wafer.space Community

New tapeout: Shlomo Abrams submitted Asynchronous FIFO (https://github.com/ShlomoAbrams/tt-fifo)

Contribute to ShlomoAbrams/tt-fifo development by creating an account on GitHub.

New tapeout: neev-shah-s22 submitted AquaFuse-1: fish-presence wake gate (https://github.com/neev-shah-s22/aquafuse1-tt)

GitHub - neev-shah-s22/aquafuse1-tt: AquaFuse-1: sensor-direct fish...

AquaFuse-1: sensor-direct fish-presence wake gate for Tiny Tapeout SKY130 (8x4) - neev-shah-s22/aquafuse1-tt

New tapeout: @Leo Moser (mole99) submitted Tiny FABulous FPGA (BOAT 26 version) (https://github.com/mole99/tt-fabulous-boat-26)

GitHub - mole99/tt-fabulous-boat-26: A tiny FABulous FPGA for BOAT 26

A tiny FABulous FPGA for BOAT 26. Contribute to mole99/tt-fabulous-boat-26 development by creating an account on GitHub.

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New tapeout: @tnt submitted tnt's variant of GF180mcu mini-MOSbius (https://github.com/smunaut/ttgf-mini-mosbius)

GitHub - smunaut/ttgf-mini-mosbius: tnt's take on Mini-MOSbius port...

tnt's take on Mini-MOSbius ported to GF180mcu TT shuttles - smunaut/ttgf-mini-mosbius

New tapeout: @RebelMike submitted TinyQV Risc-V SoC (https://github.com/MichaelBell/ttboat26-tinyQV)

GitHub - MichaelBell/ttboat26-tinyQV: TinyQV - Crowdsourced Risc-V ...

TinyQV - Crowdsourced Risc-V SoC for TT Best of all Time '26 - MichaelBell/ttboat26-tinyQV

New tapeout: Ihsan Salari submitted Charge-Pump PLL (https://github.com/ihsan-sa/ece298a-pll)

GitHub - ihsan-sa/ece298a-pll: ECE 298A charge-pump PLL (Tiny Tapeo...

ECE 298A charge-pump PLL (Tiny Tapeout, GF180MCU). Contribute to ihsan-sa/ece298a-pll development by creating an account on GitHub.

New tapeout: Amishi, Keshav submitted TCPU_8 (https://github.com/keshav-off/CPU8_LNMIIT_01_gf)

GitHub - keshav-off/CPU8_LNMIIT_01_gf: Submission template for Tiny...

Submission template for Tiny Tapeout GF180 (wafer.space) shuttles - Verilog HDL Projects - keshav-off/CPU8_LNMIIT_01_gf

New tapeout: Rishabh Agrawal, Ankit Mawle submitted CL4_LNMIIT_05 (https://github.com/Rishabh-ece/CL4_LNMIIT_05_gf)

GitHub - Rishabh-ece/CL4_LNMIIT_05_gf: Submission template for Tiny...

Submission template for Tiny Tapeout GF180 (wafer.space) shuttles - Verilog HDL Projects - Rishabh-ece/CL4_LNMIIT_05_gf

New tapeout: Maohan Sun submitted RO array for variation and BTI aging (https://github.com/maohansun/-tt-gf180-ro-aging)

GitHub - maohansun/-tt-gf180-ro-aging: Ring-oscillator array for pr...

Ring-oscillator array for process variation and BTI aging on GF180MCU - maohansun/-tt-gf180-ro-aging

✅ mattvenn reported @algofoogle (Anton Maurovic)'s Ring osc on VGA as working: The rings run from 23.7 MHz (161 stages) to 220.5 MHz (3 stages); the fixed 5× inv_1 ring runs at about 320 MHz. Period fits T = 0.240 ns × N + 4.19 ns: about 120 ps per inv_2 stage (T = 2·N·t_pd) plus about 4.2 ns fixed loop overhead (tap multiplexer and clock buffer). uio[1] (clksel2[1]) wasn't working so we couldn't test the 5 × inv_4 ring

614 Ring osc on VGA - Tiny Tapeout

VGA display visualisation of a ring oscillator doing work

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smunaut reported @urish's Oscillating Bones as partially working: It oscillates at 127 MHz however it's not visible on the digital pins at all. The load from the analog external connection on the output inverter is too great, reducing the amplitude greatly and it's not enough for the digital logic that follows. You can see a tiny ( ~ 100 mV ) signal on the analog pin . If you inject an external bias through that pin to put it in the "right" zone, you can get some life out of the digital divider but barely and inconsistent.

