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Wednesday, December 6, 2023

How the Worlds of Chiplets and Packaging Intertwine


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Chiplets mark a brand new period of semiconductor innovation, and packaging is an intrinsic a part of this formidable design endeavor. Nevertheless, whereas chiplet and packaging applied sciences work hand in hand to redefine the probabilities of chip integration, this technological tie-up isn’t that straightforward and easy.

In chip packaging, the naked chip die is encapsulated in a supporting case with electrical contacts. The case protects the naked die from bodily hurt and corrosion and connects the chip to a PCB. This type of chip packaging has existed for many years.

Nevertheless, as a result of slowdown of Moore’s legislation and the growing price of monolithic IC manufacturing, the trade started to undertake superior packaging strategies like silicon interposers. Superior packaging additionally provides to the price, which solely massive chips serving high-performance computing (HPC) purposes can typically afford.

Then, there’s the added design complexity that comes with superior packaging options. As an illustration, interposers require an additional piece of silicon, limiting the actual property that designers can placed on chips. Furthermore, silicon interposers restrict total system-in-package (SiP) dimension, which lowers wafer check protection. That, in flip, impacts yield, will increase complete price of possession, and extends manufacturing cycle instances.

Enter chiplets, which promise smaller SiP footprints at decrease energy consumption. In different phrases, in comparison with superior packaging applied sciences, chiplets can obtain related bandwidth, energy effectivity, and latency with die-to-die implementations—all whereas utilizing commonplace packaging.

Determine 1: Chiplets facilitate single-package integration of a number of silicon die utilizing high-density substrates, silicon interposers, bridges and different interconnect strategies. (Supply: Cadence)

Chiplets cut up a monolithic IC into a number of practical blocks, reconstitute the practical blocks into separate chiplets, after which re-assemble them on the package deal stage. However chiplets should talk with one another by way of dense, quick and high-bandwidth connections. That’s the place its tough relationship with packaging involves the fore.

Normal or superior packaging?

Eliyan CEO Ramin Farjadrad says that chiplets get rid of the drawbacks and limitations of superior packaging. Corporations like Eliyan are demonstrating die-to-die implementations in commonplace natural packaging, which in accordance with Farjadrad, permits the creation of bigger SiP options, resulting in increased efficiency per energy at significantly decrease price and better yield.

Farjadrad developed the bunch of wires (BoW) chiplet system that was later adopted by the Open Compute Mission (OCP) as an interconnect commonplace. Nevertheless, now the trade is coalescing across the Common Chiplet Interconnect Categorical (UCIe) interface designed to standardize the die-to-die interconnects between chiplets with an open-source design.

The UCIe Consortium is carving the chiplet markets in two broad ranges: commonplace 2D packaging strategies and extra superior 2.5D strategies, comparable to chip-on-wafer-on-substrate (CoWoS) and embedded multi-die interconnect bridge (EMIB). Superior packaging choices like CoWoS and EMIB present increased bandwidth and density.

That’s a testomony to packaging’s essential position in chiplet design and the way it impacts a chiplet’s efficiency. Take the case of the UCIe-connected, chiplet-based check chip that Intel lately showcased at its annual occasion, Innovation 2023. The corporate fabbed the chip on an Intel 3 course of node and paired it with a Synopsys UCIe IP chiplet fabbed on TSMC’s N3E node. The 2 chiplets interconnect through Intel’s EMIB interface.

Determine 2: Chiplet designs are open to a wide range of packaging strategies relying on particular software wants. (Supply: UCIe Consortium)

Chiplet packaging ecosystem

Not surprisingly, the semiconductor trade is beginning to see initiatives on the intersection of packaging and chiplets. First, Faraday Expertise has launched a 2.5D/3D packaging service that claims to facilitate seamless integration of multi-source dies in chiplets. The Hsinchu, Taiwan-based, Faraday is working carefully with fabs and OSAT suppliers to make sure that it fulfills capability, yield, high quality, reliability and manufacturing schedule necessities whereas offering these companies.

Second, Siemens EDA unveiled a design-for-test (DFT) resolution for multi-die architectures that join dies vertically (3D IC) or side-by-side (2.5D) in a single machine. The Tessent multi-die software program resolution can generate die-to-die interconnect patterns and allow package-level assessments utilizing Boundary Scan Description Language (BSDL).

In keeping with John Lorenz, senior analyst of computing and software program options at Yole Intelligence, the economics of adopting a chiplet strategy for IC design are tightly linked with the price and maturity of the interconnect and packaging resolution. Nevertheless, whereas interface and interconnect applied sciences are successful the limelight, there’s much less readability on the position of packaging in chiplet designs.

That may change with the appearance of the UCIe commonplace that goals to create a common interconnect on the package deal stage. Its purpose is to facilitate a vibrant, multi-vendor ecosystem for chiplets, so semiconductor companies can merely choose chiplets from different designers and snap them into their designs with minimal design and validation work.

Within the ultimate evaluation, chiplets will cater to each commonplace natural packaging, in addition to superior packaging options. Design engineers should decide an optimum package deal construction for his or her chiplets within the early stage of the design course of alongside die dimension, substrate, bump pitch and depend, energy evaluation, and thermal simulation.

However one factor is obvious: packaging know-how is intrinsically tied to the way forward for chiplet design. And there’s no one-fits-all resolution in terms of packaging in chiplets.

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