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| 型號： | pentium II processor |
| 廠商： | Intel Corp. |
| 英文描述： | 32 bit processor AT 233MHZ，266MHZ，300MHZ and 333MHZ(工作頻率233，266，300和333兆赫茲32位處理器) |
| 中文描述： | 32位處理器，233MHZ，266MHz的的300MHz和333MHz的（工作頻率23326.63萬和333兆赫茲32位處理器） |
| 文件頁數(shù)： | 39/94頁 |
| 文件大小： | 892K |
| 代理商： | PENTIUM II PROCESSOR |
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E
PENTIUM II PROCESSOR AT 233 MHZ, 266 MHZ, 300 MHZ, AND 333 MHZ
39
3.2.
GTL+ Signal Quality
Specifications
Table 18 and Figure 16 describe the GTL+ signal
quality specifications for the Pentium II processor.
For more information on the GTL+ interface, see the
Pentium
II Processor Developer’s Manual(Order
Number 243341).
3.3.
Non-GTL+ Signal Quality
Specifications
Signals driven on the Pentium II processor System
Bus should meet signal quality specifications to
ensure that the components read data properly and
that incoming signals do not affect the long term
reliability of the component. There are three signal
quality parameters defined: Overshoot/Undershoot,
Ringback and Settling Limit. All three signal quality
parameters are shown in Figure 17 for non-GTL+
signal groups.
3.3.1.
OVERSHOOT/UNDERSHOOT
GUIDELINES
Overshoot (or undershoot) is the absolute value of
the maximum voltage above the nominal high voltage
or below V
SS
. The overshoot/undershoot guideline
limits transitions beyond V
CC
or V
SS
due to the fast
signal edge rates. (See Figure 17 for non-GTL+
signals.) The processor can be damaged by
repeated overshoot events on 2.5 V tolerant buffers if
the charge is large enough (i.e., if the overshoot is
great enough). However, excessive ringback is the
dominant detrimental system timing effect resulting
from
overshoot/undershoot
overshoot/undershoot guideline will make satisfying
the ringback specification difficult).
The overshoot/
undershoot guideline is 0.8 V
and assumes the
absence of diodes on the input. These guidelines
should be verified in simulations
without the on-
chip ESD protection diodes present
because the
diodes will begin clamping the 2.5 V tolerant signals
beginning at approximately 1.25 V above Vcc
CORE
and 0.5 V below V
SS
. If signals are not reaching the
clamping voltage, this will not be an issue. A system
should not rely on the diodes for overshoot/
undershoot protection as this will negatively affect
the life of the components and make meeting the
ringback specification very difficult.
(i.e.,
violating
the
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