| 摘要 |
PURPOSE:To detect an error in a correct way even though a continuous 2-bit error is contained in a bit assigned to a parity by extracting the contents latched by a latch means at every (n) units to perform a parity check. CONSTITUTION:The output of a PROM6 is once latched by a latch circuit 7 and then supplied to a microprogram executing circuit 8 to produce an address which gives an access to a next microinstruction. This address is sent to the PROM6 through a bus (a). While the output of the circuit 7 is supplied to an error detecting circuit 9. The circuit 9 detects the error based on a parity check matrix. This parity check matrix is constituted as shown by an equation I in such a case where the microinstruction shows 5. Therefore the error can be detected although the continuous two bits are detective since conditions are satisfied with the parities 1P and 2P. |
