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Author: Admin | 2025-04-28
1. Introduction toApplication Specific Integrated Circuit 2. OutlineIntroductionASIC cell libraryASIC design stylesASIC design flowASIC design issuesASIC Vs. FPGAASIC design tools Reference12/16/2019 ASIC Design 2 3. Introduction12/16/2019 ASIC Design 3ASICApplicationSpecificIntegratedCircuit It is a custom integrated circuit designed andoptimized to fit a specific purpose and product. 4. Introduction… Examples of ICs that are an ASICs: a chip for a toy bear that talks; a chip for a satellite; a chip designed to handle the interface betweenmemory and a microprocessor for a workstationCPU; a chip containing a microprocessor as a celltogether with other logic.12/16/2019 ASIC Design 4 5. ASIC cell library The logic cells such as AND, OR, XoR, NOR,NAND, multiplexers, and flip-flops arepredesigned by designers using differentconfigurations, standardized and stored in theform of a library. Cell libraries are fixed set of well-characterized logic blocks.12/16/2019 ASIC Design 5 6. ASIC cell library… Each cell in an ASIC cell library must contain: A physical layout A behavioral model A Verilog/VHDL model A detailed timing model A test strategy A circuit schematic A cell icon A wire-load model A routing model12/16/2019 ASIC Design 6 7. ASIC design styles12/16/2019 ASIC Design 7 8. ASIC design styles…1. Full-Custom ASIC: Include some (possibly all) customized logic cells Have all their mask layers customized Manufacturing lead time is typically 8 weeks(time taken to make the IC does not include designtime)12/16/2019 ASIC Design 8 9. ASIC design styles…1) Full-Custom ASIC…Full-custom ASIC design makes sense only:When no suitable existing libraries exist orExisting library cells are not fast enough orThe available pre-designed/pre-tested cells consume toomuch power that a design can allow orThe available logic cells are not compact enough to fitorASIC technology is new or/and so special that no celllibrary exits.12/16/2019 ASIC Design 9 10. ASIC design styles…1) Full-Custom ASIC… Advantage: Offer highest performance lowest cost (smallest die size) Disadvantages: Increased design timeIncreased ComplexityHigher design costHigher risk.12/16/2019 ASIC Design 10 11. ASIC design styles…1) Full-Custom ASIC… Future: Maximum performance Minimized area Highest degree of flexibility Examples: Microprocessor High-Voltage Automobile Control Chips12/16/2019 ASIC Design 11 12. ASIC design styles…2. Semi-Custom ASIC: Also known as cell-based ASIC, which uses apre-designed some (possibly all) logic cells namelyAND gates, OR gates, Multiplexers, Flip-flops,…(i.e. called standard libraries). Only the placement of the standard cells andinterconnection is done. All mask layers are customized Custom blocks embedded12/16/2019 ASIC Design 12 13. ASIC design styles…2) Semi-Custom ASIC…12/16/2019 ASIC Design 13 14. ASIC design styles…2) Semi-Custom ASIC… Types:i. Standard cell-based (CBIC-
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