| 摘要 |
PURPOSE:To reduce errors in data transmission and to decrease the transmission time, by providing a humming correction code and a parity bit to data to be transmitted in a specific method. CONSTITUTION:In storing data of 16 bits to an RAM of 4-bit unit, for example, data D1-D11 in order to bits of the RAM except a parity p are humming correction codes H0-H3 and the H0-H3 and O and obtained and added. In obtaining the H0 first, the bit test for D1, D2, D4, D5, D7, D9, D11 is done in accordance with the A and an even parity is obtained by adding the H0. Similarly, the H1, H2, H3 are obtained in accordance with the B,C,D. The parity of P is obtained by taking the bits of D1-D11, H0-H3, and P as an even number, for example. The information of D11 from the P thus obtained is transmitted from the RAM to external circuitry bit-serially in the order of Y0(P, H0, H1, D1), Y1(H2, D2, D3, D4), Y2(H3, D5, D6, D7) and Y3 (D8, D9, D10, D11). |
