| 摘要 |
PURPOSE:To omit the exclusive logic for suppression of the ineffective output by adding the 1-bit parity bit as well as installing the OR circuit, at the same time ensuring the immediate use of the effective output. CONSTITUTION:Decoder 205 delivers the output of 2<m+1> bits to the input of total m+1 bits of significant bits I1-Im and parity bit IP. Among these output, the 2<m> bits (ineffective output) which is delivered when the parity error exists in the m+1 bit input is supplied to OR circuit 206. The rest 2<m> bits are the effective output to m-bit input I1-Im and delivered when no parity error exists to m+1 bit input I1-Im plus IP. Thus the ineffective output to the input containing the parity error is never transmitted outside, and as a result the exclusive logic can be omitted for suppression of the ineffective output. At the same time, the effective output can be used immediately. |
