Intel G465 BX80623G465 Manual Do Utilizador
Códigos do produto
BX80623G465
Intel
®
Celeron
®
Processor on 0.13 Micron Process in the 478-Pin Package Datasheet
47
System Bus Signal Quality Specifications
3.3.6
Conformance Determination to Overshoot/Undershoot
Specifications
Specifications
The overshoot/undershoot specifications listed in the following tables specify the allowable
overshoot/undershoot for a single overshoot/undershoot event. However, most systems will have
multiple overshoot and/or undershoot events, and each has its own set of parameters (duration, AF
and magnitude). While each overshoot on its own may meet the overshoot specification, when you
add the total impact of all overshoot events, the system may fail. The following are guidelines to
ensure that a system passes the overshoot and undershoot specifications:
overshoot/undershoot for a single overshoot/undershoot event. However, most systems will have
multiple overshoot and/or undershoot events, and each has its own set of parameters (duration, AF
and magnitude). While each overshoot on its own may meet the overshoot specification, when you
add the total impact of all overshoot events, the system may fail. The following are guidelines to
ensure that a system passes the overshoot and undershoot specifications:
1. Ensure no signal ever exceeds VCC or –0.25 V
– OR –
2. If only one overshoot/undershoot event magnitude occurs, ensure it meets the over/undershoot
specifications in the following tables
– OR –
– OR –
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.
these worst case overshoot or undershoot events meet the specifications
(measured time < specifications) in the table (where AF=1), then the system passes.
through
.
1. Absolute Maximum Overshoot magnitude of 1.80 V must never be exceeded.
2. Absolute Maximum Overshoot is measured relative to VSS, and Pulse Duration of overshoot
is measured relative to VCC.
3. Absolute Maximum Undershoot and Pulse Duration of undershoot is measured relative to
VSS.
4. Ringback below VCC can not be subtracted from overshoots/undershoots.
Lesser undershoot does not allocate longer or larger overshoot.
5. OEMs are strongly encouraged to follow the Intel provided layout guidelines.
6. All values are specified by design characterization.
Table 26. 1.525V VID 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
NOTES:
1.
These specifications are measured at the processor core silicon.
2.
BCLK period is 10 ns.
1.800
–0.310
0.01
0.15
1.59
1.750
–0.260
0.01
0.43
4.59
1.700
–0.210
0.02
1.22
5.00
1.650
–0.160
0.05
3.56
5.00
1.600
–0.110
0.14
5.00
5.00
1.550
–0.06
0.63
5.00
5.00