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RESETOUT_L Signal
The processor PMC RESETOUT_L output signal (P12-60) provides a
means for the PrPMC750 to reset the carrier board. The active low open
drain RESETOUT_L signal is active whenever the PrPMC750 power-up
reset, Watchdog Timer 2 reset, software generated Module reset, or Debug
switch reset is active. The PMC PCI reset input signal will not generate
RESETOUT_L.
PCI Signaling Voltage Level
The PrPMC750 module is a universal PMC module which will operate
with 3.3V or 5V signaling levels. The PMC VIO pins supply the voltage
to the Hawk PCI interface clamp diode voltage pins allowing the PCI
interface to operate at either voltage level.
Note
ABORT# and RESET# Signals
The debug header provides ABORT# and RESET# inputs for debug
purposes. The ABORT# signal is connected to the MPIC to generate an
interrupt and RESET# is ORed with the board reset logic. Each signal is
debounced on the PrPMC750 module.
On-Board LED's
The PrPMC750 module provides two LEDs mounted on side 2 of the
module for status: CPU and FAIL.
Refer to the PRPMC750 Programmer's Reference Guide for details of the
MODFAIL register.
http://www.motorola.com/computer/literature
The PCI clock input signal is a 3.3V only input.
The green CPU LED is lit when the DBB# signal of processor bus
is active.
The yellow FAIL LED is lit when the MODFAIL signal line is
active (software controlled).
Block Diagram
3
3-15
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