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This paper describes a security-aware cache targeting field programmable gate array (FPGA) technology. Our design is based on an architecture with a remapping table, which provides resilience against side-channel timing attacks. We show how this cache design can be optimised for FPGA re sources by an index decoder with content addressable memory structure, which can be customized to meet various requirements. We show, for the first time, how our security aware cache can be included in the Leon 3 processor, and its performance and resource usage are evaluated.