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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： | 48/67页 |
| 文件大小： | 457K |
| 代理商： | 405EX |
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PPC405EX – PowerPC 405EX Embedded Processor
52
AMCC Proprietary
Revision 1.09 - August 21, 2007
Preliminary Data Sheet
Spread Spectrum Clocking
Care must be taken if using a spread spectrum clock generator (SSCG) with the PPC405EX. This controller uses a
PLL for clock generation inside the chip. The accuracy with which the PLL follows the SSCG is called tracking
skew. The PLL bandwidth and phase angle determine how much tracking skew exists between the SSCG and the
PLL for a given frequency deviation and modulation frequency. If using an SSCG with the PPC405EX the following
conditions must be met:
The frequency deviation must not violate the minimum clock cycle time. Therefore, when operating the
PPC405EX with one or more internal clocks at their maximum supported frequency, the SSCG can only lower
the frequency.
The maximum frequency deviation must not exceed
3%, and the modulation frequency must not exceed
40kHz. In some cases, on-board PPC405EX peripherals impose more stringent requirements (see Note 1).
Use the peripheral bus clock for logic that is synchronous to the peripheral bus because this clock tracks the
modulation.
Notes:
1. The serial port baud rates are synchronous to the modulated clock. The serial port has a tolerance of
approximately 1.5% on baud rate before framing errors begin to occur, assuming that the connected device is
running at precise baud rates. If an external serial clock is used, baud rate is unaffected by the modulation.
2. Ethernet operation is unaffected.
3. IIC operation is unaffected.
Caution: The system designer must ensure that any SSCG used with the PPC405EX meets these requirements
and does not adversely affect other aspects of the system.
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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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