memory-reference instruction

memory-reference instruction

[′mem·rē ¦ref·rəns in‚strək·shən]
(computer science)
A type of instruction usually requiring two machine cycles, one to fetch the instruction, the other to fetch the data at an address (part of the instruction itself) and to execute the instruction.
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Although successful acquisition uses a single memory-reference instruction, the lock is likely to have been recently acquired by some other CPU.