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Half-Full Flag The Half-Full (HF) Flag will be active LOW only when the net balance of the words written into the FIFO exceeds the number of words read out by 512 0r more. (See Figure 5.) Care should be exercised in using the Half-Full Flag, because it is capable of producing arbitrarily short pulses. For axample, if the FIFO contains 51 2 words, and Read and Write pulses are applied simultaneously, the HF flag may produce an arbitrarily short pulse, depending on the precise phase of Read and Write. HF will always settle to the correct state after the appropriate delay, tWHF or tRHF. This property of the Hajf-Full Flag is clearly a function of the dynamic relation between W and R. Generally, the use of level-sensitive, rather than edge-sensitive, status detection circuits will alleviate this hazard.