参数资料
型号: MPC8315ECVRAFDA
厂商: Freescale Semiconductor
文件页数: 61/106页
文件大小: 0K
描述: MPU POWERQUICC II PRO 620-PBGA
标准包装: 36
系列: MPC83xx
处理器类型: 32-位 MPC83xx PowerQUICC II Pro
速度: 333MHz
电压: 1V
安装类型: 表面贴装
封装/外壳: 620-BBGA 裸露焊盘
供应商设备封装: 620-PBGA(29x29)
包装: 托盘
MPC8315E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2
58
Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
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 240depending 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 MPC8315E 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
Please
consult clock driver chip manufacturer to verify whether this connection scheme is compatible with a
particular clock driver chip.
Figure 45. AC-Coupled Differential Connection with LVPECL Clock Driver (Reference Only)
This figure 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 MPC8315E SerDes reference clock
input’s DC requirement.
Figure 46. Single-Ended Connection (Reference Only)
50
50
SD_REF_CLK
Clock Driver
100
differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
LVPECL CLK
Driver Chip
R2
R1
MPC8315E
R1
10 nF
50
50
SD_REF_CLK
100
differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
Single-Ended
CLK Driver Chip
MPC8315E
33
Total 50
Assume clock driver’s
output impedance is about 16
50
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