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參數(shù)資料
| 型號： | BX805499040 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 64-BIT, 1600 MHz, MICROPROCESSOR, CPGA611 |
| 封裝： | PGA-611 |
| 文件頁數(shù)： | 27/108頁 |
| 文件大小： | 2315K |
| 代理商： | BX805499040 |
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Dual-Core Intel Itanium Processor 9000 Series Datasheet
25
Electrical Specifications
5. Compare the specified maximum pulse duration to the signal being measured. If
the pulse duration measured is less than the pulse duration shown in the table,
then the signal meets the specifications.
6. Undershoot events must be analyzed separately from overshoot events as they are
mutually exclusive.
2.5.5
Determining if a System Meets the Overshoot/Undershoot
Specifications
The overshoot/undershoot specifications listed in Table 2-13 through Table 2-17 specify
the allowable overshoot/undershoot for a single overshoot/undershoot event. However,
most systems will have multiple overshoot and/or undershoot events that each has
their own set of parameters (duration, AF and magnitude). While each overshoot on its
own may meet the overshoot specification, the total impact of all overshoot events may
cause the system to fail. A guideline to ensure a system passes the overshoot and
undershoot specifications is shown below:
1. Ensure no signal ever exceeds VCTERM or GND.
2. If only one overshoot/undershoot event magnitude occurs, ensure it meets the
specifications listed in Table 2-13 through Table 2-17.
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.
2.5.6
Wired-OR Signals
To ensure platform compatibility between the processors, system bus signals must
meet certain overshoot and undershoot requirements. 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.
Notes: The following notes apply to Table 2-14 through Table 2-17:
1.
Absolute Maximum Overshoot magnitude of 1.65V must never be exceeded.
2.
Absolute Maximum Overshoot is measured referenced to GND. Pulse duration of overshoot is measured
relative to VCTERM.
3.
Absolute Maximum Undershoot and Pulse Duration of undershoot is measured relative to GND.
4.
Ringback below VCTERM cannot be subtracted from overshoots/undershoots.
5.
Lesser undershoot does not allocate overshoot with longer duration or greater magnitude.
6.
All values specified by design characterization.
Table 2-13. Source Synchronous AGTL+ Signal Group and Wired-OR Signal Group Absolute
Overshoot/Undershoot Tolerance
Parameter
Description
Specification
Units
VCTERM
I/O power supply voltage (nominal).
1.20
V
VMAX
Maximum absolute voltage for system bus signals at the input
of the receiver buffers.
1.65
V
VMIN
Minimum absolute voltage for system bus signals at the input
of the receiver buffers.
–0.45
V
Overshoot
Time dependent overshoot amount above VCTERM .
1
Notes:
1. These parameters cannot be specified in absolute terms.
Undershoot
Time dependent undershoot amount below GND.
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