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MC8640TVU1000H Datasheet(PDF) 60 Page - Freescale Semiconductor, Inc |
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MC8640TVU1000H Datasheet(HTML) 60 Page - Freescale Semiconductor, Inc |
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60 / 140 page  MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1 60 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 47 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)/2 = (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 38. Differential Voltage Definitions for Transmitter or Receiver Differential Swing, VID or VOD = A - B A Volts B Volts SD n_TX or SD n_RX SD n_TX or SD n_RX Differential Peak Voltage, VDIFFp = |A - B| Differential Peak-Peak Voltage, VDIFFpp = 2*VDIFFp (not shown) Vcm = (A + B) / 2 |
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