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Intel III Xeon 933 MHz 80526KB933256 Data Sheet

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80526KB933256
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PENTIUM® III XEON™ PROCESSOR AT 600 MHz to 1  GHz with 256KB L2 Cache
SIGNAL QUALITY
36
U n d e r s h o o t
O v e r s h o o t
S e t t l i n g   L i m i t
S e t t l i n g   L i m i t
R i s i n g - E d g e
R i n g b a c k
F a l l i n g - E d g e   R i n g b a c k
V
LO
V
SS
T i m e
V =
H I
V CC
2 . 5
V o l t a g e
RINGBACK
Figure 14.  Non-AGTL+ Overshoot/Undershoot, Settling Limit, and Ringback
4.3.1  2.5V Signal Overshoot/Undershoot Guidelines
The Overshoot/Undershoot guideline limits transitions beyond V CC or VSS due to fast signal edge rates. Refer to Figure
14  for an illustration of Overshoot/Undershoot specifications for non-AGTL+ signals. The processor may be damaged if
Overshoot/Undershoot specifications are not met. The Overshoot/Undershoot specification is shown in Table 23.
Table 23.  2.5V Tolerant Signal Group Overshoot/Undershoot at the Processor Core Pins
 1,2,3,4,5,6,7,8,9
Overshoot/Undershoot
Max Pulse Duration (nS)
Magnitude
AF = 0.01
AF = 0.1
AF = 1
2.3
60
16.8
1.6
2.25
60
30.4
3
2.2
60
56
5.6
2.15
60
60
8
2.1
60
60
19.2
2.05
60
60
60
2.0
60
60
60
NOTES:
1. 
Activity Factor based on period equal to 30 nS.
2. 
Overshoot/Undershoot Magnitude  = 2.3V is an Absolute value and should never be exceeded.
3. 
Overshoot is measured relative to VSS.
4. 
Undershoot is measured relative to VTT.
5. 
Overshoot/Undershoot Pulse Duration is measured relative to 1.635V.
6. 
Rinback below VTT cannot be subtracted from Overshoots/Undershoots.
7. 
Lesser Undershoot does not allocate longer or larger Overshoot.
8. 
OEM's are encouraged to follow Intel provided layout guidelines.
9. 
All values specified by design characterization.
4.3.2  BCLK Overshoot/Undershoot Guidelines and Specifications
Unlike AGTL+ or CMOS signals, BCLK Specifications do not provide for any relaxation due to activity factor.  System
designers should ensure that their platforms meet the BCLK specifications even under worst-case conditions.