參數(shù)資料
型號(hào)： PPC440EPx-NpAfffTs
廠商： Applied Micro Circuits Corp.
英文描述： PowerPC 440EPx Embedded Processor
中文描述： 嵌入式處理器的PowerPC 440EPx
文件頁(yè)數(shù)： 75/94頁(yè)
文件大?。?/td> 738K
代理商： PPC440EPX-NPAFFFTS
440EPx – PPC440EPx Embedded Processor
Revision 1.26 – October 15, 2007
Preliminary Data Sheet
AMCC Proprietary
75
Spread Spectrum Clocking
Care must be taken when using a spread spectrum clock generator (SSCG) with the PPC440EPx. 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
PPC440EPx the following conditions must be met:
The frequency deviation must not violate the minimum clock cycle time. Therefore, when operating the
PPC440EPx 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 40 kHz.
In some cases, on-board PPC440EPx 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 PPC440EPx meets the above
requirements and does not adversely affect other aspects of the system.
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PPC440EPX-NTA400E 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays
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PPC440EPX-NTA533EZ 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Tape and Reel
PPC440EPX-NTA667E 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays
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