Mca Instruction Cache Level-0 Instructionfetch Error A machine check is a hardware error detected by the processor Machine Check Architecture (MCA). The request which observed an error will fetch it's data from the main instruction memory as normal for a cache miss. The cache index and way (or ways) with A cache read miss from an instruction cache generally causes the most delay because the processor has to wait until the instruction is fetched from main memory.All instructions within a l-block are always executed together in sequence. Further, since the cache controller always loads a line of code into the cache,