Granular channel width for power optimization
View Patent ↗A storage medium recording a cell library having one or more cells that may be readable by a computer and may be used by the computer to design an integrated circuit. The one or more cells may have a physical dimension parameter and a channel width parameter. The physical dimension parameter may be a footprint of the one or more cells. The channel width parameter may have a minimum driver size and a maximum driver size. The channel width parameter may define a range within which a tool varies the channel width between the maximum driver size and the minimum driver size during a design flow of the integrated circuit based upon one or more power criteria without changing the footprint.
1. A storage medium recording a cell library comprising one or more cells that are readable by a computer and used by said computer to design an integrated circuit, a given one of said cells comprising:
a footprint; and
a channel width parameter of a channel width, wherein (i) said channel width parameter defines a range within which a tool varies said channel width in said given cell during a design flow of said integrated circuit based upon one or more power criteria without changing said footprint of said given cell and (ii) said cell library further comprises a lookup table comprising (a) said power criteria, (b) one or more performance criteria or (c) a combination of both said power criteria and said performance criteria.
2. The storage medium according to claim 1 , wherein said lookup table bounds said tool in adjusting (i) a power usage of said given cell, (ii) a performance of said given cell, or (iii) a combination of both said power usage and said performance of said given cell.
3. The storage medium according to claim 1 , wherein said lookup table bounds said tool in adjusting (i) a static power usage of said given cell, (ii) a dynamic power usage of said given cell, or (iii) a combination of both said static power usage and said dynamic power usage of said given cell.
4. The storage medium according to claim 1 , wherein said cell library comprises a plurality of said given cells.
5. The storage medium according to claim 1 , wherein said channel width parameter comprises a width of a diffusion area in said given cell.
6. The storage medium according to claim 1 , wherein a particular channel width of said given cell is adjusted to a different channel width after said given cell has been placed and routed.
7. A method of creating a cell library comprising one or more cells used to design an integrated circuit, said method comprising the steps of:
(A) storing a footprint of a given one of said cells in a storage medium using a computer; and
(B) storing a channel width parameter of a channel width in said given cell in said storage medium, wherein (i) said channel width parameter defines a range within which a tool varies said channel width in said given cell during a design flow of said integrated circuit based upon one or more power criteria without changing said footprint of said given cell and (ii) said cell library further comprises a lookup table comprising (a) said power criteria, (b) one or more performance criteria or (c) a combination of both said power criteria and said performance criteria.
8. The method according to claim 7 , wherein said lookup table bounds said tool in adjusting (i) a power usage of said given cell, (ii) a performance of said given cell, or (iii) a combination of both said power usage and said performance of said given cell.
9. The method according to claim 7 , wherein said lookup table bounds said tool in adjusting (i) a static power usage of said given cell, (ii) a dynamic power usage of said given cell, or (iii) a combination of both said static power usage and said dynamic power usage of said given cell.
10. The method according to claim 7 , wherein a dynamic power usage of said given cell is varied by said tool per a positive slack recovery.
11. The method according to claim 7 , wherein said channel width parameter comprises a width of a diffusion area in said given cell.
12. The method according to claim 7 , wherein a particular channel width of said given cell is adjusted to a different channel width after said given cell has been placed and routed.
13. A method of adjusting power in a design of an integrated circuit, said method comprising the steps of:
(A) performing a place and route of a plurality of cells in said design using a computer, wherein (i) a given one of said cells comprises (a) a footprint and (b) a channel width parameter of a channel width and (ii) said channel width parameter defines a range within which a tool varies said channel width in said given cell based on one or more power criteria without changing said footprint of said given cell;
(B) adjusting said channel width in said given cell with said tool; and
(C) finalizing said channel width in said given cell to create a final design of said integrated circuit, wherein a cell library of said cells comprises a lookup table comprising (i) said power criteria, (ii) one or more performance criteria or (iii) a combination of both said power criteria and said performance criteria.
14. The method according to claim 13 , wherein said tool adjusts said performance criteria of said given cell.
15. The method according to claim 13 , wherein said lookup table bounds said tool in adjusting (a) a power usage of said given cell, (b) a performance of said given cell, or (c) a combination of both said power usage and said performance of said given cell.
16. The method according to claim 13 , wherein said lookup table further comprise a plurality of power usages of said given cell and a plurality of performances of said given cell.
17. A storage medium recording a cell library comprising one or more cells that are readable by a computer and used by said computer to design an integrated circuit, a given one of said cells comprising:
a footprint; and
a channel width parameter of a channel width, wherein (i) said channel width parameter defines a range within which a tool varies said channel width in said given cell during a design flow of said integrated circuit based upon one or more power criteria without changing said footprint of said given cell and (ii) said cell library further comprises a lookup table that bounds said tool in adjusting (a) a static power usage of said given cell, (b) a dynamic power usage of said given cell, or (c) a combination of both said static power usage and said dynamic power usage of said given cell.
18. The storage medium according to claim 17 , wherein said given cell further comprises one or more performance criteria.
19. A method of adjusting power in a design of an integrated circuit, said method comprising the steps of:
(A) performing a place and route of a plurality of cells of a cell library in said design using a computer, wherein (i) a given one of said cells comprises (a) a footprint and (b) a channel width parameter of a channel width and (ii) said channel width parameter defines a range within which a tool varies said channel width in said given cell based on one or more power criteria without changing said footprint of said given cell;
(B) adjusting said channel width in said given cell with said tool; and
(C) finalizing said channel width in said given cell to create a final design of said integrated circuit, wherein said cell library comprises one or more lookup tables comprising (i) a plurality of power usages of said given cell and (ii) a plurality of performances of said given cell.
20. The method according to claim 19 , wherein said given cell further comprise one or more performance criteria.