Intel Pentium III Processor/840, Руководство пользователя, Страница: 55 / 151

Intel
®
Pentium
®
III Processor/840 Development Kit Manual 4-19
Hardware Reference
4.10.3 Processor System Bus Select (J2L1, J2K1)
These two jumpers work together to select the processor system bus frequency. A 133 MHz
processor side bus frequency is selected by default (J2L1 OUT and J2K1 OUT).
Caution: You will only need to change the default setting if you are replacing the processors provided in the
kit with processors that use a 100 MHz processor system bus. Before changing these settings, read
Appendix A, “Using Different Processors in the Board.” Setting this jumper incorrectly could
damage the evaluation board or the processors.
4.10.4 PSMI P0 (J3J2), PSMI P1 (J3K2) (Not used)
This jumper controls the processor SMI configuration. By default, the processors’ SMIs are
enabled.
4.10.5 In Order Queue (J6R2)
If this jumper is installed, the In Order Queue (IOQ) is set to 1. Otherwise the IOQ is set to 8.
4.10.6 82559 Ethernet Controller Enable (J2F1)
This jumper is used to enable/disable the 82559ER LAN Controller. By default, this jumper is set
to 1-2 to enable the 82559ER.
4.10.7 Reserved Jumper (J7F1)
Reserved. Do not change the default setting.
4.10.8 Second WD Timeout (J8F1)
If enabled, the ICH resets the CPU after the TCO times out, if an instruction is not fetched after
reset.
4.10.9 CMOS (J6F1)
This jumper controls the power to the battery backed-up CMOS RAM. This RAM stores system
information required by the BIOS during startup. For normal operation, short pins 1 and 2. To clear
the CMOS RAM, perform the following steps:
1. Remove power from the board by pushing the power switch (S11R1).
2. Move J6F1 to the 2-3 position.
3. Disconnect the power supply (J3M1, J3P1, J1T4).
4. Move J6F1 back to the 1-2 position.
5. Reconnect the power supply (J3M1, J3P1, J1T4).
6. Boot the system and enter the BIOS setup screen to reconfigure the system.