Multi-Die and Chiplet Design Methodology is the EDA and architectural approach to designing systems composed of multiple smaller silicon dies (chiplets) connected through advanced packaging rather than a single monolithic die — enabling the combination of different process nodes, IP blocks from different vendors, and die sizes optimized for yield, where the design methodology requires new tools for die-to-die interface design, system-level floorplanning, cross-die timing closure, and thermal/power co-analysis that traditional single-die EDA flows do not provide.

Why Multi-Die/Chiplet

• Monolithic die: Larger die → exponentially lower yield → cost explodes above ~400mm².
• Chiplet: Four 100mm² dies at 90% yield each = 65% system yield vs. 400mm² at ~30% yield.
• Heterogeneous nodes: CPU on 3nm, I/O on 12nm, memory on dedicated → each optimized.
• Mix and match: Reuse proven chiplets across products → reduce design effort.
• Examples: AMD EPYC (CCD + IOD), Intel Meteor Lake (compute + SOC + GFX tiles), Apple M-series.

Multi-Die Design Flow

<svg viewBox="0 0 760 470" xmlns="http://www.w3.org/2000/svg" font-family="-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif"><rect x="0" y="0" width="760" height="470" rx="14" fill="#0d1117"/><text x="20" y="30" fill="#e6edf3" font-size="19" font-weight="700">Chiplets: dis-integrate the SoC, then re-integrate it in the package</text><text x="20" y="50" fill="#8b949e" font-size="12.5">Split a monolithic die into smaller chiplets, each on its best-fit node, joined over short die-to-die links</text><!-- ===== PANEL 1: dis-integrate then re-integrate ===== --><rect x="20" y="66" width="226" height="298" rx="7" fill="#0c141d" stroke="#30363d"/><text x="32" y="88" fill="#38bdf8" font-size="12" font-weight="700">1 &#183; Dis-integrate &#8594; re-integrate</text><text x="66" y="120" fill="#8b949e" font-size="8" text-anchor="middle">monolithic SoC</text><rect x="38" y="126" width="56" height="60" fill="#38506a" stroke="#6f8fb0"/><text x="66" y="152" fill="#dbe7f3" font-size="8" text-anchor="middle">one</text><text x="66" y="164" fill="#dbe7f3" font-size="8" text-anchor="middle">giant die</text><line x1="100" y1="156" x2="120" y2="156" stroke="#7ee6c0" stroke-width="2.2"/><path d="M120 156 l-7 -4 v8 z" fill="#7ee6c0"/><text x="110" y="146" fill="#7ee6c0" font-size="7" text-anchor="middle">cut</text><text x="182" y="120" fill="#8b949e" font-size="8" text-anchor="middle">chiplets in one package</text><rect x="126" y="126" width="106" height="66" rx="4" fill="#0c141d" stroke="#30363d"/><rect x="132" y="132" width="44" height="26" fill="#38506a" stroke="#6f8fb0"/><text x="154" y="148" fill="#dbe7f3" font-size="7.5" text-anchor="middle">compute</text><rect x="180" y="132" width="46" height="26" fill="#6b5fb0" stroke="#8f83c9"/><text x="203" y="148" fill="#e9e3ff" font-size="7.5" text-anchor="middle">I/O</text><rect x="132" y="162" width="44" height="24" fill="#3f6f5a" stroke="#6faf90"/><text x="154" y="177" fill="#d9f3e6" font-size="7.5" text-anchor="middle">SRAM</text><rect x="180" y="162" width="46" height="24" fill="#4a5a72" stroke="#6f8fb0"/><text x="203" y="177" fill="#dbe7f3" font-size="7.5" text-anchor="middle">HBM</text><g stroke="#38bdf8" stroke-width="1.6"><line x1="176" y1="145" x2="180" y2="145"/><line x1="154" y1="158" x2="154" y2="162"/><line x1="176" y1="174" x2="180" y2="174"/><line x1="203" y1="158" x2="203" y2="162"/></g><text x="32" y="220" fill="#adb5bd" font-size="8.6">Stop building one giant system-on-chip.