参数资料
型号: MPC8308CVMAFDA
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: RISC MICROCONTROLLER, PBGA473
封装: 19 X 19 MM, 1.39 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, PLASTIC, MABGA-473
文件页数: 24/90页
文件大小: 1123K
代理商: MPC8308CVMAFDA
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2
30
Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
NOTE
Figure 20–Figure 23 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 is very much 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 MPC8308 SerDes reference clock receiver requirement
provided in this document.
Figure 20 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 MPC8308 SerDes reference clock
input’s DC requirement.
Figure 20. DC-Coupled Differential Connection with HCSL Clock Driver (Reference Only)
50
Ω
50
Ω
SD_REF_CLK
Clock Driver
100
Ω differential PWB trace
Clock driver vendor dependent
source termination resistor
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
HCSL CLK Driver Chip
33
Ω
33
Ω
Total 50
Ω. Assume clock driver’s
output impedance is about 16
Ω.
MPC8308
CLK_Out
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