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MPC8378E Datasheet(PDF) 86 Page - Freescale Semiconductor, Inc |
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MPC8378E Datasheet(HTML) 86 Page - Freescale Semiconductor, Inc |
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86 / 128 page  MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8 86 Freescale Semiconductor that the LVPECL clock driver’s output impedance is 50 Ω. R1 is used to DC-bias the LVPECL outputs prior to AC-coupling. Its value could be ranged from 140 Ω to 240 Ω depending on clock driver vendor’s requirement. R2 is used together with the SerDes reference clock receiver’s 50 Ω termination resistor to attenuate the LVPECL output’s differential peak level such that it meets the device SerDes reference clock’s differential input amplitude requirement (between 200 mV and 800 mV differential peak). For example, if the LVPECL output’s differential peak is 900 mV and the desired SerDes reference clock input amplitude is selected as 600 mV, the attenuation factor is 0.67, which requires R2 = 25 Ω. Consult clock driver chip manufacturer to verify whether this connection scheme is compatible with a particular clock driver chip. Figure 61. AC-Coupled Differential Connection with LVPECL Clock Driver (Reference Only) 50 Ω 50 Ω SD n_REF_CLK SD n_REF_CLK Clock Driver 100 Ω differential PWB trace SerDes Refer. CLK Receiver Clock Driver CLK_Out CLK_Out LVPECL CLK Driver Chip R2 R2 R1 R1 10 nF 10 nF Chip |
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