參數(shù)資料
型號(hào): BX805499040
廠(chǎng)商: INTEL CORP
元件分類(lèi): 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(yè)數(shù): 25/108頁(yè)
文件大小: 2315K
代理商: BX805499040
Dual-Core Intel Itanium Processor 9000 Series Datasheet
23
Electrical Specifications
2.5
System Bus Signal Quality Specifications and
Measurement Guidelines
Overshoot (or undershoot) is the absolute value of the maximum voltage above the
nominal VCTERM voltage (or below GND), as shown in Table 2-3. The overshoot/
undershoot specifications limit transitions beyond VCTERM or GND due to the fast signal
edge rates. The processor can be permanently damaged by repeated overshoot or
undershoot events on any input, output, or I/O buffer if the charge is large enough
(that is, if the overshoot/undershoot is great enough). Determining the impact of an
overshoot/undershoot condition requires knowledge of the magnitude, the pulse
duration, and the activity factor (AF).
2.5.1
Overshoot/Undershoot Magnitude
Magnitude describes the maximum potential difference between a signal and its voltage
reference level. For the processor, both are referenced to GND as shown in Figure 2-3.
It is important to note that overshoot and undershoot conditions are separate and their
impact must be determined independently. Overshoot/undershoot magnitude levels
must observe the absolute maximum specifications listed in Table 2-13 through
Table 2-17. These specifications must not be violated at any time regardless of bus
activity or system state. Within these specifications are threshold levels that define
different allowed pulse duration. Provided that the magnitude of the overshoot/
undershoot is within the absolute maximum specifications, the pulse magnitude,
duration and activity factor must all be used to determine if the overshoot/undershoot
pulse is within specifications.
Figure 2-3. System Bus Signal Waveform Exhibiting Overshoot/Undershoot
000588
V
CTERM
Maximum
Absolute
Overshoot
Maximum
Absolute
Undershoot
Time-dependent
Overshoot
Time-dependent
Undershoot
V
REF
V
OL
GND
V
MIN
V
MAX
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