Steps to Be Taken on an Instruction Cache Miss Send the block address of the original PC value (current PC-4) to the memory system. Instruct main memory to perform a read and stall until the read has completed. Update the block in cache. Assign the upper bits of the address to the tag. Turn the valid bit on. Refetch the instruction.

Chapter 7: Large and Fast: Exploiting Memory Hierarchy - 18 of 67