參數資料
型號: MPC8378EVRAGDA
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 266 MHz, MICROPROCESSOR, PBGA689
封裝: 31 X 31 MM, 2.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-689
文件頁數: 109/125頁
文件大?。?/td> 894K
代理商: MPC8378EVRAGDA
MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 5
Freescale Semiconductor
84
assumes that the LVDS transmitter establishes its own common mode level without relying on the receiver or other external
component.
Figure 60. AC-Coupled Differential Connection with LVDS Clock Driver (Reference Only)
Figure 61 shows the SerDes reference clock connection reference circuits for LVPECL type clock driver. Since LVPECL
driver’s DC levels (both common mode voltages and output swing) are incompatible with device SerDes reference clock input’s
DC requirement, AC-coupling has to be used. Figure 61 assumes that the LVPECL clock driver’s output impedance is 50
R1 is used to DC-bias the LVPECL outputs prior to AC-coupling. Its value could be ranged from 140
to 240 depending on
clock driver vendor’s requirement. R2 is used together with the SerDes reference clock receiver’s 50
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
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
50
SDn_REF_CLK
Clock Driver
100
differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
LVDS CLK Driver Chip
10 nF
MPC8378E
50
50
SDn_REF_CLK
Clock Driver
100
differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
LVPECL CLK Driver Chip
R2
R1
10 nF
MPC8378E
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