參數(shù)資料
型號(hào)： PPC440GRx-NpAfffTs
廠商： Applied Micro Circuits Corp.
英文描述： PowerPC 440GRx Embedded Processor
中文描述： 嵌入式處理器的PowerPC 440GRx
文件頁(yè)數(shù)： 72/88頁(yè)
文件大?。?/td> 603K
代理商： PPC440GRX-NPAFFFTS
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.
相關(guān)PDF資料
PDF描述
PPC440GRx-SpAfffTs PowerPC 440GRx Embedded Processor
PPC440GX-3RF800CZ Power PC 440GX Embedded Processor
PPC440GX-3CC533S Power PC 440GX Embedded Processor
PPC440GX-3CC667S Power PC 440GX Embedded Processor
PPC440GX-3CF400C Power PC 440GX Embedded Processor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PPC440GRX-NTA400E 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays
PPC440GRX-NTA400EZ 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Tape and Reel
PPC440GRX-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
PPC440GRX-NTA667EZ 制造商:AMCC 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Tape and Reel
PPC440GRX-NUA400E 制造商:AppliedMicro 功能描述:32 BIT POWERPC CORE, UP TO 667 MHZ, 2 10/100/1000 ETHERNET, - Trays
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*