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cPCI-MXS64GX Technical Reference Manual
The temperature management consists in reducing the CPU clock speed throttling when the
temperature goes over the high limit (overheating condition) and suspending the throttling
operation as soon as the temperature returns under the low temperature limit (normal
condition).
The clock speed may be throttled by a CPU overheating due to the fan failure. In such a
case, the temperature control is triggered as soon as the temperature reaches the high
temperature limit of the die.
The ambient temperature of the CPU generally raises up due to an augmentation of the
temperature in the casing. In that case, the clock speed will be slowed down as soon as the
ambient temperature reaches the high ambient temperature value.
Thermal management operations are controlled by the GX chipset, and settings are
provided through the BIOS setup program interface, Thermal Management Setup option
(See Section 4.1.10 CPU Board Feature Setup, Thermal management Options).
2.11. USB INTERFACES
Signals for two USB ports are available through the CPCI I/O connector J5.
The USB strengths are as follows: capability to daisy chain as many as 127 devices per
interface, fast bi-directional, isochronous/asynchronous interface, 12Mbps transfer rate, and
standardization of peripheral interfaces into a single format.
Signal Paths
Both USB 0 and USB 1 interface signals are available through the CPCI I/O connector
(J5).
Related Jumpers
None
BIOS Settings
4.1.9 PnP/PCI Configuration: Assign IRQ For USB
2.14
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