C
URTISS
-W
RIGHT
C
ONTROLS
E
MBEDDED
C
OMPUTING
P
RE
-I
NSTALLATION
T
ASKS
814256 V
ERSION
2 F
EBRUARY
2006
2-5
F
IGURE
2.1: Position of 5V and 3.3V Keying Holes on a PMC Board
PMC I/O
The Compact CHAMP-AV IV board supports front panel user I/O and backplane user I/O
through the J3 and J5 cPCI bus connectors. The backplane I/O for PMC Site 1 (mounted
between Nodes A and D) is routed out the Compact CHAMP-AV IV cPCI bus J5 connector.
The backplane I/O for the PMC Site 2 (mounted between Nodes B and C) is routed out the
Compact CHAMP-AV IV cPCI J3 connector. Table A.5 on page A-7 and Table A.9 on page
A-11 show the backplane I/O connections for PMC sites 1 and 2. The I/O signals are routed
differentially (100 ohm differential impedance), as noted in Table A.19 on page A-29 but may
also be used in a single-ended mode as seen in Table A.20 on page A-30. The differential
routes are provided so that the I/O will support standard PMCs as well as high speed
differential PMCs.
PMC BUSMODE
Signals
On the Compact CHAMP-AV IV , the PMC BUSMODE[4:2] signals are hardwired and
constantly drive the following values in accordance with the Common Mezzanine Card
specification: BUSMODE[4:2] = 0b001. This signals the PMC card that it is connected to a
PMC site. If the card is a PMC card, it will drive a logic “0” on BUSMODE1 (this signal has
been renamed PRESENT# in the PPMC specification and is used to indicate the presence of
a PMC card). Note that the Compact CHAMP-AV IV receives the BUSMODE1 signal from each
PMC.
Warning
Please note that in either the 5V or 3.3V configuration, the Compact CHAMP-AV IV
does not provide a keying pin due to board real estate restrictions.
Installing a PMC with incompatible signaling levels can cause permanent damage
to the Compact CHAMP-AV IV baseboard as well as the PMC.
Review your PMC module’s power requirements carefully to ensure that you do
not install an incorrect PMC in a Compact CHAMP-AV IV PMC site.
5V
Ke
yi
ng
H
ole
3.
3V K
e
yi
ng
H
o
le
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com