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.
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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.
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