Google GF180MCU open shuttle (GFMPW‑0) · Run by Google and Efabless
OpenFASoC test structures in GF180MCU
F4D8 · Test structures · 1 × 1 slot
Rendered from the layout at 2.5 µm per pixel. Layers: NwellDiffusionPolysiliconMetal 1Metal 2Metal 3Metal 4Metal 5Top metalPad openings
727 logic cells: too few for density figures, which are given for designs of 1,000 or more.
Every figure here is measured from the public layout, the same way for every design on the run: see data and method, and how its designs used the process.
OpenFASoC test structures.
Source repository Die photograph
| Die | 3.93 × 5.12 mm (20.1 mm²) |
|---|---|
| Core area | 9.00 mm² inside the pad ring
its user_project_wrapper cell |
| Placements | 1 on the reticle, in slot D1 |
| Bond pads | 63 |
| Transistors | 109,729 |
| Logic cells | 727 + 15,874 filler and tap cells |
| Libraries | 7t-5V (727) |
| SRAM | No SRAM |
Process features
Which parts of the GF180MCU process this design uses: its transistor voltages and where they come from, its gate oxides, and any devices drawn by hand outside the standard cells, SRAM and pads.
| 5 V | 7t-5V standard cells |
|---|---|
| Gate oxides | Thick only (5 V/6 V) in the design itself |
Where the area went
How this design's area splits between logic cells, filler and tap cells, other and outside the user area.
- Logic cells 0.02 mm² (<1%)
- Filler and tap cells 0.49 mm² (2%)
- Other 8.49 mm² (42%)
- Outside the user area 11.12 mm² (55%)
Most used cells
The ten standard cells this design uses most.
| Cell | Library | Instances | What it does |
|---|---|---|---|
| clkbuf_1 | 7t-5V | 245 | Clock buffer |
| clkbuf_4 | 7t-5V | 134 | Clock buffer (4x drive) |
| nor2_1 | 7t-5V | 79 | 2-input NOR gate |
| dffq_1 | 7t-5V | 49 | D flip-flop (1 bit storage) |
| aoi21_1 | 7t-5V | 25 | AND-OR-Invert compound gate |
| mux2_2 | 7t-5V | 21 | 2-input multiplexer (2x drive) |
| nand2_1 | 7t-5V | 20 | 2-input NAND gate |
| aoi222_1 | 7t-5V | 19 | AND-OR-Invert (2x2x2 inputs) |
| dffq_2 | 7t-5V | 16 | D flip-flop (1 bit storage, 2x drive) |
| xor2_1 | 7t-5V | 15 | 2-input XOR gate |
The fabricated die
A photograph of the finished chip, taken through a microscope after manufacture: optical micrograph © 2025 John McMaster, CC BY 4.0
