mpc8378e Freescale Semiconductor, Inc, mpc8378e Datasheet - Page 84

• Manufacturer Part Number: mpc8378e
• Description: Powerquicc Ii Pro Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

High-Speed Serial Interfaces (HSSI)
84
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SD n _REF_CLK
SD n _REF_CLK
SD n _REF_CLK
SD n _REF_CLK
Single-ended Mode
— The reference clock can also be single-ended. The SD _REF_CLK input amplitude
— The SDn_REF_CLK input average voltage must be between 200 mV and 400 mV.
— To meet the input amplitude requirement, the reference clock inputs might need to be DC or
Figure 56. Differential Reference Clock Input DC Requirements (External DC-Coupled)
Figure 57. Differential Reference Clock Input DC Requirements (External AC-Coupled)
(single-ended swing) must be between 400 mV and 800 mV
SDn_REF_CLK either left unconnected or tied to ground.
shows 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
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 3
Figure 58. Single-Ended Reference Clock Input DC Requirements
200 mV < Input Amplitude or Differential Peak < 800 mV
400 mV < SD n _REF_CLK Input Amplitude < 800 mV
200 mV < Input Amplitude or Differential Peak < 800 mV
p-p
(from V
100 mV < V
150
fdafdV
V
V
max
min
min
Freescale Semiconductor
> V
< V
to V
max
V
cm
max
cm
cm
0 V
< V
max
V
– 400m V
+ 400 mV
< 800 mV
< 400 mV
min
cm
) with
Figure 58
Vcm
> 0 V
+ 400 mV