| 摘要 |
An uncommitted logic array (ULA) integrated circuit comprises cells of different complexity in order to provide flexibility of interconnection and enable the integrated circuit chip size to be minimised. The integrated circuit chip (31) may be provided with a plurality of sets (30) of cells (32, 33, 34). The cells 32, which are the smallest, are committed to a specific function and have a high transistor density per unit area. The cells 33 have the same type and number of transistors as the cells 32 but are of a larger area. The transistors of cells 33 are only partially interconnected but can be interconnected, by means of a customised metallisation pattern, to provide the same specific function as cells 32, or can be interconnected to provide lower complexity logic functions if the specific function is not required. The largest cells 34 contain unconnected or only partially interconnected transistor arrays, have the lowest transistor density per unit area of the three sizes of cells, and may be interconnected merely to provide required low complexity logic functions. <IMAGE> |
