参数资料
型号: EWIXP455ABT
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 266 MHz, RISC PROCESSOR, PBGA544
封装: LEAD FREE, PLASTIC, BGA-544
文件页数: 33/163页
文件大小: 1123K
代理商: EWIXP455ABT
Electrical Specifications
May 2005
Intel IXP45X and Intel IXP46X Product Line of Network Processors Datasheet
128
Document Number: 306261-002
5.6.1.2
PCI Clock Timings
Table 48.
Processors’ Clock Timings Spread Spectrum Parameters
Spread-Spectrum
Conditions
Min
Max
Notes
Frequency deviation from
33.33 MHz as a percentage
-2.0%
+0.0%
Characterized and guaranteed by design, but not
tested. Do not over-clock the PLL input. The A.C.
timings will not be guaranteed if the device exceeds
33.33 MHz.
Modulation Frequency
50 KHz
Characterized and guaranteed by design, but not
tested
NOTES:
1. It is important to note that when using spread spectrum clocking, other clocks in the system will change
frequency over a specific range. This change in other clocks can present some system level limitations.
Please refer to the application note titled Spread Spectrum Clocking to Reduce EMI Application Note,
when designing a product that utilizes spread spectrum clocking.
Figure 16.
Typical Connection to an Oscillator
Table 49.
PCI Clock Timings
Symbol
Parameter
33 MHZ
66 MHZ
Units
Notes
Min.
Max.
Min.
Max.
TPERIODPCICLK Clock period for PCI Clock
30
15
ns
TCLKHIGH
PCI Clock high time
11
6
ns
TCLKLOW
PCI Clock low time
11
6
ns
TSLEW RATE
Slew Rate requirements for
PCI Clock
1
4
1.5
4
V/ns
In te l IX P 4 5 X / IX P 4 6 X
N e tw ork P roc es s o rs
O s c illator
OS C _ IN
OS C _ OU T
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