| 摘要 |
<p>PURPOSE:To allot individual functions to a processor of standard processing so as to realize a processor with special processing functions, by forming a layout in which a periphery of a processor unit is surrounded in a looped shape with a plurality of wirings corresponding to a group of first signal terminals and a group of second signal terminals. CONSTITUTION:Signal terminals 1a, 1b,...1n required for fundamental operations corresponding to standard processes and signal terminals 11a, 11b,...11n required for individual operations corresponding to special processes are mounted beforehand on a microprocessor unit 1 side. A layout of wiring lines 2b of the individual signal terminals is performed outside fundamental wiring lines 2a. When special processing functions are added, these wiring lines 2b are selected from inside to outside of them. Hence, an area ranging from the microprocessor unit 1 to its internal bus 2 can be occupied to the minimum as needed, and I/O buffers or blocks can be selected more, and special I/O buffers or the like can be disposed. Further a system of a microprocessor of special processes or applications can be constructed by the use of the same microprocessor for general purpose.</p> |
