{"id":42588,"date":"2026-09-29T06:51:10","date_gmt":"2026-09-29T06:51:10","guid":{"rendered":"https:\/\/chipedge.com\/resources\/?p=42588"},"modified":"2026-09-29T06:51:10","modified_gmt":"2026-09-29T06:51:10","slug":"physical-design-flow-in-vlsi-multiple-power-domains","status":"publish","type":"post","link":"https:\/\/chipedge.com\/resources\/physical-design-flow-in-vlsi-multiple-power-domains\/","title":{"rendered":"How Physical Design Flow in VLSI Adjusts When Working with Multiple Power Domains"},"content":{"rendered":"

A standard <\/span>physical design flow<\/a><\/strong> gets meaningfully more complicated the moment a chip has more than one independently controllable power domain. Floorplanning decisions, placement strategies, clock tree synthesis, and timing closure all need to account for domain boundaries that simply don’t exist in a single-power-domain design.<\/span><\/p>\n

Why Multiple Power Domain Designs Add Complexity to the Standard Physical Design Flow<\/b><\/h3>\n

Multiple power domains exist specifically so that different parts of a chip can be powered down independently to save energy when they’re not needed. This is genuinely valuable from a power perspective, but it introduces physical boundaries within the chip that every stage of the physical design flow now needs to respect, since signals crossing between domains, and the special cells required to handle those crossings safely, didn’t exist in the simpler single-domain case.<\/span><\/p>\n

How Floorplanning Changes When a Chip Has Multiple Independent Power Domains<\/b><\/h3>\n

Power Domain Boundary Planning<\/b><\/h4>\n

Floorplanning for a multi-domain chip needs to establish clear physical boundaries between domains early, since cells belonging to different domains generally cannot be freely intermixed the way they could in a single-domain design. This boundary planning directly shapes the overall floorplan layout in ways that a single-domain design never needs to consider.<\/span><\/p>\n

Level Shifter Placement<\/b><\/h4>\n

Signals crossing between domains operating at different voltage levels need level shifter cells to safely convert the signal from one voltage domain to another. Planning where these level shifters sit physically, generally near the domain boundary, is an additional floorplanning consideration that adds real complexity to what would otherwise be a more straightforward placement decision.<\/span><\/p>\n

How Placement Strategies Adapt to Respect Power Domain Boundaries<\/b><\/h3>\n

Standard cell placement in a multi-domain design needs to keep cells within their assigned power domain’s physical region, which constrains the placement tool’s freedom compared to a single-domain design where any cell can theoretically go almost anywhere that makes sense for timing and congestion. This added constraint sometimes makes it harder to achieve the same placement quality, in terms of timing and congestion, that a single-domain design with full placement freedom could achieve.<\/span><\/p>\n

How Clock Tree Synthesis Handles Multiple Power Domains Differently<\/b><\/h3>\n

Domain Specific Clock Trees<\/b><\/h4>\n

Each power domain often needs its own clock tree structure, since a domain that gets powered down needs its clock distribution to behave correctly during power-down and power-up transitions, which a single shared clock tree spanning multiple domains would handle poorly. Building and balancing separate clock trees per domain, while still maintaining acceptable overall clock skew where domains do need to interact, adds real complexity to the clock tree synthesis stage.<\/span><\/p>\n

Isolation Cell Considerations<\/b><\/h4>\n

Isolation cells, which clamp signals from a powered-down domain to a known, safe value rather than letting them float unpredictably, need to be correctly placed and connected, including on clock paths that cross domain boundaries. Getting this wrong can cause real functional issues that only show up when a domain actually gets powered down during operation, which can be a difficult failure mode to catch if verification doesn’t specifically test for it.<\/span><\/p>\n

How Routing Becomes More Complex with Multiple Power Domains in the Design<\/b><\/h3>\n

Routing in a multi-domain design needs to correctly connect the additional power network structure required to independently control each domain, including the power switches that enable and disable power to each domain, while also routing the level shifter and isolation cell connections at domain boundaries without introducing excessive parasitic delay on these already-sensitive crossing paths. This generally increases overall routing complexity and can introduce additional routing congestion specifically near domain boundary regions.<\/span><\/p>\n

What Additional Verification Steps Are Needed for Multi Power Domain Physical Designs<\/b><\/h3>\n

Physical verification<\/span><\/a> for multi-domain designs needs to specifically confirm that isolation and level shifter cells are correctly placed and connected at every domain boundary crossing, and that the power switch network correctly enables and disables each domain as intended. This is verification that simply doesn’t apply to a single-domain design and requires specific tool support and specific engineering attention to do correctly.<\/span><\/p>\n

How Timing Closure Is Affected by Power Domain Crossings<\/b><\/h3>\n

Timing analysis across power domain boundaries needs to account for the additional delay that level shifters and isolation cells introduce, and needs to correctly model the different operating conditions each domain might be in, since a domain that’s sometimes powered down introduces timing scenarios that a single-domain design never needs to consider. This generally adds real complexity to the timing closure process, requiring engineers to verify timing not just for the chip’s fully powered-on state but across the various combinations of domain power states the design needs to support.<\/span><\/p>\n

What Tools and Techniques Help Manage Multi Power Domain Physical Design Flow<\/b><\/h3>\n

Synopsys ICC2 provides specific support for power-aware physical implementation, reading the UPF power intent specification and using it to guide correct placement of power-aware cells like level shifters, isolation cells, and power switches throughout the implementation flow. Engineers working on these designs need genuine hands-on familiarity with how UPF gets used throughout the physical implementation tools, not just a conceptual understanding of what power domains are.<\/span><\/p>\n

How This Added Complexity Affects Project Timelines and Engineer Skill Requirements<\/b><\/h3>\n

Multi-power-domain <\/span>physical design<\/a><\/strong> projects generally take longer to close than equivalent single-domain designs, simply because there’s more to get right and more verification steps required to confirm it’s actually correct. Engineers working on these projects need genuine, specific experience with power-aware implementation, beyond standard physical design skills, and this experience gap is exactly why multi-domain expertise tends to be valued distinctly in the job market rather than being assumed as a given within general physical design competence.<\/span><\/p>\n

How to Build Expertise in Multi Power Domain Physical Design as a Career Specialization<\/b><\/h3>\n

Develop strong general physical design fundamentals first, then seek out specific training or project experience with UPF-based power intent and the specific physical implementation techniques multi-domain designs require, ideally through hands-on project work on a design that genuinely includes multiple power domains rather than only reading about the concept abstractly. This combination of general physical design competence plus genuine multi-domain experience positions engineers well for the growing number of mobile, IoT, and other power-constrained chip projects that increasingly define where physical design work is concentrated across the industry.<\/span><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

A standard physical design flow gets meaningfully more complicated the moment a chip has more than one independently controllable power 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