24 transientsCasesUNKNOWNInspect metric contract
18 pass / 6 failPass / failUNKNOWNInspect metric contract
1.2 -> 1.0 V WLAssist boundaryUNKNOWNInspect metric contract
SIMULATION / SKY130_SRAM_WRITE_BOUNDARY_001
SRAM write-boundary simulation
SRAM Write Boundary
Replay the 24-case SKY130 shmoo that maps dynamic write success versus wordline level and write-VDD assist.
EXPLORE
Start with the observable.
Use this page when the simulation is the primary artifact. The linked lesson explains the concept; the linked lab keeps the visual replay surface available.
- Compare each wordline level against each write-VDD assist level.
- Open representative pass and fail waveforms before reading the boundary.
- Use the pass condition to separate dynamic write success from static SNM.
RUN CARD
Conditions before conclusions.
The current site replays saved 24-case evidence; new shmoo execution remains offline.
Primary knobs
- Wordline levels: 0.8 V to 1.8 V
- Write-VDD assist: 1.8 V, 1.6 V, 1.4 V, 1.2 V
- Initial state: Q=1, QB=0 before write
- Decision time: 7.5 ns after supply restoration
Saved outputs
- pass/fail shmoo
- representative waveforms
- minimum successful wordline by assist
- summary CSV
EXPORT
Download the public artifacts.
These exports are the supported public files for review. PDK files and restricted third-party material are not redistributed.
Dataset JSON
/data/sky130-sram-write-boundary-web-v1.json
Open file ->Summary CSV
/data/write-boundary-summary.csv
Open file ->Run script
/data/run_write_shmoo.py
Open file ->Verification script
/data/verify_write_shmoo.py
Open file ->Reproduction script
/data/reproduce_write_shmoo.sh
Open file ->Source notes
/data/SOURCE_NOTES_WRITE.md
Open file ->METHODS
How the number was made.
Methods are written for citation discipline: the extraction rule matters as much as the plotted value.
Execute a transient case for each wordline and assist pair.
Keep this method attached when reusing the figure or metric.
Classify success using the published final-node voltage rule.
Keep this method attached when reusing the figure or metric.
Summarize the minimum successful wordline voltage at each assist level.
Keep this method attached when reusing the figure or metric.
Preserve scripts, netlists, waveform samples, and source notes together.
Keep this method attached when reusing the figure or metric.
LIMITS
What this page does not claim.
The MVP is useful because the limits are visible. These statements prevent a teaching simulation from being cited as silicon evidence.
Educational pre-layout SRAM result; not a silicon yield or production macro claim.
Carry this boundary into any derivative note, paper draft, or slide.
No mismatch, PVT sweep, extracted parasitics, bitcell characterization deck, or write-driver model.
Carry this boundary into any derivative note, paper draft, or slide.
Dynamic write success is not the same metric as WSNM.
Carry this boundary into any derivative note, paper draft, or slide.
PDK files are not redistributed by SemiAgora.
Carry this boundary into any derivative note, paper draft, or slide.
EVIDENCE
Trace the claim back to artifacts.
The evidence route remains the catalog-level browser; this page is the simulation-level reading card.
Verification records 24 cases, all converged, and mixed pass/fail regions.
SKY130_SRAM_WRITE_BOUNDARY_001
Boundary is monotonic with assist in the saved evidence payload.
SKY130_SRAM_WRITE_BOUNDARY_001
The lesson packet and worksheet keep the pass condition visible.
SKY130_SRAM_WRITE_BOUNDARY_001
Public execution boundary
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