參數(shù)資料
型號: MPC8548PXAVHB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 1500 MHz, MICROPROCESSOR, PBGA783
封裝: 29 X 29 MM, 1 MM PITCH, FLIP CHIP, PLASTIC, BGA-783
文件頁數(shù): 105/142頁
文件大?。?/td> 1504K
代理商: MPC8548PXAVHB
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
65
High-Speed Serial Interfaces (HSSI)
LVPECL outputs can produce signal with too large amplitude and may need to be DC-biased at
clock driver output first, then followed with series attenuation resistor to reduce the amplitude, in
addition to AC-coupling.
NOTE
Figure 43 through Figure 46 below are for conceptual reference only. Due
to the fact that clock driver chip's internal structure, output impedance and
termination requirements are different between various clock driver chip
manufacturers, it’s very possible that the clock circuit reference designs
provided by clock driver chip vendor are different from what is shown
below. They might also vary from one vendor to the other. Therefore,
Freescale Semiconductor can neither provide the optimal clock driver
reference circuits, nor guarantee the correctness of the following clock
driver connection reference circuits. The system designer is recommended
to contact the selected clock driver chip vendor for the optimal reference
circuits with the MPC8548E SerDes reference clock receiver requirement
provided in this document.
Figure 43 shows the SerDes reference clock connection reference circuits for HCSL type clock driver. It
assumes that the DC levels of the clock driver chip is compatible with MPC8548E SerDes reference clock
input’s DC requirement.
Figure 43. DC-Coupled Differential Connection with HCSL Clock Driver (Reference Only)
Figure 44 shows the SerDes reference clock connection reference circuits for LVDS type clock driver.
Since LVDS clock driver’s common mode voltage is higher than the MPC8548E SerDes reference clock
input’s allowed range (100 to 400mV), AC-coupled connection scheme must be used. It assumes the
LVDS output driver features 50-
Ω termination resistor. It also assumes that the LVDS transmitter
establishes its own common mode level without relying on the receiver or other external component.
50
Ω
50
Ω
SD_REF_CLK
Clock Driver
100
Ω Differential PWB Trace
Clock driver vendor dependent
source termination resistor
CLK_Out
HCSL CLK Driver Chip
33
Ω
33
Ω
Total 50
Ω. Assume clock driver’s
output impedance is about 16
Ω.
MPC8548E
CLK_Out
SerDes Refer.
CLK Receiver
Clock Driver
相關(guān)PDF資料
PDF描述
MPC8543ECHXANGB 32-BIT, 800 MHz, MICROPROCESSOR, CBGA783
MPC8543ECVUANGA 32-BIT, 800 MHz, MICROPROCESSOR, CBGA783
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MPC8547HXAQGB 32-BIT, 1000 MHz, MICROPROCESSOR, CBGA783
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