参数资料
型号: MPC8548VUAVGA
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 1500 MHz, MICROPROCESSOR, CBGA783
封装: 29 X 29 MM, 1 MM PITCH, FLIP CHIP, LEAD FREE, CERAMIC, BGA-783
文件页数: 101/142页
文件大小: 1504K
代理商: MPC8548VUAVGA
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
61
High-Speed Serial Interfaces (HSSI)
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.
2. 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.
3. 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.
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-to-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 to as the DC offset.
Figure 38. Differential Voltage Definitions for Transmitter or Receiver
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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