Abstract: A 1-bit error correction circuit based on CRC calculation is provided with a syndrome generation circuit which determines input parallel data of m bits and which have been converted from n number of m-bit serial data. A 1-bit error detection circuit cyclically supplies a syndrome to a remainder calculation circuit and decodes remainder data obtained from this cyclic supply and detects 1-bit errors. A actual data reproduction circuit calculates the exclusive OR of output data of a predetermined register of a 1'st.about.n'th register of a syndrome generation circuit and data supplied to a predetermined register and obtains parallel data which is the actual data. A correction circuit which calculates a exclusive OR of parallel data obtained from a actual data reproduction circuit and 1-bit error data detected by the 1-bit error detection circuit and outputs corrected data.

Abstract: A write address counter for designating a write address of a memory counts up a control counter with an address change. A read address counter for designating a read address of the memory counts down the control counter with the address change. Inputted to an error detecting circuit are a write address counter value, a read address counter value and a control count value. There is detected whether a relationship such as Write Address Count Value-Read Address Count Value=Control Count Value is established or not. If not established, this implies an error, and a reset circuit resets each counter.