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EPC-9 Hardware Reference
2-4
2
2
xxxOUT
xxxIN
xxxOUT
xxxIN
xxxOUT
xxxIN
VMEbus Slots
xxxIN
xxxOUT
Figure 2-1. Daisy-Chain Signal Concept.
The daisy-chain signal concept is shown in Figure 2-2. The Slot-1 controller board
initiates each daisy-chain signal. Each VMEbus slot to the right of the Slot-1
controller, as viewed from the front, must pass through each of the daisy-chained
signals. For each VMEbus slot, xxxIn pin must be connected to its corresponding
xxxOut pin (e.g. BG0In to BG0Out, BG1In to BG1Out,...,IackIn to IackOut) either
through the board in that slot or by jumpers. (Boards that meet VMEbus
specifications correctly handle the signals and do not need backplane jumpers.
However, many early designs may not handle any of these signals. Check the manual
for each board to be installed to determine if these signals are passed through
correctly. If these signals are not handled correctly by the board in question, or if the
VMEbus slot is empty, all (or some) of these signals must be jumpered to the next
location in the daisy-chain. See Figures 2-3 and 2-4 on the following pages for
examples.
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