| 摘要 |
An associative memory comprises: first and second associative memory sections S1, S2, each of which is operable to receive an input word (VPI, VCI Fig. 2) and to output an address (S1, S2) at which that word is stored within the memory section concerned, and a logic unit (L) which has a first mode of operation in which the outputs from both memory sections are enabled, and a second mode of operation in which the output from only one of the memory sections is enabled. Circuit details of the logic unit (L) linking sections (S1, S2) is described (Fig. 4). The memory may be used in an asynchronous transfer mode (ATM) telecommunications system where the VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) fields are to be compared in an associative memory array. Thus the VPI and VCI data can be held separately. |
