Skip to main content

OPEN SOURCE EFFORTS FOR BACK END DESIGN AND FABRICATION

 In this step, the RTL is transformed into a physical design. Synthesis tools are used to generate a gate-level netlist, which incorporates the physical component counterparts that were modeled in RTL, such as the SRAMs and I/O pads. The netlist is then made testable, and place-and-route EDA tools are used to physically place the gates and lay out the connecting wires. The physical design must adhere to strict design guidelines to ensure integrity and manufacturability, so it is verified at different stages.

SRAM generator from cornell-ece5745.github.io


Back-end modules like SRAMs and I/Os are closely tied to a foundry and technology node, building them requires specialized knowledge that is often proprietary.These modules are typically designed once by experts and reused. They are complex and essential design details are often unavailable and hence are scarce


Open source back-end EDA tools include Berkeley ABC, Open Circuit Design, YOSYS, and Virtual Place and Route (VPR). Because foundry design rules are sophisticated, back-end tools are targeted at older technology nodes. OpenAccess is an industry-supported open source program for EDA tools.

In the final step, masks are made from the physical design, which is represented in the Graphical Database System II (GDS II) format, and the design is fabricated on silicon wafers. The silicon wafer is cut into die pieces and tested. The functional die is packaged and tested again, before being shipped. At this step, there exist even fewer fabrication- and packaging-related OSH efforts than for back-end design, although BaseJump (bjump.org) is an example from academia

Authored by Shray Tyagi

References:

1.)opencores.org

2.)Cornell -ECE5745

3.)Yosys Open SYnthesis Suite :: About (clifford.at)

Comments

Post a Comment

Popular posts from this blog

OPEN SOURCE EFFORTS FOR FRONT END DESIGN

  During front-end design, a solution is architected and implemented, typically in Register Transfer Logic (RTL), and might incorporate existing components such as memory and bus controllers. Some components, notably SRAMs and I/O pads, might undergo only behavior modeling in RTL. Once the front-end RTL is final, it is extensively tested and verified using simulators. Verification often dominates the effort and cost of this initial hardware design step. Complex components, or intellectual property (IP), such as processor cores, are usually designed by experts and reused. front-end design IP includes full-fledged cores such as RISC-V Rocket, OpenRISC, and LEON, as well as GPGPUs such as MIAOW, Nyami, and Nyuzi  The opencores.org repository provides a wide assortment of modules, such as memory controllers, arithmetic logic units (ALUs), floating-point units (FPUs), USB controllers, and Ethernet controllers. lowRISC ) is an open source SoC effort. Occasionally, industry provides ...
13 comments
Read more

THE NEED OF THE HOUR: Why the Semiconductor Industry requires an Open Source awakening?

Rise in silicon technology and the advances in hardware architecture have been instrumental in enabling new computing technologies and applications. But, with increasing chip-design costs and with the fall in the benefits of Moore’s law and Dennard scaling, the advances in silicon technology might well be grinding to a halt.  A DigiTimes report found out that foundry companies such as UMC (United Microelectronics), Global Foundries, and Vanguard International Semiconductor (VIS) have raised their 8-inch foundry quotes(In semiconductor industry it is custom to use foundry quotes, related to design requirements than an outright price) by 10-15% . Moore’s Law looked at the relation between process technology and economics. For half a century  the semiconductor industry pursued excellence in keeping with Moore's law. However  now the limitation to pack more transistors onto to a chip is a physical limitation called Dennard scaling which roughly states that  as transistor...
6 comments
Read more

OPEN SOURCE HARDWARE

Introduction: Open-source refers to a specific set of freedoms applying to a product, but also generally presupposes that the product is the object or the result of a process that relies on the contributions of geographically dispersed developers via the  Internet . An  open-source phenomenon has several properties that make it interesting for study, and relevant for the discipline of engineering design. Open source eschews traditional engineering concepts such as planning and prototyping in favor of a more organic approach. For instance, the open-source Linux kernel is one engineering feat that reaches high quality.  Simply put, open-source hardware is a term that refers to any type of device whose hardware specifications are fully documented or otherwise available.  Both  free and open-source software  (FOSS) and open-source hardware are created by this  open-source culture   movement and applying a concept to a variety of components.   T...
30 comments
Read more