| 摘要 |
PURPOSE:To avoid the unnecessary retry and thus to enhance the reliability by comparing the contents read out in sequence with the contents of the control field to decide execution of the retry. CONSTITUTION:The CF is read out as N, N+1,... N+20... (N: first control field CF), and register R9 is counted up. The CF's of 39 times of reading are all decided are all decided discord each other when R9 becomes ''39'', and the discord error process is excecuted for CF.A (contents of register RO, R1 and R2) designated by the order. First, a comparison is given between the contents of R saving the contents of the sector given ''-1'' from CF.N and the contents of register R5 saving the sector of CF read out at 39th time. And in case a coincidence is obtained, no retry is executed, and the interruption is completed to CPU in the form of error interruption A. |
