參數(shù)資料
型號: celeron 700
廠商: Intel Corp.
英文描述: Intel Celeron Processor Up To 700 MHz(頻率達(dá)700MHz的INTEL Celeron 處理器)
中文描述: 英特爾賽揚處理器高達(dá)700兆赫(頻率達(dá)700MHz的英特爾賽揚處理器的)
文件頁數(shù): 53/118頁
文件大?。?/td> 990K
代理商: CELERON 700
Datasheet
53
Intel
Celeron Processor up to 700 MHz
3.4.5
Reading Overshoot/Undershoot Specification Tables (FC-PGA
Package)
The overshoot/undershoot specification for the FC-PGA package processor is not a simple single
value. Instead, many factors are needed to determine the over/undershoot specification. In addition
to the magnitude of the overshoot, the following parameters must also be known: the junction
temperature the processor will be operating, the width of the overshoot (as measured above
1.635 V) and the Activity Factor (AF). To determine the allowed overshoot for a particular
overshoot event, the following must be done:
1. Determine the signal group that particular signal falls into. If the signal is an AGTL+ signal
operating with a 66 MHz system bus, use
Table 34
(66 MHz AGTL+ signal group). If the
signal is a CMOS signal, use
Table 35
(33 MHz CMOS signal group).
2. Determine the maximum junction temperature (Tj) for the range of processors that the system
will support (80
o
C or 90
o
C).
3. Determine the Magnitude of the overshoot (relative to Vss)
4. Determine the Activity Factor (how often does this overshoot occur)
5. From the appropriate Specification table, read off the Maximum Pulse Duration (in ns)
allowed.
6. Compare the specified Maximum Pulse Duration to the signal being measured. If the Pulse
Duration measured is less than the Pulse Duration shown in the table, then the signal meets the
specifications.
The above procedure is similar for undershoots after the undershoot waveform has been converted
to look like an overshoot. Undershoot events must be analyzed separately from Overshoot events
as they are mutually exclusive.
Table 33
shows an example of how the maximum pulse duration is determined for a given
waveform.
NOTES:
1. Corresponding Maximum Pulse Duration Specification - 3.2 ns
2. Pulse Duration (measured) - 2.0 ns
Given the above parameters, and using
Table 34
(90
o
C/AF=0.1 column) the maximum allowed
pulse duration is 3.2 ns. Since the measured pulse duration is 2.0ns, this particular overshoot event
passes the overshoot specifications, although this doesn’t guarantee that the combined overshoot/
undershoot events meet the specifications.
Table 33. Example Platform Information
Required Information
Maximum Platform Support
Notes
FSB Signal Group
66 MHz AGTL+
Max Tj
90 °C
Overshoot Magnitude
2.13V
Measured Value
Activity Factor (AF)
0.1
Measured overshoot occurs on
average every 20 clocks
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