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參數(shù)資料
| 型號： | BX80557E2140 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROPROCESSOR, PBGA775 |
| 封裝： | LGA-775 |
| 文件頁數(shù)： | 23/107頁 |
| 文件大?。?/td> | 1474K |
| 代理商： | BX80557E2140 |
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Electrical Specifications
22
Datasheet
NOTES:
1.
VOS is measured overshoot voltage.
2.
TOS is measured time duration above VID.
2.6.4
Die Voltage Validation
Overshoot events on processor must meet the specifications in Table 7 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.
2.7
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) which 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 14 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
Example Overshoot Waveform
0
5
10
15
20
25
Time [us]
Volta
g
e
[V]
VID - 0.000
VID + 0.050
VOS
TOS
TOS: Overshoot time above VID
VOS: Overshoot above VID
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