Source Synchronous Agtl+ Signal Group And Wired-Or Signal Group Absolute Overshoot/Undershoot Tolerance; Synchronous Agtl+ Signal Group Time-Dependent Overshoot/Undershoot Tolerance For 400 Mhz System Bus - Intel Itanium 2 Processor Datasheet
2 processor 1.66 ghz with 9 mb l3 cache / 1.66 ghz with 6 mb l3 cache / 1.6 ghz with 9 mb l3 cache / 1.6 ghz with 6 mb l3 cache/ 1.5 ghz with 6 mb l3 cache / 1.5 ghz with 4 mb l3 cache / 1.4 ghz with 4 mb l3 cache / 1.3 ghz with 3 mb l3 cache / 1.0 ghz wi
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Electrical Specifications
3. If multiple overshoots and/or multiple undershoots occur, measure the worst-case pulse
duration for each magnitude and compare the results against the AF = 1 specifications. If all of
these worst-case overshoot or undershoot events meet the specifications (measured time <
specifications) in the table (where AF = 1), then the system passes.
Table 2-13. Source Synchronous AGTL+ Signal Group and Wired-OR Signal Group Absolute
Overshoot/Undershoot Tolerance
Parameter
V
CTERM
V
MAX
V
MIN
Overshoot
Undershoot
NOTES:
1. These parameters cannot be specified in absolute terms.
NOTES: The following notes apply to
1. Absolute Maximum Overshoot magnitude of 1.8V must never be exceeded.
2. Absolute Maximum Overshoot is measured referenced to GND. Pulse duration of overshoot is measured
relative to V
3. Absolute Maximum Undershoot and Pulse Duration of undershoot is measured relative to V
4. Ringback below V
5. Lesser undershoot does not allocate overshoot with longer duration or greater magnitude.
6. All values specified by design characterization.
Table 2-14. Itanium
Synchronous AGTL+ Signal Group Time Dependent Overshoot/Undershoot
Tolerance for 400 MHz System Bus
Absolute
Maximum (V)
Over-
shoot
1.8
1.75
1.7
1.65
1.6
1.55
1.5
1.45
NOTES:
1. Activity factor = 1 means signal toggles every 5 ns.
26
I/O power supply voltage (nominal).
Maximum absolute voltage for system bus signals at the input
of the receiver buffers.
Minimum absolute voltage for system bus signals at the input of
the receiver buffers.
Time dependent overshoot amount above V
Time dependent undershoot amount below GND.
Table 2-14
.
CTERM
cannot be subtracted from overshoots/undershoots.
CTERM
®
2 Processors (900 MHz, 1.0 GHz, 1.3 GHz, 1.4 GHz, 1.5 GHz/6 MB) Source
Under-
1
AF = 1
AF = 0.75
shoot
–0.6
0.0083
0.0089
–0.55
0.0206
0.0276
–0.5
0.0621
0.0828
–0.45
0.1851
0.2470
–0.4
0.5477
0.7296
–0.35
1.6100
2.1451
–0.3
2.5
2.5
–0.25
2.5
2.5
Description
CTERM .
through
Table
2-21:
Pulse Duration (ns)
AF = 0.5
AF = 0.25
0.0137
0.02750
0.0413
0.0827
0.1239
0.2480
0.3702
0.7392
1.0972
2.1915
2.5
2.5
2.5
2.5
2.5
2.5
Specification
1.20
1.80
–0.60
1
1
.
CTERM
AF = 0.1
AF = 0.05
AF = 0.01
0.0688
0.1376
0.6863
0.2067
0.4139
2.0680
0.6207
1.2420
1.8500
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
Datasheet
Units
V
V
V
2.5
2.5
2.5
2.5
2.5
2.5
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