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| 型号： | 440GRX |
| 厂商： | Applied Micro Circuits Corp. |
| 英文描述： | PowerPC 440GRx Embedded Processor |
| 中文描述： | 嵌入式处理器的PowerPC 440GRx |
| 文件页数： | 70/88页 |
| 文件大小： | 603K |
| 代理商： | 440GRX |
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440GRx – PPC440GRx Embedded Processor
Preliminary Data Sheet
72
AMCC Proprietary
Revision 1.08 – October 15, 2007
Spread Spectrum Clocking
Care must be taken when using a spread spectrum clock generator (SSCG) with the PPC440GRx. 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
PPC440GRx the following conditions must be met:
The frequency deviation must not violate the minimum clock cycle time. Therefore, when operating the
PPC440GRx 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 PPC440GRx 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.
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 PPC440GRx meets the above
requirements and does not adversely affect other aspects of the system.
相关PDF资料 |
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| 440GR | Power PC 440GR Embedded Processor |
| 440GX | Power PC 440GX Embedded Processor |
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| 440SP | PowerPC 440SP Embedded Processor |
| 4414-308 | 8 POS SOIC ADAPTER |
相关代理商/技术参数 |
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| 440GS001NF1934-4 | 功能描述:环形MIL规格后盖 CRIMIP RING ADPTR DC STRAIGHT 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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| 440GS031B2912-4 | 制造商:Glenair Inc 功能描述:Shrink Boot Adapters 180° 29 Shell Size Olive Drab Cadmium Aluminum Direct 制造商:Glenair 功能描述:Shrink Boot Adapters 180° 29 Shell Size Olive Drab Cadmium Aluminum Direct |
| 440GS031B3314-4 | 制造商:Glenair Inc 功能描述:Shrink Boot Adapters 180° 33 Shell Size Olive Drab Cadmium Aluminum Direct 制造商:Glenair 功能描述:Shrink Boot Adapters 180° 33 Shell Size Olive Drab Cadmium Aluminum Direct |
| 440GS031NF1102-3BT | 功能描述:环形MIL规格后盖 BND/SHRNK BOOT ADPTR DC STRT BAND BOOT 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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