| 摘要 |
PURPOSE:To speed up large-amount data access from an SVP to the main body of the information processor by scanning data in and out continuously between one buffer and the internal registers or flip-flop of the processor. CONSTITUTION:Buffers 15-0 and 15-1 are so controlled by a switching circuit 17 that one buffer is used for writing and the other is for reading; and data writing to the former and data reading from the other are performed in parallel. Further, a scan control circuit 3 has a function for continuous writing to the buffer 15-0 from the internal registers 4 - 6 and 8 or flip-flop of the processor by indicated word length or the reading from the read-only buffer 15-1 and continuous scan-in processing to the internal registers 4 - 6 and 8 or flip-flop of the processor by indicated word length according to the indication from the service processor (SVP). Consequently, the access from the SVP to the main device to which processors of the same constitution are connected is speeded up. |