</text><text x="32" y="232" fill="#adb5bd" font-size="8.6">Cut it into small chiplets, each its own die,</text><text x="32" y="244" fill="#adb5bd" font-size="8.6">then re-join them in the package over</text><text x="32" y="256" fill="#adb5bd" font-size="8.6">short die-to-die (D2D) links.</text><text x="32" y="280" fill="#38bdf8" font-size="9" font-weight="600">Dis-integrate, then re-integrate.</text><text x="32" y="302" fill="#8b949e" font-size="8.4">2.5D side-by-side or 3D stacked &#8212; both</text><text x="32" y="314" fill="#8b949e" font-size="8.4">are just ways to re-join the chiplets.</text><text x="32" y="336" fill="#8b949e" font-size="8.4">The seams almost vanish electrically.</text><!-- ===== PANEL 2: right node per function ===== --><rect x="267" y="66" width="226" height="298" rx="7" fill="#0c141d" stroke="#30363d"/><text x="279" y="88" fill="#a99cf0" font-size="12" font-weight="700">2 &#183; Right node per function</text><rect x="279" y="102" width="14" height="11" fill="#38506a" stroke="#6f8fb0"/><text x="300" y="111" fill="#e6edf3" font-size="8.7" font-weight="700">Compute tile</text><text x="392" y="111" fill="#8b949e" font-size="8">leading logic (N3/N2)</text><rect x="279" y="120" width="14" height="11" fill="#3f6f5a" stroke="#6faf90"/><text x="300" y="129" fill="#e6edf3" font-size="8.7" font-weight="700">Cache / SRAM</text><text x="392" y="129" fill="#8b949e" font-size="8">dense SRAM node</text><rect x="279" y="138" width="14" height="11" fill="#6b5fb0" stroke="#8f83c9"/><text x="300" y="147" fill="#e6edf3" font-size="8.7" font-weight="700">I/O &amp; analog</text><text x="392" y="147" fill="#8b949e" font-size="8">mature node (N7+)</text><rect x="279" y="156" width="14" height="11" fill="#4a5a72" stroke="#6f8fb0"/><text x="300" y="165" fill="#e6edf3" font-size="8.7" font-weight="700">Memory</text><text x="392" y="165" fill="#8b949e" font-size="8">DRAM / HBM stacks</text><line x1="279" y1="180" x2="481" y2="180" stroke="#30363d" stroke-width="1"/><text x="279" y="200" fill="#adb5bd" font-size="8.6">Each chiplet uses the process node that</text><text x="279" y="212" fill="#adb5bd" font-size="8.6">fits it: pay for leading-edge logic only</text><text x="279" y="224" fill="#adb5bd" font-size="8.6">where it earns its cost; cheap mature</text><text x="279" y="236" fill="#adb5bd" font-size="8.6">nodes carry I/O and analog.</text><text x="279" y="258" fill="#a99cf0" font-size="8.6" font-weight="600">That freedom is heterogeneous</text><text x="279" y="270" fill="#a99cf0" font-size="8.6" font-weight="600">integration.</text><rect x="279" y="284" width="202" height="64" rx="6" fill="#111a24" stroke="#30363d"/><text x="291" y="302" fill="#e6edf3" font-size="9" font-weight="700">UCIe standardizes the link</text><text x="291" y="319" fill="#adb5bd" font-size="8.4">A common die-to-die interface lets tiles</text><text x="291" y="331" fill="#adb5bd" font-size="8.4">from different vendors and nodes plug</text><text x="291" y="343" fill="#adb5bd" font-size="8.4">together &#8212; a chiplet marketplace.</text><!