参数资料
型号: MPC8544DVTANG
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA783
封装: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, FC-PBGA-783
文件页数: 97/128页
文件大小: 1411K
代理商: MPC8544DVTANG
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
70
Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
16.2.1
SerDes Reference Clock Receiver Characteristics
Figure 45 shows a receiver reference diagram of the SerDes reference clocks.
The supply voltage requirements for XVDD_SRDS2 are specified in Table 1 and Table 2.
SerDes Reference Clock Receiver Reference Circuit Structure
— The SDn_REF_CLK and SDn_REF_CLK are internally AC-coupled differential inputs as
shown in Figure 45. Each differential clock input (SDn_REF_CLK or SDn_REF_CLK) has a
50-
Ω termination to SGND_SRDSn (xcorevss) followed by on-chip AC-coupling.
— The external reference clock driver must be able to drive this termination.
— The SerDes reference clock input can be either differential or single-ended. Refer to the
Differential Mode and Single-ended Mode description below for further detailed requirements.
The maximum average current requirement that also determines the common mode voltage range
— When the SerDes reference clock differential inputs are DC coupled externally with the clock
driver chip, the maximum average current allowed for each input pin is 8mA. In this case, the
exact common mode input voltage is not critical as long as it is within the range allowed by the
maximum average current of 8 mA (refer to the following bullet for more detail), since the
input is AC-coupled on-chip.
— This current limitation sets the maximum common mode input voltage to be less than 0.4V
(0.4V/50 = 8mA) while the minimum common mode input level is 0.1V above SGND_SRDSn
(xcorevss). For example, a clock with a 50/50 duty cycle can be produced by a clock driver with
output driven by its current source from 0mA to 16mA (0-0.8V), such that each phase of the
differential input has a single-ended swing from 0V to 800mV with the common mode voltage
at 400mV.
— If the device driving the SDn_REF_CLK and SDn_REF_CLK inputs cannot drive 50 ohms to
SGND_SRDSn (xcorevss) DC, or it exceeds the maximum input current limitations, then it
must be AC-coupled off-chip.
The input amplitude requirement
— This requirement is described in detail in the following sections.
Figure 45. Receiver of SerDes Reference Clocks
Input
Amp
50
Ω
50
Ω
SDn_REF_CLK
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