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| 型号： | IBM25PPC750FX-GB0112T |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 600 MHz, RISC PROCESSOR, CBGA292 |
| 封装： | 21 X 21 MM, 1 MM PITCH, CERAMIC, BGA-292 |
| 文件页数： | 8/62页 |
| 文件大小： | 452K |
| 代理商： | IBM25PPC750FX-GB0112T |
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DD 2.X
PowerPC 750FX RISC Microprocessor
Preliminary
3. Electrical and Thermal Characteristics
Page 14 of 63
Body_750FX_DS_DD2.X.fm.2.0
June 9, 2003
3.3 Spread Spectrum Clock Generator (SSCG)
When designing with the SSCG, there are a number of design issues that must be taken into account.
SSCG creates a controlled amount of long-term jitter. In order for a receiving PLL in the 750FX to operate in
this environment, it must be able to accurately track the SSCG clock jitter.
The accuracy to which the 750FX PLL can track the SSCG clock is referred to as tracking skew. When
performing system timing analysis, the tracking skew must be added or subtracted to the I/O timing specifica-
tions because the tracking skew appears as a static phase error between the internal PLL and the SSCG
clock.
To minimize the impact on I/O timings the following SSCG configuration is recommended:
The following SSCG configuration is recommended:
- Down spread mode, less than or equal to 1% of the maximum frequency
- A modulation frequency of 30kHz
- Linear sweep modulation or “Hershey Kiss
1” (as in a Lexmark2 prole) modulation prole as shown in
In this configuration the tracking skew is less than 100ps.
1. Hershey Kiss is a trademark of Hershey Foods Corporation.
2. See patent 5,631,920.
Figure 3-2. Linear Sweep Modulation Prole
Down spread
frequency
change
0%
-1%
0
s
Time Increases
Percentage
Decreases
33.3
s
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| IBM25PPC750FX-DB0513T | 32-BIT, 700 MHz, RISC PROCESSOR, CBGA292 |
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| IBM25PPC750FX-FB0112T | 32-BIT, 600 MHz, RISC PROCESSOR, CBGA292 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IBM25PPC750FX-GB0122V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
| IBM25PPC750FX-GB0132T | 制造商:IC'S/TRANSISTORS/DIO 功能描述: 制造商:IC'S/TRANSISTORS/DIODES 功能描述: |
| IBM25PPC750FX-GB0132V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
| IBM25PPC750FX-GB0133V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
| IBM25PPC750FX-GB0532V | 制造商:IBM 功能描述:MPU 750XX RISC 32BIT - Trays |
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