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| 型号： | MPC8308-KIT |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 19/83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
26
Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
Common Mode Voltage, Vcm
The common mode voltage is equal to one-half of the sum of the voltages between each conductor
of a balanced interchange circuit and ground. In this example, for SerDes output,
Vcm_out =(VTXn +VTXn)/2 = (A + B) / 2, which is the arithmetic mean of the two complimentary
output voltages within a differential pair. In a system, the common mode voltage may often differ
from one component’s output to the other’s input. Sometimes, it may be even different between the
receiver input and driver output circuits within the same component. It is also referred as the DC
offset in some occasion.
Figure 15. Differential Voltage Definitions for Transmitter or Receiver
To illustrate these definitions using real values, consider the case of a current mode logic (CML)
transmitter that has a common mode voltage of 2.25 V and each of its outputs, TD and TD, has a swing
that goes between 2.5 V and 2.0 V. Using these values, the peak-to-peak voltage swing of each signal (TD
or TD) is 500 mV p-p, which is referred as the single-ended swing for each signal. In this example, since
the differential signaling environment is fully symmetrical, the transmitter output’s differential swing
(VOD) has the same amplitude as each signal’s single-ended swing. The differential output signal ranges
between 500 mV and –500 mV, in other words, VOD is 500 mV in one phase and –500 mV in the other
phase. The peak differential voltage (VDIFFp) is 500 mV. The peak-to-peak differential voltage (VDIFFp-p)
is 1000 mV p-p.
10.2
SerDes Reference Clocks
The SerDes reference clock inputs are applied to an internal PLL whose output creates the clock used by
the corresponding SerDes lanes. The SerDes reference clocks input is SD_REF_CLK and SD_REF_CLK
for PCI Express.
The following sections describe the SerDes reference clock requirements and some application
information.
Differential Swing, VID or VOD = A – B
A Volts
B Volts
TXn or RXn
Differential Peak Voltage, VDIFFp = |A – B|
Differential Peak-Peak Voltage, VDIFFpp = 2*VDIFFp (not shown)
Vcm = (A + B) / 2
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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