294 Oscillating Bones - Tiny Tapeout

A stylish SkullFET ring oscillator (~120 MHz) with an 8-bit /2../256 divider

✅ smunaut reported @tnt's tnt's recreation of a 555 on GF180mcu as working: Works as designed. Both the one exposed entirely on external pins and the one configured as on-chip oscillator. The on-chip one is around 975 kHz and 67% duty cycle. I tested the external one using 4.7n cap, 0.5k / 1k resistors and got 151 kHz at 72.7% duty cycle.

103 tnt's recreation of a 555 on GF180mcu - Tiny Tapeout

Just a simple classic timer IC re-imagined

✅ smunaut reported @algofoogle (Anton Maurovic)'s algofoogle analog stuff as working: Seems to work fine. Tested only the analog VCO control since there was no instructions for the DAC controlled one. Oscillates ( very slowly ) even at 0V. About 1.4 MHz at 0.55V. 167 MHz at 1.5V and roughtly 416 MHz at 3.3V.

37 algofoogle analog stuff - Tiny Tapeout

Some analog and custom layout experiments in gf180mcuD for ttgf0p3 (the TT GF 1st analog experimental shuttle)

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✅ smunaut reported @Matt Venn's GF R2R DAC as working: Works ( tested the sine generator mode ). Shows ~ 3 LSBs non-monotonicity in the middle of the range.

35 GF R2R DAC - Tiny Tapeout

8 bit R2R DAC

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✅ smunaut reported @htamas's MoM capacitor as working: Measured at 112 pF . Measure setup is looking at the time to rise to 2.5V through a 47k resistor and compare the dummy terminal vs the active terminal. Dummy measured at 38.7 pF and Active measured at 151.6 pF

39 MoM capacitor - Tiny Tapeout

Simple metal-oxide-metal capacitor for gf180mcuD that fills an analog 1x2 tile

✅ smunaut reported @tnt's Quadrature VCO as working: Seems to work. 2.0V gives 120 MHz, 2.5V = 240 MHz, 3.3V = 317 MHz. Measuring phase between quadrature outputs shows 90 deg difference ( measured at ~ 30 MHz since higher freq are too distorted ).

262 Quadrature VCO - Tiny Tapeout

Quadrature VCO with nominal target frequency of 240 MHz

TTBot

✅ smunaut reported @tnt's Quadrature VCO as working: Seems to work. 2.0V gives 120 MHz, 2.5V = 240 MHz, 3.3V = 317 MHz. Measuring phase between quadrature outputs shows 90 deg difference ( measured at ~ 30 MHz since higher freq are too distorted ).

@tnt phase noise future when [probably not this week]....? https://www.youtube.com/watch?v=SOHjFtw0sgo .... for the frequencies you're dealing with, I think a pair of RTL-SDR's should actually be able to do it? I'm guessing there's some gnuradio or mayhaps more-dedicated DSP bundle around that can do the mentioned carrier lock, carrier-surpression, cross-correlation steps. Not gonna do too well, but I can't expect that ASIC VCO to be hard-to-measure levels of low-phase-noise.

The Signal Path

TSP #161 - Tutorial on Theory, Characterization & Measurement Techn...

I expect it to be abysmal because of noise on the Vctl line. I should have put some on-die filtering ...

oh. oh noes. just two itty bitty gate fingers and their paired-up (at least more than one contact!) via stack up and out to the analog mux..... Though.... why should it be that noisy? T-gates aren't big noise sources, or are they actually?

More like PCB traces and stuff acting as antenna ... (edited)

New tapeout: Aram Yun submitted tiny-sparse-acc (https://github.com/ramzxc/tiny-sparse-acc-gf180)

GitHub - ramzxc/tiny-sparse-acc-gf180

Contribute to ramzxc/tiny-sparse-acc-gf180 development by creating an account on GitHub.