Table of Contents
Advertisement
Functional Description
3
PRESENT# Signal
MONARCH# Signal
INTA#-INTD# Signals
M66EN Signal
3-14
PCI bus pullup resistors required by the PCI Revision 2.1 Specification,
including 64-bit expansion signals, must be supplied by the carrier board.
This is required if the PrPMC750 is operating as a Monarch or Non-
monarch.
The following special function PMC pins, as defined by the VITA 32-199x
processor PMC specification, are implemented on the PrPMC750 as
described in the following sections.
The PRESENT# signal on the PrPMC750 module is grounded to indicate
to the carrier board that the module is installed.
The MONARCH# input signal allows the carrier board to enable the
monarch controller features on the PrPMC750 module. The PrPMC750
will pullup the MONARCH# signal. If the carrier board grounds this pin,
the PrPMC750 module will operate as a monarch and provide system
initialization and PCI interrupt handling. If the carrier leaves
MONARCH# floating, the PrPMC750 will operate as a non-monarch.
The four PCI interrupt signals are routed to MPIC external interrupt inputs
so that they can be monitored by the processor when the PrPMC750 is
operating in the Monarch mode. In the non-monarch mode, the PrPMC750
can generate an interrupt to the host board processor on any one PCI
interrupt INTA#-INTD# by activating the Processor 1 interrupt output
from MPIC. Refer to the interrupt section of the PRPMC750
Programmer's Reference Guide for interrupt assignments.
The M66EN pin is grounded on the PrPMC750 to request that the carrier
board operate at 33 MHz.
Computer Group Literature Center Web Site
Advertisement
Table of Contents
