Download e-book for iPad: 14.Computers by John G. Webster (Editor)

By John G. Webster (Editor)

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For their obvious function rather than to minimize the number of devices. In this circuit the active low-output signals from the EPLD are combined with the active low data strobe signal DS0*, to enable individually the two bi-directional data buffers. The direction of data transfer is determined by inverting the WRITE* bus signal and applying it to the S/R* pins of the buffers. The DTACK* signal is generated in this circuit as soon as the buffers are enabled, so no wait states are generated. If it were necessary to access a slow device, such as ROM, additional logic would be needed to extend the bus cycles by delaying DTACK* and thus ensure that the required setup and hold times were met.

Repeat this process at each node until either the key is located or the last node reached was a leaf. In the latter case, the item being searched for is not present in the tree. Clearly this procedure takes O(h) time. Inserting a given item with a key k is similar in spirit to searching. Starting from the root, go down the tree, comparing keys as before, until a leaf node is reached. Now insert the item in a new node to the left or right of the leaf node as appropriate. The time taken is again O(h).

Because all these primitive operations require time O(h), it is important that the height of the tree be kept small. The minimum height a binary tree on n nodes can have is log n, which is achieved in the case of a full binary tree. But in the worst case, it could be as bad as n, for instance, if the items are inserted in sorted order of keys. , red-black trees, AVL-trees, B-trees, and splay trees). Heaps A heap can be visualized as a complete binary tree with the property that if v is the parent of u, key[v] Ͼ key[u].

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14.Computers by John G. Webster (Editor)


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