RETRIEVAL LOGICAL ARITHMETIC CIRCUIT

PURPOSE:To retrieve information at high speed by permitting a second means to execute a desired logical operation through the use of a comparison operation result outputted from a first means and a logical arithmetic result outputted from a third means. CONSTITUTION:Retrieved data is stored in a memory 12, is read out of the memory 12 by DMA 7 and is transmitted to a data buffer 8 and a comparison part 9. The data buffer 8 has the constitution of double buffers and data is stored in either of the buffers 8a and 8b. The comparison operation part 9 compares and operates retrieved data at every field and outputs the comparison operation result. The outputted comparison operation result is inputted to a logical arithmetic part 10 and final decision is executed. Then, the result part 10 and final decision is executed. Then, the result (OK or NG) is outputted. DMA 11 stores data in the data buffer 8a or 8b in the prescribed place in the memory 12 in accordance with the judgement result.