参数资料
型号: RN80532KC0412M
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 2000 MHz, MICROPROCESSOR, CPGA603
封装: Interposer, Micro, PGA-603
文件页数: 80/132页
文件大小: 2316K
代理商: RN80532KC0412M
Intel Xeon Processor MP with up to 2MB L3 Cache
3-5
System Bus Signal Quality Specifications
3.3
System Bus Signal Quality Specifications and
Measurement Guidelines
3.3.1
Overshoot/Undershoot Guidelines
Overshoot (or undershoot) is the absolute value of the maximum voltage above or below V
SS. The
overshoot/undershoot specifications limit transitions beyond V
CC or VSS due to the fast signal edge
rates. The processor can be damaged by single and/or repeated overshoot or undershoot events on
any input, output, or I/O buffer if the charge is large enough (i.e., if the over/undershoot is great
enough). Determining the impact of an overshoot/undershoot condition requires knowledge of the
magnitude, the pulse direction, and the activity factor (AF). Permanent damage to the processor is
the likely result of excessive overshoot/undershoot.
When performing simulations to determine impact of overshoot and undershoot, ESD diodes must
be properly characterized. ESD protection diodes do not act as voltage clamps and will not provide
overshoot or undershoot protection. ESD diodes modelled within Intel I/O buffer models do not
clamp undershoot or overshoot and will yield correct simulation results. If other I/O buffer models
are being used to characterize the Intel Xeon processor MP on the 0.13 micron process processor
Figure 24. High-to-Low System Bus Receiver Ringback Tolerance for PWRGOOD and TAP
Buffers
0.5 * Vcc
Vt+ (min)
Vt- (max)
Vcc
Vss
Vt- (min)
Threshold Region to switch
receiver to a logic 0.
Allowable Ringback
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