參數(shù)資料
型號: BX80551PG3000FN
廠商: INTEL CORP
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 3000 MHz, MICROPROCESSOR, PBGA775
封裝: FLIP CHIP, LGA-775
文件頁數(shù): 34/106頁
文件大小: 2713K
代理商: BX80551PG3000FN
Datasheet
33
Electrical Specifications
2.7.3
Phase Lock Loop (PLL) and Filter
VCCA and VCCIOPLL are power sources required by the PLL clock generators for the Pentium D
processor. Since these PLLs are analog in nature, they require quiet power supplies for minimum
jitter. Jitter is detrimental to the system: it degrades external I/O timings as well as internal core
timings (i.e., maximum frequency). To prevent this degradation, these supplies must be low pass
filtered from VTT.
The AC low-pass requirements, with input at VTT are as follows:
< 0.2 dB gain in pass band
< 0.5 dB attenuation in pass band < 1 Hz
> 34 dB attenuation from 1 MHz to 66 MHz
> 28 dB attenuation from 66 MHz to core frequency
The filter requirements are illustrated in Figure 2-4.
Table 2-18. BSEL[2:0] Frequency Table for BCLK[1:0]
BSEL2
BSEL1
BSEL0
FSB Frequency
L
RESERVED
L
H
133 MHz
L
H
RESERVED
L
H
L
200 MHz
H
L
RESERVED
H
L
H
RESERVED
H
RESERVED
H
L
RESERVED
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