RadiSys EPC-8A, Справочник по аппаратуре

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Chapter 2: Configuration and Installation
7
• The EPC-8A connects to its peripherals via a subplane which extends to the right of
the EPC-8A. Make sure that the location you choose provides sufficient room for all
the attached peripherals (EXMs and mass storage module).
The EPC-8A plus EXM expansion modules plus any mass storage module can be
considered together as a single subsystem. Use the following worksheet in Table 2-1 to
determine the total number of VME slots your particular subsystem configuration
requires.
Once you determine where you want to place the EPC-8A subsystem in the chassis, the
VME backplane must be jumpered appropriately.
Installing the VMEbus Backplane Jumpers
The VMEbus propagates four bus grant signals (BG0
–
BG3) and one interrupt
acknowledge signal (IACK) via daisy-chain lines. Per the VMEbus specifications, all
boards (that plug into the backplane) are required to correctly handle these signals. All
slots that do not have a board plugged into the backplane (for example, empty slots and
slots occupied by EXMs or mass storage modules), need to be jumpered to allow the
signals to pass through to other boards in the system.
Table 2-1. VME Slots Available
Product VME Slots Total
Single-slot EPC-8A
(Includes first EXM module)
1
Double-slot EPC-8A
(Includes first two EXM modules)
2
Additional EXP-MC(s)
(Holds additional two EXM modules) 1
each
EXP-AM 2
Mass Storage Module (EXP-MX) 2
Total VMEbus slots used ................................................................... .
Figure 2-2. Daisy
-
Chain Signal Concept
xxxIN
xxxIN
xxxIN xxxIN
xxxOUT
xxxOUT
xxxOUT xxxOUT
VMEbus Slots