Onboard Power Supplies
Functional Description
CPCI-6020 CompactPCI Single Board Computer Installation and Use (6806800A51C)
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4.10.3
Onboard Power Supplies
The CPCI-6020 re5 V, +3.3 V, +1.8 V and +/-12 V (optional) input voltages. The
processor core voltage and +2.5 V for the Harrier core are generated on board from the +5 V
input by switching regulators. The processor core voltage regulator has a variable output which
is set using feedback resistors. In addition to the Harrier core voltage, the +2.5 V supply will
provide the processor, Harriers and L2 cache I/O voltage when the MPC7410 processor is
used. Power resistors installed during assembly will select 3.3 V or +2.5 V to supply the
I/O voltage for the processor, Harriers and the L2 cache. +1.8 V is generated using an onboard
regulator t3.3 V.
4.10.4
Board Reset Logic
A block diagram of the CPCI-6020 board reset logic is shown below. The board reset logic is
implemented in a programmable logic device (PLD) in order to provide maximum flexibility of
the circuit design.
There are several potential sources of reset on the CPCI-6020. They are:
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Power-on/under voltage reset
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Front panel reset switch
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CompactPCI PRST#
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Watchdog Timer reset via Harrier A WDT2
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CompactPCI FAL# signal
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Software generated hard reset via the Harrier RSTOUT bit
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Software generated hard reset via the Port 92 Register in the PBC
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CompactPCI Bus reset via the 21154 Bridge Control Register
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Processor RISCWatch JTAG emulator interface HRESET# signal (open collector)
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