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| 型号： | MPC8308-KIT |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 20/83页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MPC830X |
| 标准包装： | 1 |
| 系列： | PowerQUICC II™ PRO |
| 类型： | MPU |
| 适用于相关产品： | MPC8308 |
| 所含物品： | 板，线缆，CD，电源 |
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MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 3
Freescale Semiconductor
27
High-Speed Serial Interfaces (HSSI)
10.2.1
SerDes Reference Clock Receiver Characteristics
Figure 16 shows a receiver reference diagram of the SerDes reference clocks.
SerDes reference clock receiver reference circuit structure
— The SD_REF_CLK and SD_REF_CLK are internally AC-coupled differential inputs as shown
in Figure 16. Each differential clock input (SD_REF_CLK or SD_REF_CLK) has a 50-
termination to 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 0.4 V
(0.4 V/50 = 8 mA) while the minimum common mode input level is 0.1 V above 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 (0–0.8 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 400mV.
— If the device driving the SD_REF_CLK and SD_REF_CLK inputs cannot drive 50
to
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 16. Receiver of SerDes Reference Clocks
Input
Amp
50
50
SD_REF_CLK
相关PDF资料 |
PDF描述 |
|---|---|
| EBA22DTMH | CONN EDGECARD 44POS R/A .125 SLD |
| EBA22DTMD | CONN EDGECARD 44POS R/A .125 SLD |
| EBM36DCSN | CONN EDGECARD 72POS DIP .156 SLD |
| EBA22DTBN | CONN EDGECARD 44POS R/A .125 SLD |
| EBM36DCSH | CONN EDGECARD 72POS DIP .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC8308-NSG | 功能描述:开发板和工具包 - 其他处理器 MPC8308-NSG RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| MPC8308-NSG | 制造商:Freescale Semiconductor 功能描述:MPC8308-NSG*NIC* |
| MPC8308-RDB | 功能描述:开发板和工具包 - 其他处理器 Refer. Board MPC8308 RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
| MPC8308-RDB-PROMO | 制造商:Freescale 功能描述:Motherboards MPC8308 PowerQuicc II DDR2 10Mbps/100Mbps/1000Mbps Linux Kernel |
| MPC8308-SOM | 功能描述:开发板和工具包 - 其他处理器 For MPC8308 Ethernet USB 32bit RoHS:否 制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压: |
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