Intel Itanium 2 Processor manual Wired-OR Signals

Electrical Specifications

Table 2-17. Itanium® 2 Processors (1.66 GHz) Source Synchronous AGTL+ Signal Group Time-Dependent Overshoot/Undershoot Tolerance for 667 MHz System Bus

Absolute				Pulse Duration (ns)
Maximum (V)
Over-	Under-	AF = 11	AF = 0.75	AF = 0.5	AF = 0.25	AF = 0.1	AF = 0.05	AF = 0.01
shoot	shoot
1.8	–0.6	0.0050	0.0054	0.0086	0.0172	0.0423	0.0858	0.4297
1.75	–0.55	0.0129	0.0172	0.0258	0.0517	0.1292	0.2585	1.2953
1.7	–0.5	0.0387	0.0516	0.0775	0.1553	0.3882	0.7748	1.5
1.65	–0.45	0.1158	0.1544	0.2311	0.4629	1.1564	1.5	1.5
1.6	–0.4	0.3429	0.4562	0.6845	1.3728	1.5	1.5	1.5
1.55	–0.35	1.0065	1.3411	1.5	1.5	1.5	1.5	1.5
1.5	–0.3	1.5	1.5	1.5	1.5	1.5	1.5	1.5
1.45	–0.25	1.5	1.5	1.5	1.5	1.5	1.5	1.5

NOTES:

1. Activity Factor = 1 means signal toggles every 3 ns.

2.5.6Wired-OR Signals

System bus signals must meet certain overshoot and undershoot requirements. The maximum absolute overshoot voltage is 1.8V and the minimum absolute undershoot voltage is

–0.6V. The system bus wired-OR signals (BINIT#, HIT#, HITM#, BNR#, TND#, BERR#) have the same absolute overshoot and undershoot specification as the Source Synchronous AGTL+ Signals, but they have different time dependent overshoot/undershoot requirements. Please refer to Table 2-18through Table 2-21for the wired-OR time dependant overshoot/undershoot limits.

Table 2-18. Itanium® 2 Processors (900 MHz, 1.0 GHz, 1.3 GHz, 1.4 GHz, 1.5 GHz/6 MB) Wired- OR Signal Group (BINIT#, HIT#, HITM#, BNR#, TND#, BERR#)1 Overshoot/Undershoot Tolerance for 400 MHz System Bus

Absolute				Pulse Duration (ns)
Maximum (V)
Over-	Under-	AF = 12	AF = 0.75	AF = 0.5	AF = 0.25	AF = 0.1	AF = 0.05	AF = 0.01
shoot	shoot
1.8	–0.6	0.0493	0.06576	0.0985	0.1968	0.4923	0.9852	4.9228
1.75	–0.55	0.1485	0.1977	0.2966	0.5933	1.4834	2.9659	5
1.7	–0.5	0.4444	0.5932	0.8898	1.7798	4.4448	5	5
1.65	–0.45	1.3290	1.7670	2.6529	5	5	5	5
1.6	–0.4	3.9270	5	5	5	5	5	5
1.55	–0.35	5	5	5	5	5	5	5
1.5	–0.3	5	5	5	5	5	5	5

NOTES:

1.Wired-OR signals operate at 200 MHz.

2.Activity factor = 1 means signal toggles every 10ns.

28 Datasheet