Physical Design for Freshers

Calculate setup arrival time, required time, and slack for a single register-to-register path.

Calculate hold arrival time, required time, and slack for a single register-to-register path.

Define a primary clock and verify that it reaches the intended sequential elements.

Constrain input and output interfaces using realistic external delay assumptions.

Model clock uncertainty, latency, transition, and generated clocks in SDC.

Classify timing paths into reg-to-reg, input-to-reg, reg-to-output, and input-to-output groups.

Interpret a PrimeTime timing report to locate the dominant cell, net, and constraint contributions.

Initialize an ICC2 design library using the supplied technology data, reference libraries, netlist, and constraints.

Configure functional modes and timing corners for multi-corner multi-mode analysis.

Use design checks to detect unresolved references, unconstrained paths, and inconsistent units.

Inspect the imported hierarchy, standard cells, clocks, and design attributes for correctness.

Create named checkpoints and restore a prior ICC2 design state.

Estimate core area from cell area, target utilization, and aspect ratio.

Create a floorplan with valid core boundaries, standard-cell rows, and routing space.

Place macros using connectivity, pin access, channel width, and hierarchy considerations.

Apply halos, placement blockages, routing blockages, and keepouts to control physical usage.

Construct a basic power-ring and power-mesh strategy for the practice design.

Verify power-ground connectivity and identify obvious power-grid discontinuities.

Run initial placement in ICC2 with an appropriate utilization and timing-driven configuration.

Evaluate a placement using timing, congestion, density, and design-rule reports.

Diagnose local congestion from cell density, macro channels, pin access, and routing demand.

Resolve pre-CTS maximum-transition, maximum-capacitance, and maximum-fanout violations.

Compare pre-CTS checkpoints to select the best timing-congestion trade-off.

Explain how clock latency, insertion delay, skew, transition, and duty cycle affect timing.

Configure allowed clock-tree cells, routing layers, non-default rules, and target constraints.

Run clock-tree synthesis in ICC2 and confirm that intended sinks are connected.

Interpret clock-tree reports for skew, latency, transition, depth, and design-rule violations.

Diagnose setup and hold regressions introduced by the synthesized clock tree.

Distinguish global routing, track assignment, and detailed routing outputs.

Configure signal-routing layers and routing constraints for the practice design.

Run detail routing and assess completion using route and congestion reports.

Locate and classify routing violations such as shorts, spacing errors, opens, and problematic vias.

Run post-route optimization and measure its effect on timing, design rules, and route quality.

Extract routed parasitics and associate them with the correct analysis corner.

Load the post-route netlist, constraints, libraries, and parasitics into PrimeTime.

Run multi-corner setup and hold analysis and summarize the worst violations by path group.

Determine whether a failing path is dominated by logic delay, interconnect delay, clock behavior, or an incorrect constraint.

Select an appropriate physical fix for a setup violation without relying on an invalid timing exception.

Select an appropriate physical fix for a hold violation without creating avoidable setup regressions.

Verify that a timing fix does not introduce new violations in other corners or path groups.

Distinguish the purposes of DRC, LVS, antenna, electrical-rule, and power-integrity checks.

Interpret common physical-verification violations and identify the stage responsible for fixing each one.

Explain how IR drop and electromigration risk influence power-grid and cell-placement decisions.

Formulate a minimal engineering change order for a reported timing or design-rule problem.

Implement a localized ECO in ICC2 while preserving unaffected placement and routing.

Perform a final handoff audit covering timing, physical checks, connectivity, reports, and output artifacts.

Organize the practice block as a reproducible project with scripts, checkpoints, reports, and a run guide.

Build a QoR summary comparing floorplan, placement, post-CTS, route, and signoff checkpoints.

Create a concise project presentation that explains the design, flow, constraints, results, and remaining limitations.

Diagnose a timed congestion scenario and justify a practical corrective action.

Diagnose a timed setup-or-hold scenario and justify a practical corrective action.

Explain key physical-design trade-offs clearly in a mock technical interview.

Convert the project work into evidence-based physical-design resume bullets.

Prepare structured answers for common fresher questions about ASIC flow, STA, floorplanning, CTS, routing, and closure.