参数资料
型号: MPC8536EAVTANGA
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 800 MHz, MICROPROCESSOR, PBGA783
封装: 29 X 29 MM, 2.80 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, FCBGA-783
文件页数: 125/127页
文件大小: 1893K
代理商: MPC8536EAVTANGA
High-Speed Serial Interfaces
MPC8536E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 3
Freescale Semiconductor
97
Figure 64 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 MPC8536E SerDes reference clock
input’s DC requirement, AC-coupling has to be used. Figure 64 assumes that the LVPECL clock driver’s output impedance is
50
Ω. R1 is used to DC-bias the LVPECL outputs prior to AC-coupling. Its value could be ranged from 140Ω to 240Ω depending
on clock driver vendor’s requirement. R2 is used together with the SerDes reference clock receiver’s 50-
Ω termination resistor
to attenuate the LVPECL output’s differential peak level such that it meets the MPC8536E SerDes reference clock’s differential
input amplitude requirement (between 200mV and 800mV differential peak). For example, if the LVPECL output’s differential
peak is 900mV and the desired SerDes reference clock input amplitude is selected as 600mV, the attenuation factor is 0.67,
which requires R2 = 25
Ω. Please consult clock driver chip manufacturer to verify whether this connection scheme is compatible
with a particular clock driver chip.
Figure 64. AC-Coupled Differential Connection with LVPECL Clock Driver (Reference Only)
Figure 65 shows the SerDes reference clock connection reference circuits for a single-ended clock driver. It assumes the DC
levels of the clock driver are compatible with MPC8536E SerDes reference clock input’s DC requirement.
Figure 65. Single-Ended Connection (Reference Only)
50
Ω
50
Ω
SDn_REF_CLK
Clock Driver
100
Ω differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
LVPECL CLK
Driver Chip
R2
R1
MPC8536E
R1
10nF
10 nF
50
Ω
50
Ω
SDn_REF_CLK
100
Ω differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
Single-Ended
CLK Driver Chip
33
Ω
Total 50
Ω. Assume clock driver’s
output impedance is about 16
Ω.
50
Ω
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