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MPC8313E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

of the differential pair must have a single-ended swing less than 800 mV and greater than

200 mV. This requirement is the same for both external DC-coupled or AC-coupled

connection.

— For external DC-coupled connection, as described in Section 9.2.1, “SerDes Reference Clock

Receiver Characteristics,” the maximum average current requirements sets the requirement for

average voltage (common mode voltage) to be between 100 and 400 mV. Figure 24 shows the

SerDes reference clock input requirement for the DC-coupled connection scheme.

— For external AC-coupled connection, there is no common mode voltage requirement for the

clock driver. Since the external AC-coupling capacitor blocks the DC level, the clock driver

and the SerDes reference clock receiver operate in different command mode voltages. The

SerDes reference clock receiver in this connection scheme has its common mode voltage set to

XCOREVSS. Each signal wire of the differential inputs is allowed to swing below and above

the command mode voltage (XCOREVSS). Figure 25 shows the SerDes reference clock input

requirement for AC-coupled connection scheme.

Single-ended mode

— The reference clock can also be single-ended. The SD_REF_CLK input amplitude

(single-ended swing) must be between 400 and 800 mV peak-to-peak (from Vmin to Vmax) with

SD_REF_CLK either left unconnected or tied to ground.

— The SD_REF_CLK input average voltage must be between 200 and 400 mV. Figure 26 shows

the SerDes reference clock input requirement for the single-ended signaling mode.

— To meet the input amplitude requirement, the reference clock inputs might need to be DC or

AC coupled externally. For the best noise performance, the reference of the clock could be DC

or AC coupled into the unused phase (SD_REF_CLK) through the same source impedance as

the clock input (SD_REF_CLK) in use.

Figure 24. Differential Reference Clock Input DC Requirements (External DC-Coupled)

SD_REF_CLK

Vmax < 800 mV

Vmin > 0 V

100 mV < Vcm < 400 mV

200 mV < Input Amplitude or Differential Peak < 800 mV

相关代理商/技术参数	参数描述
MPC8313ZQADDC	功能描述:微处理器 - MPU 8313 REV2.2 PB NO ENC 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
MPC8313ZQAFD	制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC? II Pro Processor Hardware Specifications
MPC8313ZQAFDA	制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC? II Pro Processor Hardware Specifications
MPC8313ZQAFDB	制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC? II Pro Processor Hardware Specifications
MPC8313ZQAFF	功能描述:微处理器 - MPU 8313 PB PBGA W/O 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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