參數(shù)資料
型號(hào)： BX80525U667256E
廠商： INTEL CORP
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 667 MHz, MICROPROCESSOR, XMA
文件頁(yè)數(shù)： 18/102頁(yè)
文件大?。?/td> 878K
代理商： BX80525U667256E
22
Datasheet
Pentium III Processor for the SC242 at 450 MHz to 800 MHz
design, the BSEL[1:0] signals must be connected to the BSEL[1:0] pins of both processors. The
Pentium III processor operates at either a 100 MHz or 133 MHz system bus frequency, but not
both. 66 MHz system bus operation is not supported.
For systems that support only a 100 MHz system bus clock, resistors on the processor cartridge
will tie the BSEL1 signal to ground (as shown in Figure 4). This signal can either be left as a no
connect or tied to ground as shown below. The BSEL0 should be pulled up to 3.3 V with a 220
resistor, and provided as a frequency driver to the clock driver/synthesizer.
On baseboards which support operation at either 100 or 133 MHz, the BSEL[1:0] signals should be
pulled up to 3.3 V with a 220
resistor (as shown in Figure 5 and Figure 6) and BSEL1 is
provided as a frequency selection signal to the clock driver/synthesizer. The BSEL0 signal can also
be incorporated into system shutdown logic on the baseboard (thus forcing the system to shutdown
as long as the BSEL0 signal is low). Figure 4 shows this routing example with a 100 MHz
Pentium III processor. Figure 5 shows the same routing example with a 133 MHz Pentium III
processor.
Table 5.
Frequency Select Truth Table for BSEL[1:0]
BSEL1
BSEL0
Frequency
0
66MHz (unsupported)
0
1
100 MHz
10
Reserved
1
133MHz
Figure 4. BSEL[1:0] Example for a 100 MHz System Design (100 MHz Processor Installed)
Processor
Core
GND
BSEL1
0
0
1
Κ
3.3
Κ
100/66#
CK100
GND
3.3V
220
BSEL0
S
C
2
4
2
Intel Pentium III Processor
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