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参数资料
| 型号： | 440GX |
| 厂商： | Applied Micro Circuits Corp. |
| 英文描述： | Power PC 440GX Embedded Processor |
| 中文描述： | 超出了Power PC嵌入式处理器 |
| 文件页数： | 63/93页 |
| 文件大小： | 794K |
| 代理商： | 440GX |
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440GX – Power PC 440GX Embedded Processor
66
AMCC
Revision 1.15 – August 30, 2007
Data Sheet
Spread Spectrum Clocking
Care must be taken when using a spread spectrum clock generator (SSCG) with the PPC440GX. This controller
uses a PLL for clock generation inside the chip. The accuracy with which the PLL follows the SSCG is referred to
as tracking skew. The PLL bandwidth and phase angle determine how much tracking skew there is between the
SSCG and the PLL for a given frequency deviation and modulation frequency. When using an SSCG with the
PPC440GX the following conditions must be met:
The frequency deviation must not violate the minimum clock cycle time. Therefore, when operating the
PPC440GX with one or more internal clocks at their maximum supported frequency, the SSCG can only lower
the frequency.
The maximum frequency deviation cannot exceed
3%, and the modulation frequency cannot exceed 40kHz.
In some cases, on-board PPC440GX peripherals impose more stringent requirements.
Use the Peripheral Bus Clock for logic that is synchronous to the peripheral bus since this clock tracks the
modulation.
Use the DDR SDRAM MemClkOut since it also tracks the modulation.
For PCI-X and PCI 66 the maximum spread spectrum is -1% modulated between 30kHz and 33kHz.
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. The 1.5% tolerance assumes that
the connected device is running at precise baud rates.
2. Ethernet operation is unaffected.
3. IIC operation is unaffected.
Important: It is up to the system designer to ensure that any SSCG used with the PPC440GX meets the above
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 |
|---|---|
| 440HA002M1507-N | 功能描述:环形MIL规格后盖 RoHS:否 制造商:Amphenol PCD MIL 类型:MIL-DTL-38999 III, IV 系列:AS85049 产品类型:Environmental EMI/RFI Backshells 外壳类型:Straight 外壳大小:18 外壳材质:Aluminum Alloy |
| 440HA002N2312-C | 功能描述:环形MIL规格后盖 RoHS:否 制造商:Amphenol PCD MIL 类型:MIL-DTL-38999 III, IV 系列:AS85049 产品类型:Environmental EMI/RFI Backshells 外壳类型:Straight 外壳大小:18 外壳材质:Aluminum Alloy |
| 440HA002NF0902-N | 功能描述:环形MIL规格后盖 RoHS:否 制造商:Amphenol PCD MIL 类型:MIL-DTL-38999 III, IV 系列:AS85049 产品类型:Environmental EMI/RFI Backshells 外壳类型:Straight 外壳大小:18 外壳材质:Aluminum Alloy |
| 440HA002NF0903-N | 功能描述:环形MIL规格后盖 RoHS:否 制造商:Amphenol PCD MIL 类型:MIL-DTL-38999 III, IV 系列:AS85049 产品类型:Environmental EMI/RFI Backshells 外壳类型:Straight 外壳大小:18 外壳材质:Aluminum Alloy |
| 440HA002NF1102-N | 功能描述:环形MIL规格后盖 RoHS:否 制造商:Amphenol PCD MIL 类型:MIL-DTL-38999 III, IV 系列:AS85049 产品类型:Environmental EMI/RFI Backshells 外壳类型:Straight 外壳大小:18 外壳材质:Aluminum Alloy |
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