2-4
Themis Computer
PMC/XMC Carrier Board Manual
User I/O on the 2P2 PMC/XMC Carrier Board can be accessed from both the front-panel
and paddle-board connectors. In some instances, accessing a signal from one of these
access sources prevents the signal from being accessed from the second source. For exam-
ple, if TTYE is routed to the VME P2 backplane, then TTYE cannot be accessed from the
front panel.
For information regarding paddle boards, refer to your system’s hardware manual
(for example, the TA64, TP32, et al.).
As explained further in Section 2.2.3.1 on page 2-10, user I/O on the PMC/XMC
Carrier Board can be reconfigured. For example, 64 bits of user I/O can be made
available on PMC Module slot 1, presuming the user I/O on PMC Module slot 2 is
not used. On the other hand, 32 bits of user I/O can be made available on both PMC
Module slot 1 and PMC Module slot 2.
2.1.1
PCI to PCI Bridge
The 2P2 PMC/XMC Carrier Board employs a PCI-to-PCI Bridge to interface PCI from the
baseboard to the PMC Slots, the Local interface device, and the Intel 82545GM Ethernet.
The device used to implement the PCI-to PCI-interface is an Intel 21154 PCI-to-PCI
Bridge (P/N FW21154BE). The Intel 21154 complies with
PCI Local Bus Specifica-
tion
, Revision 2.2, and has a 66-MHz/64-bit primary bus interface and a
66-MHz/64-bit secondary interface.
Note:
Some VME P2 I/O signals cannot be accessed using the available paddle
boards. You will need to provide your own connectivity, or call Themis Customer
Support for a cost estimate on building a
custom
Paddle Board.
Note:
User I/O signals can be brought from PMC Modules in
slot 1
and
slot 2
to
the VME P2 connector of the 2P2 PMC/XMC Carrier Board.
Caution:
It is important to make sure that a solder-bead configuration does not
result in an
unwanted change
of system operational parameters. READ ALL
SOLDER-BEAD CONFIGURATION DESCRIPTIONS CAREFULLY. (See
Table 2-9
on page 2-20.)
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