Onboard Power Supplies; Board Reset Logic - Motorola CPCI-6020 Installation And Use Manual

Onboard Power Supplies

4.10.3 Onboard Power Supplies
The CPCI-6020 requires +5 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 either +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 through +3.3 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:
Power-on/under voltage reset
Front panel reset switch
CompactPCI PRST#
Watchdog Timer reset via Harrier A WDT2
CompactPCI FAL# signal
Software generated hard reset via the Harrier RSTOUT bit
Software generated hard reset via the Port 92 Register in the PBC
CompactPCI Bus reset via the 21154 Bridge Control Register
Processor RISCWatch JTAG emulator interface HRESET# signal (open collector)
CPCI-6020 CompactPCI Single Board Computer Installation and Use (6806800A51C)
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Functional Description
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