C
OMPACT
CHAMP-AV IV U
SER
’
S
M
ANUAL
C
URTISS
-W
RIGHT
C
ONTROLS
E
MBEDDED
C
OMPUTING
2-6
814256 V
ERSION
2 F
EBRUARY
2006
PPMC (Processor
PMC) and PCI-X
Support
In addition to meeting the signaling standards of PMC cards, the Compact CHAMP-AV IV
provides support for th PPMC (Processor PMC) standard and the PCI-X standard. The signals
used to support these standards are listed in the table below:
The Compact CHAMP-AV IV provides support for an optional second PCI Agent. Non-
monarch PPMCs may include an optional second PCI agent. The Compact CHAMP-AV IV only
supports one load per PMC PCI signal.
T
ABLE
2.3:
PPMC and PCI-X Support
Signal Name
Description
MONARCH#
The MONARCH# signal (Jn2 pin 64) is used to enable or disable the monarch feature on a Processor
PMC (PPMC). The PPMC specification defines two states for the MONARCH# signal: float to disable
the monarch feature and drive low to enable the monarch feature. Since the Compact CHAMP-AV IV
baseboard performs the monarch (PCI enumeration and interrupt) functions for the respective PCI
buses, the baseboard allows the MONARCH# signal to float to disable the monarch feature on PPMCs.
Standard PMCs (non-PPMC) function properly since the PPMC specification defines an unused PMC
pin for the MONARCH# signal.
M66EN
In conventional PCI mode (PCIXCAP grounded), the M66EN signal (Jn2, pin 47) is used to select the
PCI bus frequency. If the PMC grounds the signal, 33 MHz operation is selected. If not grounded by the
PMC (pulled up on the baseboard) then 66 MHz operation is selected.
PCIXCAP
PCIXCAP (Jn1, pin 39) is a 3-level signal that is utilized to select between conventional PCI (PCI 33 and
PCI 66), PCI-X 66, and PCI-X 100. When the PMC grounds PCIXCAP, conventional PCI mode is
selected. When the PMC connects PCIXCAP to ground through a 10 KOhm ±5% resistor in parallel with
a 0.01
µ
F ±10% capacitor, PCI-X 66 MHz mode is selected. When the PMC connects PCIXCAP to
ground through a 0.01
µ
F ±10% capacitor, PCI-X 100 MHz mode is selected.
IDSELB
The IDSELB (Jn2 pin 34) is used to select an optional second PCI agent.
REQB#
The REQB# signal (Jn2 pin 52) is a request issued by the optional second PCI agent requesting the
ownership of the PCI bus.
GNTB#
The GNTB# signal (Jn2 pin 54) is a grant issued to the optional second PCI agent requesting the owner-
ship of the PCI bus via the corresponding REQB# signal.
RESETOUT#
The RESETOUT# signal (Jn2 pin 60) is an active low, open drain output from the PMC. When asserted
by the PMC, the
Compact CHAMP-AV IV
will perform a board reset (same as pushing the reset switch
on the
Compact CHAMP-AV IV
board).
EREADY
The EREADY signal (Jn2 pin 58) is an open drain output on non-monarch PMCs that indicates the PMC
has completed its on-board initialization and can respond to PCI bus enumeration. The
Compact
CHAMP-AV IV
configuration software will not perform enumeration on the respective PMC until the
PMC releases this signal.
Warning
Per the PMC specification, the Compact CHAMP-AV IV only allows a PMC to place
one load on each PCI signal. Failure to adhere to this requirement can cause
timing violations on the affected signals, resulting in data loss and or corruption.
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