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By John G. Webster (Editor)

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Reference 3 is a VMEbus user’s handbook, while Ref. 4 contains explanatory material and many practical examples including circuit diagrams for interfacing memory and peripheral devices and for implementing interrupts and DMA operations. PCI Boards Add-on boards at the high end of the performance range use a local bus operating at speeds close to that of the native processor. In 1992 Intel Corporation created the peripheral component interconnect (PCI) specification, partly to prevent a proliferation of local bus designs and partly to address the longer-term needs of the computer market by defining a highperformance bus which is non-processor-specific.

Suppliers of suitable PCI compliant programmable devices include Altera ADD-ON BOARDS Corporation (8) and Xilinx Inc. (9), both of whom also supply useful design and application notes on request. PCI Interfacing Examples. The production of a PCI compliant add-on card from scratch is a time-consuming task which can be speeded up in appropriate cases by the use of a PCI prototyping card. AMCC supply an evaluation board comprising a PCI Matchmaker interface chip, a nonvolatile RAM for holding configuration space information, a programmable memory, an ISA connector, and wire wrap areas to contain the user’s back-end application.

The following algorithm, due to Dijkstra, solves this problem. It maintains a set F of vertices whose shortest paths have been found. At each step, it chooses an appropriate vertex outside F and adds it to F. Each vertex is given a weight, which is updated as the algorithm proceeds, as long as the vertex is outside F. This weight is the cost of the best path found so far from v to the vertex. After a vertex is in F, its weight is final and is the cost of the shortest path from v to it. Initially, F is empty, v is given a weight 0, and every other vertex of G has a weight infinity.

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