Dual-height cell with variable width power rail architecture
View Patent ↗A standard cell architecture with a basic cell that spans multiple rows of the standard cell. This multi-row basic cell may be a dual-height cell that spans two rows, or it may span more than two rows. The multi-row basic cell may be intermixed in a standard cell design with smaller, single-height cells for high-density applications. The single-height cells may be used where possible and higher-drive dual-height basic cells where larger transistors are desired. Other multiple height cells may also be included if even more current is desirable. The power rail may include conductors of varying width.
1. A layout architecture for an integrated circuit comprising:
an array of standard cell logic cells formed at least partially in a substrate and occupying a first plurality of adjacent parallel tracks;
a first metal layer;
a second metal layer wherein the first metal layer is disposed between the second metal layer and the substrate;
a plurality of first conductors extending across the logic cells on the second metal layer, each of said first conductors being coupled to a power supply, each conductor having a first side and a second side, wherein adjacent ones of the first conductors are coupled to different supply voltages; and
a plurality of second conductors in the second metal layer, each within a logic cell, each not coupled to a power supply;
wherein each of the plurality of second conductors occupies one track selected from the first plurality of adjacent parallel tracks and
wherein irrespective of whether each of the plurality of first conductors occupies one track selected from the first plurality of adjacent parallel tracks or occupies a second plurality of mutually adjacent tracks selected from the first plurality of adjacent parallel tracks, none of the first and second plurality of conductor mutually contact.
2. The layout architecture of claim 1 wherein a third plurality of conductors selected from the first plurality of conductors are each two tracks wide.
3. The layout architecture of claim 1 wherein a third plurality of conductors selected from the first plurality of conductors are each three or more tracks wide.
4. A layout architecture for an integrated circuit comprising:
an array of standard cell logic cells formed at least partially in a substrate and occupying a first plurality of adjacent parallel tracks;
a first metal layer;
a second metal layer wherein the first metal layer is disposed between the second metal layer and the substrate;
a plurality of first conductors extending across the logic cells on the second metal layer, each of said first conductors being coupled to a power supply, each conductor having a first side and a second side, wherein adjacent ones of the first conductors are coupled to different supply voltages; and
a plurality of second conductors in the first metal layer, each within a logic cell, each not coupled to a power supply;
wherein irrespective of whether each of the plurality of first conductors occupies one track selected from the first plurality of adjacent parallel tracks or occupies a second plurality of mutually adjacent tracks selected from the first plurality of adjacent parallel tracks, none of the plurality of first conductors blocks routing access to any of the plurality of second conductors.
5. The layout architecture of claim 4 a third plurality of conductors selected from the first plurality of conductors are each two tracks wide.
6. The layout architecture of claim 4 wherein a third plurality of conductors selected from the first plurality of conductors are each three or more tracks wide.