mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 63

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
SD n _REF_CLK
SD n _REF_CLK
SD n _REF_CLK
SD n _REF_CLK
— The SDn_REF_CLK input average voltage must be between 200 and 400 mV.
— To meet the input amplitude requirement, the reference clock inputs might need to be DC or
Figure 40. Differential Reference Clock Input DC Requirements (External DC-Coupled)
Figure 41. Differential Reference Clock Input DC Requirements (External AC-Coupled)
the SerDes reference clock input requirement for single-ended signaling mode.
AC-coupled externally. For the best noise performance, the reference of the clock could be DC
or AC-coupled into the unused phase (SDn_REF_CLK) through the same source impedance as
the clock input (SDn_REF_CLK) in use.
SD n _REF_CLK
SD n _REF_CLK
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Figure 42. Single-Ended Reference Clock Input DC Requirements
200 mV < Input Amplitude or Differential Peak < 800 mV
200 mV < Input Amplitude or Differential Peak < 800 mV
400 mV < SD n _REF_CLK Input Amplitude < 800 mV
High-Speed Serial Interfaces (HSSI)
100 mV < Vcm < 400 mV
Vmin > Vcm - 400 mV
Vmax < Vcm + 400 mV
0V
Vmax < 800 mV
Vmin > 0V
Figure 42
Vcm
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