參數(shù)資料
型號: MPC8568VTAUJJ
廠商: Freescale Semiconductor
文件頁數(shù): 99/139頁
文件大小: 0K
描述: MPU POWERQUICC III 1023-PBGA
標(biāo)準(zhǔn)包裝: 24
系列: MPC85xx
處理器類型: 32-位 MPC85xx PowerQUICC III
速度: 1.333GHz
電壓: 1.1V
安裝類型: 表面貼裝
封裝/外殼: 1023-BBGA,F(xiàn)CBGA
供應(yīng)商設(shè)備封裝: 1023-FCPBGA(33x33)
包裝: 托盤
MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
62
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: VSD_RX – VSD_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. 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 = VSD_TX
+ VSD_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 is also referred as the DC offset in
some occasion.
Figure 39. Differential Voltage Definitions for Transmitter or Receiver
To illustrate these definitions using real values, consider the case of a CML (Current Mode Logic)
transmitter that has a common mode voltage of 2.25 V and each of its outputs, TD and TD, has a swing
that goes between 2.5 V and 2.0 V. Using these values, the peak-to-peak voltage swing of each signal (TD
or TD) is 500 mV p-p, which is referred as the single-ended swing for each signal. In this example, since
the differential signaling environment is fully symmetrical, the transmitter output’s differential swing
(VOD) has the same amplitude as each signal’s single-ended swing. The differential output signal ranges
Differential Swing, VID or VOD = A – B
A Volts
B Volts
SD_TX or
SD_RX
SD_TX or
SD_RX
Differential Peak Voltage, VDIFFp = |A – B|
Differential Peak-Peak Voltage, VDIFFpp = 2*VDIFFp (not shown)
Vcm = (A + B) / 2
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