Rastergraf
Connector Pinouts and Cable Information 3-33
3.20 Connections to PMC Pn1, Pn2, and Pn4
All boards are connected to the host CPU via the standard 32-bit PMC Pn1
and Pn2 connectors. Most of the connections go only to the SM731. A few
lines go elsewhere on the board for reset, interrupt, and busmode.
See
Table 2-6
in
Section 2.5
for a hyperlinked listing of boards versus
pinouts.
Pn4 Connectors
The Topaz, Stratus, and Tropos versions can be ordered with graphics and
video on the PMC Pn4 connector for cases in which no connections to the
front panel are allowed. Garnet and Duros use
only
the Pn4 connector for
I/O. The signal sets presented on the rear panel are the same as the front
panel versions. At this time, Rastergraf does not have any Pn4 adapter
cards or cables for any board.
All boards except the TopazPMC have dual LVDS digital outputs that are
only
available on the Pn4 connector and are always wired to those pins.
Thus, even if you order a standard Tropos or Stratus (i.e., without the rear
panel I/O option), LVDS will still be on Pn4.
While using Pn4 I/O is very attractive for some applications, there can be
some serious difficulties in successfully deploying it. Due to the very high
frequency differential signals generated by the DVI and LVDS outputs,
great care must be taken in ensuring cleanly routed, equal length traces on
the host board between the Pn4 connector and the VME or CPCI
backplane connector.
Unless the carrier or host board vendor knew they were routing for the
graphics board, this kind of signal routing will not have been done. For
best results, Pn4 connections must be inner-layer matched length for DVI
and LVDS signals. Other I/Os require inner-layer ground pairs.
Problems with Pn4 I/O are endemic to PMCs, and are not unique either to
the boards in this manual in particular or to graphics boards in general.
Before committing to Pn4 solution, it is a good idea to contact the carrier
or host board vendor so as to obtain the necessary information to make a
good decision. Please contact Rastergraf for assistance.
The following table defines the names and uses for the signals on the Pn4
connector.
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