Intel III Xeon 900 MHz 80526KY9002M Data Sheet
Product codes
80526KY9002M
PENTIUM® III XEON™ PROCESSOR AT 600 MHz to 1 GHz with 256KB L2 Cache
SIGNAL QUALITY
32
4.2.1 AGTL+ Ringback Tolerance Specifications
Table 21 provides the AGTL+ signal quality specifications for Pentium III Xeon processors at 600 MHz+ for use in
simulating signal quality at the processor core pads. Figure 12 describes the signal quality waveform for AGTL+ signals at
the processor core pads. For more information on the AGTL+ interface, see the Pentium II processor Developer's Manual
(Order Number 243341).
simulating signal quality at the processor core pads. Figure 12 describes the signal quality waveform for AGTL+ signals at
the processor core pads. For more information on the AGTL+ interface, see the Pentium II processor Developer's Manual
(Order Number 243341).
Table 21. AGTL+ Signal Groups Ringback Tolerance Specifications at the processor Core
1, 2 ,3
T#
Parameter
Min
Unit
Figure
Notes
α
:
Overshoot
100
mV
Figure 12
4,8
τ
:
Minimum Time at High
0.50
nS
Figure 12
ρ
:
Amplitude of Ringback
–200
mV
Figure 12
5,7,8
φ
:
Final Settling Voltage
200
mV
Figure 12
8
δ
:
Duration of Squarewave Ringback
N/A
nS
Figure 12
NOTES:
1.
Unless otherwise noted, all guidelines in this table apply to all Pentium III Xeon processor at 600 MHz+ frequencies and cache sizes.
2.
Specifications are for the edge rate of 0.3 – 0.8 V/nS.
3.
All values specified by design characterization.
4.
Please see Table 21 for maximum allowable overshoot.
5.
Ringback between Vref +100mV and Vref +200mV or Vref –200mV and Vref –100mV requires the flight time measurements to be
adjusted as described in the Intel® AGTL+ Specification (Pentium® II Developers Manual). Ringback below (Vref + 100mV) or above
(Vref – 100mV) is not supported.
adjusted as described in the Intel® AGTL+ Specification (Pentium® II Developers Manual). Ringback below (Vref + 100mV) or above
(Vref – 100mV) is not supported.
6.
Intel recommends not exceeding a ringback value of 2/3 V
TT
+/- 120mV to allow margin for other sources of system noise.
7.
A negative value of
ρ
indicates that the amplitude of ringback is above 2/3 V
TT.
(i.e.
ρ
= –100mV specifies the signal cannot ringback
below 2/3 V
TT +
100mV).
8.
ρ
and are
φ
measured relative to 2/3 V
TT.
α
is measured relative to
2/3 V
TT
+ 200mV
.
τ
α
ρ
φ
V start
2 / 3 V
T T
- 0 . 2
T i m e
0 0 0 9 1 4 a
C l o c k
N o t e : H i g h t o L o w c a s e i s a n a l o g o u s .
δ
1 . 2 5 V C l k R e f
2 / 3 V
T T
2 / 3 V
T T
+ 0 . 2
000914a
Figure 12. Low to High AGTL+ Receiver Ringback Tolerance
4.2.2
AGTL+ OVERSHOOT/UNDERSHOOT GUIDELINES
Overshoot guidelines based on magnitude and duration of an overshoot/undershoot pulse (illustrated in Figure 13) are
given in Table 22.
given in Table 22.
Overshoot/Undershoot is the absolute value of the maximum voltage differential across the input buffer relative to the
termination voltage (V
termination voltage (V
TT
). The overshoot/undershoot guideline limits transitions beyond VTT or VSS due to the fast signal
edge rates. The processor can be damaged by repeated Overshoot/Undershoot events on 1.5 V or 2.5 V tolerant buffers
if the potential is large enough (i.e., if the overshoot/undershoot is great enough). Determining the impact of an
overshoot/undershoot condition requires knowledge of the Magnitude, the Pulse Duration, and the Activity Factor.
if the potential is large enough (i.e., if the overshoot/undershoot is great enough). Determining the impact of an
overshoot/undershoot condition requires knowledge of the Magnitude, the Pulse Duration, and the Activity Factor.