerDes utilizes differential signaling to transfer data across the serial link. This section defines terms used in the description
and specification of differential signals.
The below figure shows how the signals are defined. For illustration purposes only, one SerDes lane is used in the description.
The following figure shows the waveform for either a transmitter output (SDn_TX and SDn_TX) or a receiver input (SDn_RX
and SDn_RX). Each signal swings between A volts and B volts where A > B.
Figure 38. 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_TX, SD_TX, SD_RX and SD_RX
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_TX – VSD_TX. 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_RX – VSD_RX. 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 × VDIFFp = 2 × |(A – B)| volts, which is twice the differential swing in amplitude, or
twice of the differential peak. For example, the output differential peak-peak voltage can also be
calculated as VTX-DIFFp-p = 2 × |VOD|.
Differential Waveform
The differential waveform is constructed by subtracting the inverting signal (SD_TX, for example)
from the non-inverting signal (SD_TX, for example) within a differential pair. There is only one
Differential Swing, VID or VOD = A – B
A Volts
B Volts
SDn_TX or
SDn_RX
SDn_TX or
SDn_RX
Differential Peak Voltage, VDIFFp = |A – B|
Differential Peak-Peak Voltage, VDIFFpp = 2 * VDIFFp (not shown)
Vcm = (A + B)/2
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