User`s guide

prevent any damage to the processor as a result of overheating. The THERMTRIP# signal activation is completely independent from processor

activity and therefore does not produce any bus cycles.

Note

In order for THERMTRIP# to be able to automatically switch off the system it is necessary to use an ATX style power supply.

Processor Performance Control6.3.2

Note

The following information is provided for a better understanding about Intel

’s processor performance control capabilities when using Intel

Pentium M processors. The conga-B915 is not equipped with Pentium M processors. It features Celeron M processors.

Intel

Pentium M processors run at different voltage/frequency states (performance states), which is referred to as Enhanced Intel

SpeedStep

technology (EIST). Operating systems that support performance control take advantage of microprocessors that use several different

performance states in order to efciently operate the processor when it’s not being fully utilized. The operating system will determine the

necessary performance state that the processor should run at so that the optimal balance between performance and power consumption can

be achieved during runtime.

The Windows family of operating systems links its processor performance control policy to the power scheme setting found in the control panel

option applet.

Note

If the “Home/Ofce” or “Always On” power scheme is selected when using Windows operating systems then the processor will always run at the

highest performance state. For more information about this subject see chapter 8 of the ACPI Specication Revision 2.0c, which can be found

at www.acpi.info . Also visit Microsoft’s website and search for the document called “Windows Native Processor Performance Control”.

The congatec BIOS allows you to limit the maximum processor frequency. This can be useful if the maximum performance is not required or if

the maximum processor performance state dissipates too much power and heat.

In the ‘CPU Conguration’ submenu of the ‘BIOS Setup Program’ you’ll nd the node for ‘Max. Frequency’ limitation. For each Intel

Pentium M

processor the BIOS lists the supported frequencies. If a lower frequency than the maximum one is selected, the processor will never run at

frequencies above this setting.

Celeron M processors do not support Enhanced Intel

SpeedStep

technology. They always run at a xed frequency. In order to limit the

performance and power consumption of Celeron M processors, the congatec BIOS offers ‘On-Demand Clock Modulation’ support in the

‘CPU Conguration’ submenu of the ‘BIOS Setup Program’. When ‘On-Demand Clock Modulation’ is enabled, the processor clock is throttled

using the duty cycle determined in setup. Keep in mind that the ‘On-Demand’ clock modulation duty cycle indicates that the clock on to clock