Intel® Celeron® Processor for PGA370 up to 1.40 GHz on 0.13 µ Process
Figure 18. BCLK/BCLK#, PICCLK Generic Clock Waveform at the Processor Pins
V3
V4
V2
V1
V5
V3
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 25 provides the AGTL signal quality specifications for the processor for use in simulating
signal quality at the processor pins.
The processor maximum allowable overshoot and undershoot specifications for a given duration of
time are detailed in Table 24 through Table 26. Figure 19 shows the AGTL ringback tolerance and
Figure 20 shows the overshoot/undershoot waveform.
Table 25. AGTL Signal Groups Ringback Tolerance Specifications at the Processor Pins
1,2,3
T# Parameter
Min
Unit
Figure
Notes
4, 8
α: Overshoot
100
0.50
±200
200
mV
ns
19
19
19
19
19
τ: Minimum Time at High
ρ: Amplitude of Ringback
φ: Final Settling Voltage
mV
mV
ns
5, 6, 7, 8
8
δ: Duration of Squarewave Ringback
N/A
NOTES:
1. Unless otherwise noted, all specifications in this table apply to the processor up to 1.40 GHz frequency.
2. Specifications are for the edge rate of 0.3 – 3 V/ns. See Figure 19 for the generic waveform.
3. All values specified by design characterization.
4. See Table 24 for maximum allowable overshoot.
5. Ringback between VREF + 100 mV and VREF + 200 mV or VREF – 300 mV and VREF – 100 mVs requires the
flight time measurements to be adjusted as described in the Intel AGTL Specifications. Ringback below
VREF + 100 mV or above VREF – 100 mV is not supported.
6. Intel recommends simulations not exceed a ringback value of VREF ±200 mV to allow margin for other
sources of system noise.
7. A negative value for ρ indicates that the amplitude of ringback is above VREF. (i.e., φ = -100 mV specifies the
signal cannot ringback below VREF + 100 mV).
8. φ and ρ: are measured relative to VREF. α: is measured relative to VREF + 200 mV.
42
Datasheet
INTEL [ INTEL ]
