參數(shù)資料
型號: MPC8544EAVTAQG
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA783
封裝: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, FC-PBGA-783
文件頁數(shù): 94/128頁
文件大?。?/td> 1411K
代理商: MPC8544EAVTAQG
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
68
Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
The Differential Input Voltage (or Swing) of the receiver, VID, is defined as the difference of the
two complimentary input voltages: VSDn_RX - VSDn_RX. The VID value can be either positive or
negative.
4. Differential Peak Voltage, VDIFFp
The peak value of the differential transmitter output signal or the differential receiver input signal
is defined as Differential Peak Voltage, VDIFFp = |A - B| Volts.
5. 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 of 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|.
6. Differential Waveform
The differential waveform is constructed by subtracting the inverting signal (SDn_TX, for
example) from the non-inverting signal (SDn_TX, for example) within a differential pair. There is
only one signal trace curve in a differential waveform. The voltage represented in the differential
waveform is not referenced to ground. Refer to Figure 44 as an example for differential waveform.
7. Common Mode Voltage, Vcm
The Common Mode Voltage is equal to one half of the sum of the voltages between each conductor
of a balanced interchange circuit and ground. In this example, for SerDes output, Vcm_out =
VSDn_TX + VSDn_TX = (A + B) / 2, which is the arithmetic mean of the two complimentary output
voltages within a differential pair. In a system, the common mode voltage may often differ from
one component’s output to the other’s input. Sometimes, it may be even different between the
receiver input and driver output circuits within the same component. It’s also referred as the DC
offset in some occasion.
Figure 44. Differential Voltage Definitions for Transmitter or Receiver
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
相關PDF資料
PDF描述
MPC8544EVTANG 32-BIT, 800 MHz, MICROPROCESSOR, PBGA783
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