Can I have more than 8 slots in a CompactPCI system?
Yes. Each CompactPCI bus is limited to eight slots for electrical loading reasons. This can be easily expanded with PCI-PCI bridge chips, available from a number of manufacturers. The bridge chip acts as a sort of “super buffer” chip. Interrupts, plug-and-play information, and data are easily and generally automatically transferred across the bridge. A bridge chip usually exacts a one clock penalty ( generally about 30 nanoseconds) per transaction. If the data transaction is a burst mode type – transferring hundreds or thousands of bytes at a time – this overhead is extremely small. One advantage of bridge chips is that each side of the bridge can be performing data transfers to cards on its side of the bridge simultaneously.
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