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參數(shù)資料
| 型號： | BX80524R300128 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 300 MHz, MICROPROCESSOR, XMA |
| 封裝： | SINGLE EDGE PROCESSOR PACKAGE |
| 文件頁數(shù)： | 45/130頁 |
| 文件大?。?/td> | 2654K |
| 代理商： | BX80524R300128 |
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Datasheet
21
Intel Celeron Processor up to 1.10 GHz
2.6
System Bus Unused Pins
All RESERVED pins must remain unconnected. Connection of these pins to VCCCORE, VSS, or to
any other signal (including each other) can result in component malfunction or incompatibility
with future Celeron processor products. See Section 5.0 for a pin listing of the processor and the
location of each RESERVED pin.
For Intel Celeron processors in the S.E.P. Package, the TESTHI pin must be at a logic-high level
when the core power supply comes up. For more information, please refer to erratum C26 of the
Intel
Celeron Processor Specification Update (Order Number 243748). Also note that the
TESTHI signal is not available on Intel Celeron processors in the PGA package.
PICCLK must be driven with a valid clock input and the PICD[1:0] lines must be pulled-up to
2.5 V even when the APIC will not be used. A separate pull-up resistor must be provided for each
PICD line.
For reliable operation, always connect unused inputs or bi-directional signals to their deasserted
signal level. The pull-up or pull-down resistor value is system dependent and should be chosen
such that the logic-high (VIH) and logic-low (VIL) requirements are met.
For the S.E.P. Package, unused AGTL+ inputs should not be connected as the package substrate has
termination resistors. On the other hand, the PGA packages do not have AGTL+ termination in
their package and must have any unused AGTL+ inputs terminated through a pull-up resistor. For
designs that intend to only support the FC-PGA/FC-PGA2 processors, unused AGTL+ inputs will
be terminated by the processor’s on-die termination resistors and, thus, do not need to be
terminated on the motherboard. However, the reset pin should always be terminated on the
motherboard.
For unused CMOS inputs, active-low signals should be connected through a pull-up resistor to
meet VIH requirements and active-high signals should be connected through a pull-down resistor to
meet VIL requirements. Unused CMOS outputs can be left unconnected. A resistor must be used
when tying bi-directional signals to power or ground. For any signal pulled to either power or
ground, a resistor will allow for system testability.
2.7
Processor System Bus Signal Groups
To simplify the following discussion, the Celeron processor system bus signals have been
combined into groups by buffer type. All Celeron processor system bus outputs are open drain
and require a high-level source provided externally by the termination or pull-up resistor.
AGTL+ input signals have differential input buffers, which use VREF as a reference signal. AGTL+
output signals require termination to 1.5 V. In this document, the term "AGTL+ Input" refers to the
AGTL+ input group as well as the AGTL+ I/O group when receiving. Similarly, "AGTL+ Output"
refers to the AGTL+ output group as well as the AGTL+ I/O group when driving.
EMI pins (S.E.P. Package only) should be connected to motherboard ground and/or to chassis
ground through zero ohm (0
) resistors. The zero ohm resistors should be placed in close
proximity to the SC242 connector. The path to chassis ground should be short in length and have a
low impedance.
The PWRGOOD, BCLK, and PICCLK inputs can each be driven from ground to 2.5 V. Other
CMOS inputs (A20M#, IGNNE#, INIT#, LINT0/INTR, LINT1/NMI, PREQ#, SMI, SLP#, and
STPCLK#) must be pulled up to VCCCMOS. In addition, the CMOS, APIC, and TAP outputs are
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