The PCL-CAPELLA is a mezzanine side card, to be fixed on top
of a suitable CPU carrier board. The pitch between carrier
PCB and mezzanine PCB is 4HP, resulting in a 8HP common front
panel for the entire assembly.
Up to three mezzanine inter-board connectors are in use,
for distribution of legacy and high speed I/O signals from
the CPU carrier to the side board. These are referred to
as HSE (SATA & USB 2.0 High Speed Expansion), EXP (Legacy Expansion),
and PCIE (PCI Express® x 4). The mezzanine connectors are situated
on the bottom side of the PCL-CAPELLA, facing towards their mating
CPU card connectors.
With respect to the system backplane, it is recommended to have the
CPU card system slot on the right edge, in order to prevent loss of
a peripheral slot (the PCL-CAPELLA is then positioned out of backplane
shape). The rear I/O option requires a single slot P1/P2 RIO backplane
or similar custom solution in addition, and is available with
CompactPCI® PlusIO CPU carrier cards only, such as the PC1-GROOVE and
PC3-ALLEGRO. Rear I/O is not available with a CompactPCI® Serial CPU carrier,
since the CPCI Serial backplane connector suite (CPU system slot)
would slightly overlap the hard metric P1/P2 connectors as required
for the PCL RIO backplane.