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Datasheet
43
Intel
Pentium
III Processor with 512KB L2 Cache at 1.13GHz to 1.40GHz
3.2
AGTL Signal Quality Specifications and Measurement
Guidelines
Many scenarios have been simulated to generate a set of AGTL layout guidelines which are
available in the appropriate platform design guide. Refer to the
Intel
Pentium
II Processor
Developer's Manual
(Order Number 243502) for the AGTL buffer specification.
Table 24
provides the AGTL signal quality specifications for the processor for use in simulating
signal quality at the processor pins.
The Intel Pentium
III
processor with 512KB L2 Cache maximum allowable overshoot and
undershoot specifications for a given duration of time are detailed in
Table 23
through
Table 25
.
Figure 19
shows the AGTL ringback tolerance and
Figure 20
shows the overshoot/undershoot
waveform.
NOTES:
1. Unless otherwise noted, all specifications in this table apply to Intel Pentium III processors with 512KB L2
cache at all frequencies.
2. Specifications are for the edge rate of
0.3 - 3V/ns. S
ee
Figure 19
for the generic waveform.
3. All values specified by design characterization.
4. Please see
Table 23
for maximum allowable overshoot.
5. Ringback between V
+ 100 mV and V
+ 200 mV or V
- 300 mV and V
- 100 mVs requires the
flight time measurements to be adjusted as described in the Intel AGTL Specifications. Ringback below V
REF
+ 100 mV or above V
- 100 mV is not supported.
6. Intel recommends simulations not exceed a ringback value of V
REF
±200 mV to allow margin for other
sources of system noise.
Figure 18. BCLK/BCLK#, PICCLK Generic Clock Waveform at the Processor Pins
V2
V1
V3
V3
V4
V5
Table 24. AGTL Signal Groups Ringback Tolerance Specifications at the Processor
Pins
1, 2, 3
T# Parameter
Min
Unit
Figure
Notes
α
: Overshoot
τ
: Minimum Time at High
ρ
: Amplitude of Ringback
φ
: Final Settling Voltage
δ
: Duration of Squarewave Ringback
100
mV
19
4, 8
0.50
ns
19
±200
mV
19
5, 6, 7, 8
200
mV
19
8
N/A
ns
19