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cPCI-MXS64 Technical Reference Manual
CAUTION
When installing the cPCI-MXS64 at one end of the network,
jumper caps must be installed to connect the 120 ohms termination resistors
(See
Section 3.1 – Setting Jumpers).
2.9.4 Serial Port 4
The Serial Port 4 is buffered directly for RS-232 operations and is 16C550 PC-Compatible.
The interface includes the complete signal set for handshaking, modem control, interrupt
generation, and data transfer.
When assigned as Serial Port 4 logical port, the port is 100% compatible with the IBM-AT
serial port.
Signal Path
Serial Port 4 signals are only available through the J3 cPCI I/O connector.
Related Jumpers
None
BIOS Settings
11.3.7 Integrated Peripherals: Onboard Serial Port 4; IRQ Line for Serial Port 4.
2.10. THERMAL MANAGEMENT
Two temperature sensors are provided to supervise the thermal environment. One is used to
monitor the CPU die temperature, while the second one, located on the CPU casing, allows
the monitoring of the ambient temperature around the CPU.
The temperature is controlled according to two temperature levels, the Low temperature
limit, which indicates normal operating conditions, and the High temperature limit, which
indicates an overheating condition.
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).
2-12
W8 and W9
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