參數(shù)資料
型號: MPC8544VTAQJB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 1000 MHz, RISC PROCESSOR, PBGA783
封裝: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-783
文件頁數(shù): 87/120頁
文件大?。?/td> 1321K
代理商: MPC8544VTAQJB
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
69
High-Speed Serial Interfaces (HSSI)
Single-ended Mode
— The reference clock can also be single-ended. The SDn_REF_CLK input amplitude
(single-ended swing) must be between 400 and 800 mV peak-peak (from Vmin to Vmax) with
SDn_REF_CLK either left unconnected or tied to ground.
—The SDn_REF_CLK input average voltage must be between 200 and 400 mV. Figure 48 shows
the SerDes reference clock input requirement for single-ended signaling mode.
— To meet the input amplitude requirement, the reference clock inputs might need to be DC or
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.
Figure 46. Differential Reference Clock Input DC Requirements (External DC-Coupled)
Figure 47. Differential Reference Clock Input DC Requirements (External AC-Coupled)
Figure 48. Single-Ended Reference Clock Input DC Requirements
SD
n_REF_CLK
SD
n_REF_CLK
Vmax < 800 mV
Vmin > 0 V
100 mV < Vcm < 400 mV
200 mV < Input Amplitude or Differential Peak < 800 mV
SD
n_REF_CLK
SD
n_REF_CLK
Vcm
200 mV < Input Amplitude or Differential Peak < 800 mV
Vmax < Vcm + 400 mV
Vmin > Vcm - 400 mV
SD
n_REF_CLK
SD
n_REF_CLK
400 mV < SDn_REF_CLK Input Amplitude < 800 mV
0V
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