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Computers and Technology, 06.03.2020 06:31, doe69902
You have been asked to investigate the relative performance of a banked versus pipelined L1 data cache for a new microprocessor. Assume a 64 KB two-way set associative cache with 64-byte blocks. The pipelined cache would consist of three pipe stages, similar in capacity to the Alpha 21264 data cache. A banked implementation would consist of two 32 KB two-way set associative banks. Use CACTI and assume a 65 nm (0.065 m) technology to answer the following questions. The cycle time output in the web version shows at what frequency a cache can operate without any bubbles in the pipeline.
Find the average memory access time if 20% of the cache access pipe stages are empty due to data dependencies introduced by pipelining the cache and pipelining more finely double the miss penalty. The access time is 0.92ns, the cycle time is 0.3ns. The number of pipeline stages is 3 and the miss rate is 0.0036.
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