Tiny Tapeout GF 26a · Die T26A on wafer.space Run 2
BIST-8: Built-In Self-Test for 8-bit CLA Adder
484 · Other digital · 1 × 1 tile
by Mario Garcia Jimenez · repository @mgarciajimenezAirzone
Rendered from the layout at 0.33 µm per pixel. Layers: NwellDiffusionPolysiliconMetal 1Metal 2Metal 3Metal 4Metal 5Top metalPad openings
325 logic cells: too few for density figures, which are given for projects of 1,000 or more.
Every figure here is measured from the public layout, the same way for every design on the chip: see data and method, and how its designs used the process.
BIST architecture for an 8-bit Carry-Lookahead Adder. Includes 12-bit LFSR pattern generator, 16-bit MISR response compactor, fault injection and 4-state FSM controller. Golden signature 0xCF77.
Source repository Its page on Tiny TapeoutBuy a chip and board
| Size | 347 × 161 µm (0.056 mm²) |
|---|---|
| Macro | tt_um_mgj_bist8 |
| Files | documentation · licence · layout and netlist in Tiny Tapeout GF 26a |
| Tiles | 1 × 1 at column 6, row 16 of the tile grid |
| Mux address | 484 |
| Language | Verilog |
| Clock | 10 MHz |
| Built with | LibreLane 3.0.3, open_pdks 54435919abff |
| Transistors | 12,510 |
| Logic cells | 325 + 1,430 filler and tap cells |
| Libraries | 7t-5V (325) |
| 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 project's area splits between logic cells, filler and tap cells and other.
- Logic cells 0.01 mm² (17%)
- Filler and tap cells 0.04 mm² (76%)
- Other 4,033 µm² (7%)
Most used cells
The ten standard cells this design uses most.
| Cell | Library | Instances | What it does |
|---|---|---|---|
| clkinv_1 | 7t-5V | 39 | Clock inverter |
| dffrnq_1 | 7t-5V | 39 | D flip-flop with reset |
| dlyb_1 | 7t-5V | 28 | Delay buffer |
| aoi22_1 | 7t-5V | 26 | AND-OR-Invert (2x2 inputs) |
| buf_2 | 7t-5V | 24 | Buffer (2x drive) |
| nand2_1 | 7t-5V | 24 | 2-input NAND gate |
| clkbuf_2 | 7t-5V | 17 | Clock buffer (2x drive) |
| nor2_1 | 7t-5V | 17 | 2-input NOR gate |
| aoi21_1 | 7t-5V | 15 | AND-OR-Invert compound gate |
| oai21_1 | 7t-5V | 10 | OR-AND-Invert compound gate |
Tiny Tapeout and wafer.space are independent companies that work together (announcement). Tiny Tapeout runs its own shuttles: it takes the projects, builds the die, and sells and supports the chips and boards. wafer.space has the dies manufactured on its GF180MCU runs, and these pages are wafer.space's measurements of them. For anything about a Tiny Tapeout project, chip or order, contact Tiny Tapeout.