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TM
The CompactPCI
specification defines slot numbering seperating for
physical and logical slots. Each slot has a physical number and a
TM
logical number (refer to the CompactPCI
specification version 2.0 R
3.0 for further information on slot assignments). The physical numbers
are printed on the backplane, enclosed in circles or triangles, below
each slot. Slot 2, marked by a triangle, is the system slot and can only
be used by a CPU board. The other slot (slot 1) are a peripheral slot
and can be used by one peripheral card.
The logical number of each slot is defined according to the IDSEL
signal and the associated address used to select the slot. Table 3-1
shows the system slot and peripheral slot relationships on the
backplane. Physical slot 2 (system slot) has a logical number of 1, and
physical slot 1 has a logical number of 2. The connectors in logical
slot 1 are designated as 1-P1, 1-P2 and 1-P3 from the bottom up.
Nomenclature for connectors in the other slot is similar, such as 2-P1
and 2-P2.
Connector P1 on the system slot (slot 2) is a keyed connector provid-
ing 32-bit CompactPCI bus between the system slot and the peripheral
slot. Connector P2 on the system slot (slot 2) is an un-keyed connec-
tor providing 64-bit CompactPCI bus between the system slot and the
peripheral slots. Connector P3 on the system slot (slot 2) is open for
user definition.
Appendix A gives the pin assignment for all the connectors on the
backplane.
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