2
Netra CP3010 Board Programming Guide
• January
2006
Power Requirements
The onboard voltage controller allows power to the CPU of the Netra CP3010 board
only when the following conditions are met:
■
VDD core-1.7-volt supply voltage is greater than 1.53 volts (within 10 percent of
nominal)
■
12-volt supply voltage is greater than 10.8 volts (within 10 percent of nominal)
■
5-volt supply voltage is greater than 4.5 volts (within 10 percent of nominal)
■
3.3-volt supply voltage is greater than 3.0 volts (within 10 percent of nominal)
The controller requires these conditions to be true for at least 100 milliseconds to
help ensure the supply voltages are stable. If any of these conditions become untrue,
the voltage monitoring circuit shuts down the CPU power of the board.
Inlet, Exhaust, and CPU Temperatures
The following table summarizes the functions on the Netra CP3010 board that
monitor the hardware environment.
The CPU diode sensor reading might vary from slot to slot and from board to board
in a system, and is dependent primarily on system cooling. As an example, a system
might have sensor readings for the CPU diode from 35˚C to 49˚C with an ambient
inlet of 21˚C across many boards, with a variety of configurations and positions
within a chassis. You must take care when setting the alarm and shutdown
temperatures based on the CPU diode sensor value. This sensor typically is linear
across the operating range of the board.
TABLE
1-1
Hardware Environmental Monitoring Functions
Function
Description
Board exhaust air
temperature
Senses the air temperature at the trailing edge of the board.
(Assumes air direction from the processor/heatsink toward the PCI
mezzanine card (PMC) slots.)
CPU diode
temperature
Senses a diode temperature in the processor junction.
Board inlet air
temperature
Senses the air temperature at the leading edge of the board under
the solder-side cover. (Assumes air direction from the
processor/heatsink toward the PMC slots.)
