参数资料
型号: BX80552360
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 3460 MHz, MICROPROCESSOR, CBGA775
封装: LGA-775
文件页数: 15/96页
文件大小: 1975K
代理商: BX80552360
Electrical Specifications
22
Datasheet
NOTES:
1.
VOS is measured overshoot voltage.
2.
TOS is measured time duration above VID.
2.5.4
Die Voltage Validation
Overshoot events on processor must meet the specifications in Table 6 when measured
across the VCC_SENSE and VSS_SENSE lands. Overshoot events that are < 10 ns in
duration may be ignored. These measurements of processor die level overshoot must
be taken with a bandwidth limited oscilloscope set to a greater than or equal to
100 MHz bandwidth limit.
2.6
Signaling Specifications
Most processor Front Side Bus signals use Gunning Transceiver Logic (GTL+) signaling
technology. This technology provides improved noise margins and reduced ringing
through low voltage swings and controlled edge rates. Platforms implement a
termination voltage level for GTL+ signals defined as VTT. Because platforms implement
separate power planes for each processor (and chipset), separate VCC and VTT supplies
are necessary. This configuration allows for improved noise tolerance as processor
frequency increases. Speed enhancements to data and address busses have caused
signal integrity considerations and platform design methods to become even more
critical than with previous processor families.
The GTL+ inputs require a reference voltage (GTLREF) that is used by the receivers to
determine if a signal is a logical 0 or a logical 1. GTLREF must be generated on the
motherboard (see Table 16 for GTLREF specifications). Termination resistors (RTT) for
GTL+ signals are provided on the processor silicon and are terminated to VTT. Intel
chipsets will also provide on-die termination, thus eliminating the need to terminate the
bus on the motherboard for most GTL+ signals.
Figure 2.
VCC Overshoot Example Waveform
Time
Example Overshoot Waveform
Vo
lt
ag
e
(V
)
VID
VID + 0.050
T
OS
V
OS
T
OS: Overshoot time above VID
V
OS: Overshoot above VID
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