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Designing SOCs with Configured Cores by Steve Leibson

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14.6. Boost Throughput with Multiple Operations per Cycle

The Xtensa LX processor is not limited to performing one operation per cycle. TIE provides two ways to perform two or more operations at a time. SOC designers can create single-cycle TIE instructions that draw operands from several sources, perform multiple operations on these operands concurrently, and then output the results to several destinations. Alternatively, SOC designers can use the Xtensa LX processor’s FLIX (flexible length instruction extension) technology to create wide-word instructions that perform multiple independent operations during the same instruction cycle. The Diamond 570T CPU, Diamond 330HiFi DSP, and Diamond 545CK DSP all incorporate FLIX-format instructions, ...

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