UCIe & Chiplet Connectivity
Your chiplet program lives or dies on die-to-die interop.
Monolithic dies hit reticle limits. Chiplet partitioning restores scalability — but only if the dies can talk reliably at the package with the bandwidth density your product needs.
Package
Compute die
UCIe interface
die-to-die links
Custom Chip-to-Chip & Die-to-Die
(program-specific)
(program-specific)
UCIe interface
I/O die
UCIe interface
die-to-die links
UCIe interface
memory-related die(where applicable)
substrate / interposer
standard vs. advanced packaging
package pins — board (PCIe, Ethernet ports...)
Partitioning only works if the dies talk — at package-level bandwidth density.
UCIe: the standardized die-to-die ecosystem.
UCIe defines the common electrical and protocol foundation that lets different dies communicate.
It gives you a shared definition, link initialization, and a compliance framework — not interoperability.
Die A
Die B (Partner die)
Protocol layer
PCIe · CXL · streaming mapping
Die-to-Die Adapter
link state management · parameter exchange · CRC/retry
PHY
electrical, mainband lanes + sideband
sideband
Protocol layer
PCIe · CXL · streaming mapping
Die-to-Die Adapter
link state management · parameter exchange · CRC/retry
PHY
electrical, mainband lanes + sideband
Working interop with your partner's die
Configuration choices
Packaging co-design
Specification compliance
System integration
Verification of open-spec areas
Compliance ⊂ Interop
Everything in the ring is engineering the spec leaves to you.
Custom die-to-die links .
UCIe isn't the answer when both dies are yours and you need extreme latency, area, or power budgets — or when your packaging dictates a different path.
Need multi-vendor interop?
Yes →
UCIe
ecosystem, compliance
framework
Evaluate the Custom Chip-to-Chip & Die-to-Die path against these
criteria:
- Latency: cut below adapter overhead?
- Area/beachfront: bump map tighter than UCIe?
- Power: pJ/bit below standard config?
- Bandwidth/shoreline: density targets?
- Verification burden: own 100% — no compliance backstop?
- Packaging: substrate/interposer constrains PHY?
If mostly yes
↓
Custom Custom Chip-to-Chip & Die-to-Die (program-specific)
Otherwise ↓
UCIe (or UCIe streaming mode)
The trade is ecosystem compatibility for optimization — priced in verification you now fully own.
Where SNOVA contributes
Chiplet interconnect architecture
UCIe vs. custom trade-off analysis, packaging-aware partitioning, and interface planning that scales.
Design & integration
Adapter and link-layer logic design, PHY configuration, and SoC integration across heterogeneous chiplets.
Custom Custom Chip-to-Chip & Die-to-Die engineering
Specification, RTL/firmware, physical-aware design, and verification of program-specific die-to-die links.
Compliance & interoperability verification
UCIe compliance test planning, interop strategy, and coverage closure across partner dies.
Why chiplets, why now?
AI accelerators are the forcing function. HBM, advanced packaging, and domain-specific chiplets unlock performance and cost curves monoliths can't reach. Chiplets let you mix best-of-breed IP, scale on your terms, and buy what's already proven.