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| 型號： | BX80551PG3000FN |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 3000 MHz, MICROPROCESSOR, PBGA775 |
| 封裝： | FLIP CHIP, LGA-775 |
| 文件頁數(shù)： | 32/106頁 |
| 文件大?。?/td> | 2713K |
| 代理商： | BX80551PG3000FN |
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Datasheet
31
Electrical Specifications
2.6.3.1
GTL+ Front Side Bus Specifications
In most cases, termination resistors are not required as these are integrated into the processor
silicon. See Table 2-8 for details on which GTL+ signals do not include on-die termination.
Valid high and low levels are determined by the input buffers by comparing with a reference
voltage called GTLREF. Table 2-16 lists the GTLREF specifications. The GTL+ reference voltage
(GTLREF) must be generated on the motherboard using high precision voltage divider circuits.
Table 2-14. VTTPWRGD DC Specifications
Symbol
Parameter
Min
Typ
Max
Unit
Notes
V
IL
Input Low Voltage
—
0.3
V
IH
Input High Voltage
0.9
—
V
Table 2-15. BOOTSELECT and MSID[1:0] DC Specifications
Symbol
Parameter
Min
Typ
Max
Unit
Notes
V
IL
Input Low Voltage
—
0.24
V
1
NOTES:
1.
These parameters are not tested and are based on design simulations.
V
IH
Input High Voltage
0.96
—
V
-
Table 2-16. GTL+ Bus Voltage Definitions
Symbol
Parameter
Min
Typ
Max
Units
Notes1
NOTES:
1.
Unless otherwise noted, all specifications in this table apply to all processor frequencies.
GTLREF_PU
GTLREF pull up resistor
124 * 0.99
124
124 * 1.01
Ω
2
2.
GTLREF is to be generated from VTT by a voltage divider of 1% resistors (one divider for each GTLREF land).
GTLREF_PD
GTLREF pull down resistor
210 * 0.99
210
210 * 1.01
Ω
R
PULLUP
On die pullup for
BOOTSELECT signal
500
-
5000
Ω
3
3.
These pull-ups are to VTT.
R
TT
60
Ω Platform Termination
Resistance
41
50
58
Ω
4
4.
R
TT is the on-die termination resistance measured at V
TT/2 of the GTL+ output driver. The IMPSEL pin is used to select a
50
Ω or 60Ω buffer and R
TT value.
50
Ω Platform Termination
Resistance
37
45
52
Ω
COMP[1:0]
60
Ω Platform COMP
Resistance
59.8
60.4
61
Ω
5
5.
COMP resistance must be provided on the system board with 1% resistors. COMP[1:0] resistors are to VSS. COMP[3:2]
resistors are to VSS.
50
Ω Platform COMP
Resistance
49.9 * 0.99
49.9
49.9 * 1.01
Ω
COMP[3:2]
60
Ω Platform COMP
Resistance
59.8
60.4
61
Ω
50
Ω Platform COMP
Resistance
49.9 * 0.99
49.9
49.9 * 1.01
Ω
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