公开(公告)号：EP0011412A1

公开(公告)日：1980-05-28

申请号：EP79302374.8

申请日：1979-10-30

申请人： MOTOROLA, INC.

发明人： Gunter, Thomas Glen ,  Tredennick, Harry Leslie

IPC分类号： G06F9/26

CPC分类号： G06F9/26

摘要： A data processor having a microprogrammed control store is disclosed which includes a micro control store (18) having relatively short microwords which provide sequencing information and a nano control store (20) having relatively long nanowords which control transfers and operations within the execution unit (22) of the data processor. The micro control (18) store and nano control store (20) are addressed simultaneously with same address. Whereas each microword in the micro control store corresponds to a unique address, a single nanoword may be selected by many different addresses. Since each nanoword is unique, the overall size of the control store is minimized.