-- ===== PANEL 3: why, and the cost ===== --><rect x="514" y="66" width="226" height="298" rx="7" fill="#0c141d" stroke="#30363d"/><text x="526" y="88" fill="#34d399" font-size="12" font-weight="700">3 &#183; Why, and the cost</text><text x="526" y="108" fill="#e6edf3" font-size="10" font-weight="700">Why chiplets win</text><text x="526" y="126" fill="#adb5bd" font-size="8.7">&#8226; beat the ~800 mm&#178; reticle limit</text><text x="526" y="142" fill="#adb5bd" font-size="8.7">&#8226; small dies yield far better</text><text x="526" y="158" fill="#adb5bd" font-size="8.7">&#8226; reuse IP across many products</text><text x="526" y="174" fill="#adb5bd" font-size="8.7">&#8226; mix nodes; spin variants fast</text><line x1="526" y1="188" x2="728" y2="188" stroke="#30363d" stroke-width="1"/><text x="526" y="207" fill="#f87171" font-size="10" font-weight="700">The cost</text><text x="526" y="225" fill="#adb5bd" font-size="8.6">D2D links add energy and latency;</text><text x="526" y="237" fill="#adb5bd" font-size="8.6">assembly yield multiplies per die;</text><text x="526" y="249" fill="#adb5bd" font-size="8.6">every die needs known-good-die test;</text><text x="526" y="261" fill="#adb5bd" font-size="8.6">thermal coupling and interface</text><text x="526" y="273" fill="#adb5bd" font-size="8.6">ownership both get harder.</text><text x="526" y="297" fill="#f87171" font-size="8.6" font-weight="600">The package becomes the new</text><text x="526" y="309" fill="#f87171" font-size="8.6" font-weight="600">place system value is won or lost.</text><!-- ===== BOTTOM CARDS ===== --><rect x="20" y="384" width="226" height="70" rx="7" fill="#111a24" stroke="#30363d"/><text x="32" y="404" fill="#38bdf8" font-size="10.5" font-weight="700">Beat the walls</text><text x="32" y="421" fill="#adb5bd" font-size="8.7">The reticle limit and the yield curve</text><text x="32" y="434" fill="#adb5bd" font-size="8.7">drove the split: smaller dies dodge both</text><text x="32" y="447" fill="#adb5bd" font-size="8.7">and each can pick its own process node.</text><rect x="267" y="384" width="226" height="70" rx="7" fill="#111a24" stroke="#30363d"/><text x="279" y="404" fill="#a99cf0" font-size="10.5" font-weight="700">Right node per function</text><text x="279" y="421" fill="#adb5bd" font-size="8.7">Leading logic where it pays, mature</text><text x="279" y="434" fill="#adb5bd" font-size="8.7">I/O and analog where it doesn't &#8212; all</text><text x="279" y="447" fill="#adb5bd" font-size="8.7">stitched into one package. That's HI.</text><rect x="514" y="384" width="226" height="70" rx="7" fill="#111a24" stroke="#30363d"/><text x="526" y="404" fill="#f87171" font-size="10.5" font-weight="700">The package is the tax</text><text x="526" y="421" fill="#adb5bd" font-size="8.7">Link energy and latency, KGD test, and</text><text x="526" y="434" fill="#adb5bd" font-size="8.7">compounding assembly yield are the</text><text x="526" y="447" fill="#adb5bd" font-size="8.7">price paid for modularity.</text></svg>

Die-to-Die Interface Design

EDA Tool Challenges

System-Level Timing

• Die 1 output → D2D TX → bump → interposer → bump → D2D RX → Die 2 input.
• Total latency: ~2-10ns depending on interface (vs. ~0.1-0.5ns for on-die paths).
• Timing constraint: Must account for die-to-die latency + jitter + skew.
• Thermal variation: Each die at different temperature → different delay → cross-die OCV.

Emerging EDA Capabilities

Multi-die chiplet design methodology is the architectural paradigm that is replacing monolithic scaling as the primary path to more powerful chips — by decomposing complex systems into composable chiplets that can be independently designed, fabricated at optimal nodes, and combined through advanced packaging, the semiconductor industry is transcending the yield and cost limitations of monolithic die, making chiplet design competency the new essential skill for every chip architect and physical design team.