| 摘要 |
PURPOSE:To reduce the load for host processor, by supplying the data on the main memory to the 1st line and making folding test so that diagnosis can be made by using the data to the 2nd line. CONSTITUTION:The diagnostic mode in the control information 10 designated with the address M of the diagnostic command DIAG is set with the host processor 1. The folding test data is used by X-byte starting from the address N on the main memory 2. The communication controller 3 receives the control word 8 with the memory 4-1 according to the line A1, and the diagnostic instruction of the control word 9 is received at the memory 4-2 corresponding to the line A2. Further, the device 3 transmits the data for 1 byte's share on the memory 2 to the line 1, the data is received on the line 2, and folded data is received at the memory 4-2. The data is compared with the diagnostic instruction data, and if in uncoincidence, error interruption is made to the device 1. Thus, the amount of data is reduced on the main memory, allowing to reduce the load of the device 1. |
