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| 型号： | MPC8540VTAQFC |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 58/104页 |
| 文件大小： | 0K |
| 描述： | MPU POWERQUICC III 783FCPBGA |
| 标准包装： | 36 |
| 系列： | MPC85xx |
| 处理器类型： | 32-位 MPC85xx PowerQUICC III |
| 速度： | 1.0GHz |
| 电压： | 1.3V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 784-BBGA，FCBGA |
| 供应商设备封装： | 783-FCPBGA（29x29） |
| 包装： | 托盘 |
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MPC8540 Integrated Processor Hardware Specifications, Rev. 4.1
Freescale Semiconductor
57
RapidIO
The peak differential signal of the transmitter output or receiver input, is A – B volts.
The peak-to-peak differential signal of the transmitter output or receiver input, is 2
× (A – B) volts.
Figure 36. Differential Peak-to-Peak Voltage of Transmitter or Receiver
To illustrate these definitions using numerical values, consider the case where a LVDS transmitter has a
common mode voltage of 1.2 V and each signal has a swing that goes between 1.4 and 1.0 V. Using these
values, the peak-to-peak voltage swing of the signals TD, TD, RD, and RD is 400 mV. The differential
signal ranges between 400 and –400 mV. The peak differential signal is 400 mV, and the peak-to-peak
differential signal is 800 mV.
A timing edge is the zero-crossing of a differential signal. Each skew timing parameter on a parallel bus
is synchronously measured on two signals relative to each other in the same cycle, such as data to data,
data to clock, or clock to clock. A skew timing parameter may be relative to the edge of a signal or to the
middle of two sequential edges.
Static skew represents the timing difference between signals that does not vary over time regardless of
system activity or data pattern. Path length differences are a primary source of static skew.
Dynamic skew represents the amount of timing difference between signals that is dependent on the activity
of other signals and varies over time. Crosstalk between signals is a source of dynamic skew.
Eye diagrams and compliance masks are a useful way to visualize and specify driver and receiver
performance. This technique is used in several serial bus specifications. An example compliance mask is
shown in Figure 37. The key difference in the application of this technique for a parallel bus is that the data
is source synchronous to its bus clock while serial data is referenced to its embedded clock. Eye diagrams
reveal the quality (cleanness, openness, goodness) of a driver output or receiver input. An advantage of
using an eye diagram and a compliance mask is that it allows specifying the quality of a signal without
requiring separate specifications for effects such as rise time, duty cycle distortion, data dependent
dynamic skew, random dynamic skew, etc. This allows the individual semiconductor manufacturer
maximum flexibility to trade off various performance criteria while keeping the system performance
constant.
In using the eye pattern and compliance mask approach, the quality of the signal is specified by the
compliance mask. The mask specifies the maximum permissible magnitude of the signal and the minimum
permissible eye opening. The eye diagram for the signal under test is generated according to the
specification. Compliance is determined by whether the compliance mask can be positioned over the eye
diagram such that the eye pattern falls entirely within the unshaded portion of the mask.
Serial specifications have clock encoded with the data, but the LP-LVDS physical layer defined by
RapidIO is a source synchronous parallel port so additional specifications to include effects that are not
found in serial links are required. Specifications for the effect of bit to bit timing differences caused by
static skew have been added and the eye diagrams specified are measured relative to the associated clock
in order to include clock to data effects. With the transmit output (or receiver input) eye diagram, the user
can determine if the transmitter output (or receiver input) is compliant with an oscilloscope with the
appropriate software.
A V
B V
TD or RD
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| MPC8541CVTAJD | 功能描述:微处理器 - MPU PQ 37 LITE 8555 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 |
| MPC8541E PXAJD | 制造商:FREESCALE-SEMI 功能描述: |
| MPC8541ECPXAJD | 功能描述:微处理器 - MPU PQ 37 LITE 8555E 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 |
| MPC8541ECPXALF | 功能描述:微处理器 - MPU PQ 37 LITE 8555E 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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