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Browse Prior Art Database

Personalization of Driver Books Using Second-Level Metal

IP.com Disclosure Number: IPCOM000059683D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Banker, DC: AUTHOR [+4]

Abstract

In a masterslice design, a cell has fixed devices in the silicon that can be personalized to form several different functions. However, since, along with the fixed silicon, there is also present fixed metal shapes (for power, as an example), not all connections are possible. This may entail expanding the original design or discarding the desired circuit. This article describes a method by which the fixed metal shapes may be modified to fit the exact requirements of a particular circuit consistent with an auto-released masterslice image. Referring to Fig. 1, an example is shown of typical cells contained within a masterslice. A connection is shown that cannot be made on a second level because of a blockage formed by the power bus.

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Personalization of Driver Books Using Second-Level Metal

In a masterslice design, a cell has fixed devices in the silicon that can be personalized to form several different functions. However, since, along with the fixed silicon, there is also present fixed metal shapes (for power, as an example), not all connections are possible. This may entail expanding the original design or discarding the desired circuit. This article describes a method by which the fixed metal shapes may be modified to fit the exact requirements of a particular circuit consistent with an auto-released masterslice image. Referring to Fig. 1, an example is shown of typical cells contained within a masterslice. A connection is shown that cannot be made on a second level because of a blockage formed by the power bus. It is assumed in all these examples that the first-level metal area is not available to make these connections because of blockages on the first layer. Fig. 2 shows a representative vertical slice with devices under the power bus and, therefore, not accessible from second-level metal. The device would have to be moved to an open area and, thus, potentially enlarging the cell size. Fig. 3 demonstrates the method of modifying the fixed power bus to contain the connection on the second level. When a particular circuit is to be placed in the standard masterslice cell, a unique power bus section is included as well. The "fixed" power bus section in the region of the cell is removed, all...