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Preparation and Installation
1
Monarch and Non-Monarch Processor PMCs
1-2
The traditional concept of host/master and slave/target processors changes
with the inception of the processor PMC because the arbiter, or clock
source, is traditionally located on the host board and does not reside on the
PrPMC750. The VITA 32 specification defines the terms Monarch and
Non-monarch to refer to these two modes of operation for processor
PMCs. A Monarch processor PMC is defined as the main PCI bus
processor PMC (or CPU) that performs PCI bus enumeration at power-up
or reset and acts as the PCI interrupt handler. The Non-monarch is a
slave/target processor that does not perform bus enumeration and does not
service PCI interrupts, but may generate a PCI interrupt to the host
processor.
A system may have one Monarch PrPMC750 and/or one or more Non-
monarch PrPMC750s, creating a loosely coupled multiprocessing system.
A PrPMC750 operating as a Monarch may be mated to a carrier board with
slave processors, PCI, and other I/O devices. A PrPMC750 operating as a
Non-monarch may be installed on a carrier with a host processor and other
PCI devices, such as an MVME2400 or an MCPN750 board. Different
versions of PPCBUG or other operating systems may be required for a
PrPMC750 board operating as a Non-monarch versus the monarch mode.
The PrPMC750 software is configured to operate as either a Monarch or
Non-monarch by reading the state of the MONARCH# pin on the
PrPMC750. This pin is either grounded or left open on the carrier board to
enable the desired mode of operation. Refer to the MONARCH# signal
explanation on page 3-13 of this manual for more information.
Carrier Board Requirements
A carrier board must provide the standard PCI interface, including 3.3V
and 5V power, PCI address/control, a PCI clock, and a PCI arbiter
REQ/GNT pair. Refer to the VITA-32-199x spec. The carrier board must
also ground the MONARCH# pin to enable the Monarch operating mode.
Leaving the MONARCH# pin open will enable the Non-monarch mode.
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