CSCE 3730 Introduction to Integrated Circuit Design Methodologies

CSCE 3730 Introduction to Integrated Circuit Design Methodologies

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Introduction to Integrated Circuit Design Methodologies 1 Introduction to Integrated Circuits Integraded circuit combines dozens ( SSI ) to millions ( VLSI ) of transistors into a single chip. The locations and connections of the transistors are defined by several masks in the fabrication process. Application-specific-integrated circuits ( ASIC ) - ICs designed and used for a particular application e.g. telecom, automotive. - contrast to standard ICs e.g. memories and microprocessors which are used in different microleectronics systems 2
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ASIC Glossary Mask : A thin photographic film used to transfer part of a circuit pattern to the surface of a semiconductor wafer. A number of masks are used in combination with various additive and subtractive operations, to create the integrated circuits on a wafer. Wafer : circular silicon on which identical chips are patterned. Dies : individual ICs from slicing up of a patterned wafer. Defect density : a measure of the quality of the fabrication process (# defects per unit area). Yield : percentage of dies on a wafer that are good which depends on the comlexity and maturity of a process. 3 ASIC Design and Manufacturing Design Methodologies Full Custom Standard Cells Gate Arrays Programmable Logic Semicustom PLDs FPGAs 4
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Full-Custom ICs Custom ICs are created using unique custom masks for all layers during the man- afacturing process. Designers control all stages of the chip layout . Engineers design some or all of the logic cells, circuits, and the chip layout specifi- cally for a full-custom IC. Pros: complete design flexibility, high performance and density possible. Cons: large amount of design effort and high development cost. For applications requiring high volume, cost can be amortized over the high volume. 5 Standard-Cell-Based ICs Use predesigned logic cells from standard-cell library to implement the design. Standard cells are of the same height.
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This note was uploaded on 09/30/2008 for the course CSCE 3730 taught by Professor Li during the Fall '08 term at North Texas.

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CSCE 3730 Introduction to Integrated Circuit Design Methodologies

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