Intel Pentium 4 Processor in the 478-PinPackage at 1.40 GHz, 1.50 GHz, 1.60 GHz, 1.70 GHz, 1.80 GHz, 1.90 GHz, and 2GHz

System Bus Signal Quality Specifications
44 Datasheet
Note: The following notes apply to Table 22 through Ta b l e 25 .
1. Absolute Maximum Overshoot magnitude of 2.3 V must never be exceeded.
2. Absolute Maximum Overshoot is measured relative to V
SS
, Pulse Duration of
overshoot is measured relative to V
CC
.
3. Absolute Maximum Undershoot and Pulse Duration of undershoot is measured
relative to V
CC
.
4. Ringback below V
CC
cannot be subtracted from overshoots/undershoots.
5. Lesser undershoot does not allocate longer or larger overshoot.
6. OEMs are strongly encouraged to follow Intel provided layout guidelines.
7. All values specified by design characterization.
NOTES:
1. These specifications are measured at the processor silicon.
2. BCLK period is 10 ns.
3. AF is referenced to associated source synchronous strobes.
Table 22. Source Synchronous (400 MHz) AGTL+ Signal Group Overshoot/Undershoot
Tolerance
Absolute
Maximum
Overshoot
(V)
Absolute
Maximum
Undershoot
(V)
Pulse
Duration (ns)
AF = 1
Pulse
Duration (ns)
AF = 0.1
Pulse
Duration (ns)
AF = 0.01
Notes
1,2,3
2.30 -0.585 0.06 0.63 5.00
2.25 -0.535 0.11 1.10 5.00
2.20 -0.485 0.22 2.20 5.00
2.15 -0.435 0.41 4.10 5.00
2.10 -0.385 0.75 5.00 5.00
2.05 -0.335 1.35 5.00 5.00
2.00 -0.285 2.50 5.00 5.00
1.95 -0.235 4.70 5.00 5.00
1.90 -0.185 5.00 5.00 5.00
1.85 -0.135 5.00 5.00 5.00
1.80 -0.085 5.00 5.00 5.00