Octagon PC-510, User Manual

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21-15
PC-510 user’s manual CPU power management
4. To disable all three options:
The PMI file contains:
pfh-enable=N Disables power fail options
Thermal management
Automatic thermal management of the CPU is provided by measuring
the full speed operation of the CPU verses a thermal equilibrium value.
During thermal management, CPU activity is monitored and the activ-
ity is considered against other criteria. When determined that the
activity level has exceeded a certain level, the CPU speed is divided in
half from 33 MHz to 16.5 MHz for about 30 seconds, the CPU speed is
increased to 33 MHz and the thermal management cycle begins again.
If thermal management is disabled, the CPU will run “full on” without
any intervention from the firmware. Default configuration from
Octagon Systems has thermal management enabled.
WARNING!
Due to the heat generated by the 586 processor, it is highly
recommended that thermal management is always enabled
and the CPU not run in “full on” condition. If thermal man-
agement is enabled and DOZE is enabled, the PC-510 will
operate to the published temperature specifications. If
thermal management is disabled, care must be taken not to
damage or shorten the life of the CPU. Adequate ventilation,
preferably with a fan and ample room around the CPU and
card cage must be provided. Please contact Octagon Techni-
cal Support if the thermal management is to be disabled to
discuss your situation.
The option for thermal management is in a .PMI file:
thermal-management=Y/N Enables thermal management
features (cool-down clocking )
Bitblt engine
W2[3-4] toggles the CPU clock speed between 120 and 133 MHz. When
pins 3 and 4 are jumpered, the CPU clock speed operates at 133 MHz.
When pins 3 and 4 are not jumpered, then the CPU clock speed operates
at 120 MHz.
W2[3-4] optimizes the PC-510’s temperature performance when the
CPU is operating in accelerated GUI environment. When power man-
agement is enabled, you must remove W2[3-4] to use the video accelera-
tor. This ensures that the PC-510’s operating temperature is between
–40°C and +70°C.