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| 型号： | 405EX |
| 厂商： | Applied Micro Circuits Corp. |
| 英文描述： | PowerPC 405EX Embedded Processor |
| 中文描述： | 嵌入式处理器的PowerPC 405EX |
| 文件页数： | 54/67页 |
| 文件大小： | 457K |
| 代理商： | 405EX |
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PPC405EX – PowerPC 405EX Embedded Processor
58
AMCC Proprietary
Revision 1.09 - August 21, 2007
Preliminary Data Sheet
DDR 1/2 SDRAM I/O Specifications
The DDR SDRAM controller times its operation using the internal PLB clock signal and generates MemClkOut from
the PLB clock. The PLB clock is an internal signal that cannot be directly observed. However MemClkOut is the
same frequency as the PLB clock signal and is in phase with the PLB clock signal.
Note: MemClkOut can be advanced with respect to the PLB clock by means of the SDRAM0_CLKTR
programming register. In a typical system, users advance MemClkOut by 90
°. This depends on the specific
application and requires a thorough understanding of the memory system in general (refer to the DDR
SDRAM Controller chapter in the PPC405EX Embedded Processor User’s Manual).
The signals are terminated as indicated in Figure 6 for the DDR timing data in the following sections.
Board Layout Restrictions
TBP
Clocking
TBP
Figure 6. DDR SDRAM Simulation Signal Termination Model
DDR2 SDRAM On-Die Termination Impedance Setting
For all DDR2 applications, the On-Die Termination (ODT) impedance value must be set to 75 ohms in the DIMM
Extended Mode Register (EMR) in order to optimize the data transmission during memory write operations.
10pF
MemClkOut
120
Ω
50
Ω
30pF
Addr/Ctrl/Data/DQS/DM (DDR1)
VTT = SOVDD/2
PPC405EX
Addr/Ctrl (DDR2)
Note: This diagram illustrates the model of the DDR SDRAM interface used when generating simulation timing data.
It is not a recommended physical circuit design for this interface. An actual interface design will depend on many
factors, including the type of memory used and the board layout.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 405EXR | 制造商:AMCC 制造商全称:Applied Micro Circuits Corporation 功能描述:Embedded Processor |
| 405EZ | 制造商:AMCC 制造商全称:Applied Micro Circuits Corporation 功能描述:PowerPC 405EZ Embedded Processor |
| 405F | 功能描述:鼓风机 40x10mm 5VDC 4.7CFM .7W 5400RPM 23dBA SB RoHS:否 制造商:Murata 产品:Blowers 电流类型:DC 电源电压:5.3 V 气流:1 l/min 轴承类型: 噪声: 速度: 功率额定值: 框架尺寸 (mm):20 mm x 20 mm x 1.85 mm 外壳材料: 端接类型:SMD/SMT 系列:MZB |
| 405F | 制造商:ebm-papst Inc 功能描述:FAN 40MM 5VDC |
| 405F/2H | 功能描述:风扇 40x40x10mm 5VDC RoHS:否 制造商:Sanyo Denki 产品:Fans 电流类型: 电源电压:48 V 气流:636 CFM 轴承类型: 噪声:83 dBA 速度:6400 RPM 功率额定值:264 W 框架尺寸 (mm):172 mm x 150 mm x 102 mm 外壳材料:Aluminum 端接类型:Wire 系列: |
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