参数资料
型号: MPC8547ECVTAQGB
厂商: Freescale Semiconductor
文件页数: 116/151页
文件大小: 0K
描述: MPU POWERQUICC III 783-PBGA
标准包装: 1
系列: MPC85xx
处理器类型: 32-位 MPC85xx PowerQUICC III
速度: 1.0GHz
电压: 1.1V
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
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9
Freescale Semiconductor
67
High-Speed Serial Interfaces (HSSI)
— The SD_REF_CLK and SD_REF_CLK are internally AC-coupled differential inputs as shown
in Figure 39. Each differential clock input (SD_REF_CLK or SD_REF_CLK) has a 50-
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. See 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 8 mA. 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 (see 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 0.4 V
(0.4 V/50 = 8 mA) while the minimum common mode input level is 0.1 V 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 0 to 16 mA (0–0.8 V), such that
each phase of the differential input has a single-ended swing from 0 V to 800 mV with the
common mode voltage at 400 mV.
— If the device driving the SD_REF_CLK and SD_REF_CLK inputs cannot drive 50
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 39. Receiver of SerDes Reference Clocks
16.2.2
DC Level Requirement for SerDes Reference Clocks
The DC level requirement for the SerDes reference clock inputs is different depending on the signaling
mode used to connect the clock driver chip and SerDes reference clock inputs as described below:
Differential mode
Input
Amp
50
50
SD_REF_CLK
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