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参数资料
| 型号： | BX80525U500512E |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 500 MHz, MICROPROCESSOR, XMA |
| 文件页数： | 13/94页 |
| 文件大小： | 898K |
| 代理商： | BX80525U500512E |
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Pentium
III Processor at 450 MHz, 500 MHz, 533B MHz, 550 MHz, 600/600B MHz
20
Datasheet
2.8.2
System Bus Frequency Select Signal (BSEL0)
The BSEL[1:0] signals (BSEL0 is also known as 100/66#) are used to select the system bus
frequency for the Pentium III processor(s). Table 5 defines the possible combinations of the signals
and the frequency associated with each combination. The frequency is determined by the
processor(s), and frequency synthesizer. All system bus agents must operate at the same core and
system bus frequency in a 2-way MP Pentium III processor configuration. In a 2-way MP system
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 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 3.3V with a 220
resistor, and provided as a frequency driver to the clock driver/synthesizer (see the CK98 Clock
Synthesizer Design Guidelines for more details).
On baseboards which support operation at either 100 or 133 MHz, the BSEL[1:0] signals should be
pulled up to 3.3V with a 220
resistor (as shown in Figure 5 and Figure 6 below) and BSEL1 is
provided as a frequency selection signal to the clock driver/synthesizer (see the CK98 Clock
Synthesizer Design Guidelines for more details). 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 5 shows this routing example with a 100 MHz Pentium III processor.
Figure 6 shows the same routing example with a 133 MHz Pentium III processor.
Table 5.
Frequency Select Truth Table for BSEL[1:0]
Figure 4.
BSEL[1:0] Example for a 100MHz System Design (100MHz Processor Installed)
BSEL1
BSEL0
Frequency
00
66MHz
(unsupported)
0
1
100 MHz
10
Reserved
1
133MHz
CK100
S
L
O
T
1
Processor
Core
GND
Pentium III Processor
1 K
S
C
2
4
2
BSEL0
100/66#
GND
3.3 Volts
220
3.3 K
BSEL1
GND
0
0
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