| 摘要 |
<p>A method and apparatus is provided for translating an L-bit input signal to a W-bit output signal such as a virtual network identification signal to an internal virtual network signal. The translation is performed using a multi-stage lookup. The input signal is portioned into a plurality of subsets of bits. A first index to a first stage is provided by combining a portion of bits and a first delta subset of bits. A second index to a second stage is provided by combining data stored at the first index in the first stage and the second delta subset of bits. The corresponding output signal is stored at the last index in the last stage. The use of the multi-stage lookup instead of a single-stage lookup reduces the memory required to perform the translation.</p> |
