参数资料
型号: KMPC8544EAVTANG
厂商: Freescale Semiconductor
文件页数: 86/117页
文件大小: 0K
描述: IC MPU POWERQUICC III 783-PBGA
标准包装: 2
系列: MPC85xx
处理器类型: 32-位 MPC85xx PowerQUICC III
速度: 800MHz
电压: 1V
安装类型: 表面贴装
封装/外壳: 783-BBGA,FCBGA
供应商设备封装: 783-FCPBGA(29x29)
包装: 托盘
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 6
70
Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
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 140 to 240
Ω depending on clock driver
vendor’s requirement. R2 is used together with the SerDes reference clock receiver’s 50-
Ωtermination
resistor to attenuate the LVPECL output’s differential peak level such that it meets the MPC8544E SerDes
reference clock’s differential input amplitude requirement (between 200 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
Ω. Please
consult clock driver chip manufacturer to verify whether this connection scheme is compatible with a
particular clock driver chip.
Figure 51. AC-Coupled Differential Connection with LVPECL Clock Driver (Reference Only)
Figure 52 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 MPC8544E SerDes reference clock
input’s DC requirement.
Figure 52. 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
10nF
MPC8544E
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
MPC8544E
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