Patent ID: 6271548
Filing Date: 2001-08-07
Classification: H01L

Abstract:
A master slice LSI comprising:a semiconductor substrate;a plurality of basic cells periodically and densely arranged on the semiconductor substrate in a X-Y matrix form and without a routine channel between the basic cells, each of the basic cells comprising:impurity doped regions serving as source and drain regions;a gate polysilicon having first and second rectangular end regions and an active gate region sandwiched between the first and second rectangular end regions, the gate polysilicon disposed along a X direction on a part of the semiconductor substrate sandwiched by the impurity doped regions;an interlayer insulating film disposed on the gate polysilicon and the impurity doped regions, the interlayer insulating film having contact holes so as to expose a part of the impurity doped regions and the first and second rectangular end regions of the gate polysilicon, positions of the contact holes being determined by cross points of a grid, the grid corresponding to a wiring channel grid employed in a design stage of the master slice LSI; andinterconnections disposed on the interlayer insulating film, the interconnections formed as a first metal layer directly connecting to the contact holes, positions of the interconnections being determined by the grid, the wiring channel grid being prescribed with respect to the basic cells and having X directional lines and non-uniformly spaced Y directional lines, the Y directional lines comprise a central set of lines running in the central portion of the impurity doped region and a peripheral set of lines having a spacing narrower than the spacing of the central set of lines, the peripheral spacing being defined as a distance between a gate contact hole disposed on the second rectangular end region of the gate polysilicon and a nearest neighboring diffusion contact hole measured along the X direction from the gate contact hole, the nearest neighboring diffusion contact hole being disposed on and nearest to a Y directional edge of the impurity doped region.