US 6,271,548 B1 · Master slice LSI and layout method for the same · patentgrep

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Abstract

A master slice layout technology is provided to improve integration density of a semiconductor integrated circuit such as ASIC. In particular, a plurality of gate basic cells are arranged on a semiconductor chip and then a wiring channel grid having non-uniform pitches is defined on the gate basic cells. If a layout of metal wirings is designed along the wiring channel grid, miniaturizable patterns can be set to smaller values while maintaining line widths of predetermined metal wirings such as power supply wirings at preselected values. Since flexibility for the layout of the metal wiring layers is large, miniaturization of the patterns can be attained even if design rules for basic cell process and wiring process are different.

Claims25

Dependent claims

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;
and
interconnections 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.

4 more elements

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 routing 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;
and
an interlayer insulating film disposed on the gate polysilicon and the impurity doped regions, the interlayer insulating film having minimum 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;
and
interconnections disposed on the interlayer insulating film, the interconnections formed as a first metal layer directly connecting to the minimum contact holes,
positions of the interconnections being determined by a grid corresponding to a wiring channel grid employed in a design stage of the master slice LSI, the wiring channel grid being prescribed with respect to the basic cells and having non-uniformly spaced horizontal lines alone the X direction comprising a first set of lines having a first spacing and a second set of lines having a second spacing narrower than the first spacing and non-uniformly spaced perpendicular lines, the perpendicular lines comprise a third set of lines running in the central portion of the impurity doped region having a third spacing and a fourth set of lines having a fourth spacing narrower than the third spacing, the fourth 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.

6 more elements

A master slice LSI comprising:

a plurality of functional blocks, each functional block comprising:
basic cells periodically and densely arranged in a X-Y matrix form and without a routing 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;
and
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;
and
first interconnections disposed on the interlayer insulating film on the basic cells, the interconnections formed as a first metal layer directly connecting to the contact holes, positions of the first interconnections being determined by a grid corresponding to a wiring channel grid employed in a design stage of the master slice LSI, the wiring channel grid being prescribed with respect to the basic cell;
and
second interconnections disposed on the functional blocks, positions of the second interconnections being determined by the grid,
wherein the grid has non-uniformly spaced horizontal lines along the X direction comprising a first set of lines having a first spacing and a second set of lines having a second spacing narrower than the first spacing and non-uniformly spaced perpendicular lines orthogonal to the non-uniformly spaced horizontal lines, the perpendicular lines comprise a third set of lines running in the central portion of the impurity doped region having a third spacing and a fourth set of lines having a fourth spacing narrower than the third spacing, the fourth 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.

8 more elements

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 routing 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;
and
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 first grid corresponding to a first wiring channel grid employed in a design stage of the master slice LSI, the first wiring channel grid being prescribed with respect to the basic cell, the first wiring channel grid consisting of 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;
and
interconnections 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 a second grid corresponding to a second wiring channel grid employed in the design stage of the master slice LSI, the second wiring channel grid having a different pitch than that of the first wiring channel grid, the second wiring channel grid being prescribed with respect to the basic cells and having non-uniformly spaced lines and other lines orthogonal to the non-uniformly spaced lines.

6 more elements

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 routing channel between the basic cells, each of the basic cells comprising:
impurity doped region 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 polysilicon and 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;
a first wiring formed as a first metal layer directly connecting to the contact holes, the first wiring disposed on the interlayer insulating film along a Y direction orthogonal to the X direction;
and
a set of second wirings formed as a first metal layer directly connecting to the contact holes, the second wiring disposed on the interlayer insulating film with a constant pitch along the Y direction, a spacing from a center line of the first wiring to the center line of one of the second wirings disposed to nearest to the first wiring differs from the constant pitch,
wherein the first and second wirings are arranged such that positions of the first and second wirings are determined by a grid corresponding to a wiring channel grid employed in a design stage of the master slice LSI, the wiring channel grid being prescribed with respect to the basic cells, the wiring channel grid has non-uniformly spaced lines along the Y direction and uniformly spaced lines along the X directions, the non-uniformly spaced 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.

6 more elements

A master slice LSI comprising:

(a) a semiconductor substrate;
(b) a plurality of basic cell sets periodically and densely arranged on the semiconductor substrate in a X-Y matrix form and without a routing channel between the basic cells, each of the basic cell sets comprising:
a first impurity doped region of a first conductivity type having upper, middle and lower areas, formed at a surface of the semiconductor substrate, the upper, middle and lower areas serving as source and drain regions;
a second impurity doped region of the first conductivity type having upper, middle and lower areas, formed at a surface of the semiconductor substrate, the upper, middle and lower areas serving as source and drain regions;
a first contact region of a second conductivity type opposite to the first conductivity type, sandwiched between the first and second impurity doped regions;
a first couple of gate polysilicons disposed along a horizontal direction on the semiconductor substrate so as to divide the first impurity doped region into upper, middle and lower areas, each of the gate polysilicons having first and second rectangular end regions;
a second couple of gate polysilicons disposed along the horizontal direction on the semiconductor substrate so as to divide the second impurity doped region into upper, middle and lower areas;
and
an interlayer insulating film disposed on the first and second impurity doped regions, and on the first and second couples of gate polysilicons;
and
(c) a plurality of contact holes formed in the interlayer insulating film so as to expose a part of the first and second impurity doped regions, configured such that contact holes on the middle areas of the first impurity doped regions are aligned on a first horizontal line, contact holes on the lower areas of the first impurity doped regions are aligned on a second horizontal line and contact holes on the first contact region are aligned on a third horizontal line, and a spacing between the first and second horizontal lines wider than the spacing between the second and third horizontal lines;
wherein the contact holes are arranged such that positions of the contact holes are determined by cross points of a grid corresponding to a wiring channel grid employed in a design stage of the master slice LSI, the wiring channel grid being prescribed with respect to the basic cells, the wiring channel grid having non-uniformly spaced horizontal and perpendicular lines, a part of the non-uniformly spaced horizontal lines correspond to the first, second and third horizontal lines.

9 more elements

Dependencies are inferred from the claim text.