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MPC8379E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8

Freescale Semiconductor

output driver features a 50-

Ω termination resistor. It also assumes that the LVDS transmitter establishes its

own common mode level without relying on the receiver or other external component.

Figure 54. AC-Coupled Differential Connection with LVDS Clock Driver (Reference Only)

Figure 55 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 55 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

Ω to 240 Ω 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 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

Ω. Consult clock

n_REF_CLK

Clock Driver

100

Ω differential PWB trace

SerDes Refer.

CLK Receiver

Clock Driver

CLK_Out

LVDS CLK Driver Chip

10 nF

Chip

相关代理商/技术参数	参数描述
MPC8379E-RDBA	制造商:Freescale Semiconductor 功能描述:MPC8379E-RDB Reference Platform
MPC8379EVRAFDA	制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC? II Pro Processor Hardware Specifications
MPC8379EVRAFFA	制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC? II Pro Processor Hardware Specifications
MPC8379EVRAFGA	制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC? II Pro Processor Hardware Specifications
MPC8379EVRAGD	功能描述:微处理器 - MPU PBGA W/ ENCR RoHS:否制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324

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