130 Tiny Tapeout Template

130 : Tiny Tapeout Template

Design render

How it works

A 4-bit down counter is a digital circuit that counts backward in binary from 1111 (decimal 15) down to 0000 (decimal 0). It consists of four flip-flops, each holding one bit of the binary number: Q3 is the most significant bit and Q0 is the least significant bit. Every time a clock pulse arrives, the counter subtracts one from its current value. The outputs change in a fixed sequence: 1111 → 1110 → 1101 → … → 0001 → 0000, and then it returns to 1111 again.

How to test

I dunno, if it counts downwards from F-0 it works

External hardware

7 segment display

IO

#InputOutputBidirectional
0I0O0
1I1O1
2I2O2
3I3O3
4I4O4
5I5O5
6I6O6
7I7O7

Chip location

Controller Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Analog Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux Analog Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux tt_um_chip_rom (Chip ROM) tt_um_factory_test (Tiny Tapeout Factory Test) tt_um_oscillating_bones (Oscillating Bones) tt_um_sonos_flash_party (SONOS Flash Party) tt_um_tinyflash (Tiny Chaos) tt_um_tnt_rf_test (TTSKY25A Register File Test) tt_um_wokwi_442983115801432065 (TimosChip) tt_um_wokwi_442977603880750081 (My first Wokwi project) tt_um_wokwi_442980274206980097 (Lauflicht_HTL_Leonding) tt_um_wokwi_442985235137668097 (Chip) tt_um_wokwi_442977476137901057 (Paircheck) tt_um_seven_segment_games (7-segment-games) tt_um_wokwi_442977465750697985 (Auberger tiny tapeout) tt_um_wokwi_442983567899298817 (Template copy) tt_um_wokwi_442977846716359681 (Tiny Tapeout) tt_um_wokwi_442983760106473473 (Tiny Tapeout Test) tt_um_Max00Ker_Traffic_Light (Traffic Light Controller) tt_um_wokwi_442983721200099329 (Piffl first Wokwi project) tt_um_strasti (8-Bit ALU) tt_um_wokwi_442977509323262977 (simple adder and subtractor) tt_um_wokwi_442977852139597825 (The Ultimate ASIC) tt_um_wokwi_442984105081776129 (Test project) tt_um_wokwi_442977495241922561 (First Wokwi design) tt_um_wokwi_442977534651634689 (Tiny Tapeout Wokwi Bsp) tt_um_pwm_led_top (PWM_LED_dimmer) tt_um_classic_vga_clock (tt_classic_vga_clock_by_TT) tt_um_wokwi_442977463421808641 (Patrick first TT chip) tt_um_wokwi_442983748797580289 (Simple Logic-Gate Controlled LEDs) tt_um_timba307_LEDSpinner (jku-sky-LEDSpinner) tt_um_wokwi_442977533467790337 (4 Bit Counter) tt_um_wokwi_442977645972707329 (Davids first Wokwi design) tt_um_wokwi_442977436543634433 (2 Bit Counter) tt_um_wokwi_442977452121292801 (Shift_Register) tt_um_wokwi_442976058838162433 (7segCounter) tt_um_wokwi_442977493563151361 (7SegDec) tt_um_Lukasseirl (Tiny_Tapeout_Scoreboard) tt_um_dip_switch_game_TobiasPfaffeneder (Can you count binary?) tt_um_wokwi_442977704392041473 (test-project.) tt_um_wokwi_442984054310760449 (TinyTapeout Wokwi) tt_um_cpu_fabianp1704 (8-Bit-CPU) tt_um_wokwi_442977579441572865 (Hamming (7,4) Encoder and Decoder) tt_um_wokwi_442977842875423745 (Tiny Tapeout) tt_um_wokwi_442977476963131393 (Test) tt_um_s_grundner (Polyphonic MIDI-Synth) tt_um_wokwi_442987128372461569 (counter7seg) tt_um_wokwi_442977648674888705 (tt-test) tt_um_wokwi_442977792040445953 (tiny tapeout test gates) tt_um_lukasdragoste_vga_patterns (VGA Pattern Generator) tt_um_wokwi_442983161563395073 (tt_primitiv_rotating_7segment) tt_um_attention_top (transformer-attention-engine) tt_um_wokwi_442977515486800897 (Austrochip 2025 Tiny Tapeout Project) tt_um_endecoder_workfefra (EnDecoder) tt_um_wokwi_442977774857423873 (first-chip-project) tt_um_wokwi_442983487202965505 (EmilsChip) tt_um_wokwi_442984104166367233 (Austrochip 2025 Workshop Design) tt_um_wokwi_442978797853619201 (Full Adder) tt_um_wokwi_442983541057844225 (First Wokwi design) tt_um_df_top (Digital Filter) tt_um_tiny_4bit_alu (4-Bit ALU) tt_um_wokwi_442987944543304705 (Lauflichterweitung) tt_um_rebeccargb_universal_decoder (Universal Binary to Segment Decoder) tt_um_rebeccargb_hardware_utf8 (Hardware UTF Encoder/Decoder) tt_um_rebeccargb_intercal_alu (INTERCAL ALU) tt_um_rebeccargb_vga_pride (VGA Pride) tt_um_wokwi_442987201599784961 (Tiny tapeout test gates) tt_um_wokwi_442977606409919489 (Tiney Tapeout Test Gates) tt_um_wokwi_442977490552687617 (Tiny Tapeout Projekt) tt_um_wokwi_442987575358494721 (Tiny Tapeout Template) tt_um_wokwi_442987960046504961 (Lauflicht_Erweiteung_HTL_LEONDING) tt_um_urish_simon (Simon Says memory game) tt_um_FG_TOP_Dominik_Brandstetter (Function Generator) tt_um_vga_clock (VGA clock) tt_um_z2a_rgb_mixer (RGB Mixer demo) tt_um_felixzhou_spi_slave_ctrl (spi_slave_ctrl) tt_um_Jsilicon (Jsilicon) tt_um_wokwi_413387009513254913 (SimplePattern) tt_um_wokwi_445165988923203585 (Crazy logic gates) tt_um_wokwi_445172771884208129 (TinyTapeoutProject) tt_um_wokwi_445163720250008577 (base-4-circuit-addition) tt_um_wokwi_445163803460843521 (tiny tapeout) tt_um_wokwi_445163742018450433 (Simon Memory Game) tt_um_wokwi_445163652263454721 (Minhala's tinytapeout) tt_um_wokwi_445163607540610049 (Leena and Gabby's coding masterpiece) tt_um_wokwi_445163940815949825 (doritos) tt_um_wokwi_445164514940747777 (DAMTinyTape) tt_um_wokwi_445163656445179905 (Test) tt_um_wokwi_445163922612663297 (Chip Design (Working title)) tt_um_wokwi_445171727534897153 (FlippyFlop) tt_um_wokwi_445172053537213441 (Chip-Test) tt_um_wokwi_445163628668378113 (4 switch, seven segment display) tt_um_wokwi_445174163497792513 (T Flip Flop) tt_um_wokwi_445164196289996801 (Tiny Tapeout Test Gates) tt_um_wokwi_445165735970991105 (tiny tapout test gates) tt_um_wokwi_445163669892121601 (Nicky - Tiny Tapeout) tt_um_wokwi_445163874814362625 (Tiny Tapeout Test Gates) tt_um_wokwi_445163790648286209 (AnalogClockTest1) tt_um_wokwi_445173979376212993 (EJ Wokwi proj.) tt_um_wokwi_445172860504617985 (Tiny_Tapeout_Test_Gates) tt_um_wokwi_445163677488010241 (Bob design) tt_um_wokwi_445171420903985153 (Fawwaz's Project) tt_um_wokwi_445256090314494977 (Tiny Tapeout Hackathon UofT Day 2 Template) tt_um_wokwi_445254767859645441 (flipper 1 to 5) tt_um_wokwi_445256131623154689 (Tiny tapeout test gates) tt_um_wokwi_445254731311517697 (Single Digit Sums by Mark Angelov) tt_um_wokwi_445255383410583553 (Overly Complicated Light Switch) tt_um_wokwi_445254813154997249 (Tiny Tapeout Gates) tt_um_wokwi_445255110472500225 (chipchip) tt_um_wokwi_445255067501843457 (Semi-Conductor Design) tt_um_wokwi_445254767711795201 (WOKWI Design - Joelle) tt_um_wokwi_445254845860088833 (Johans Wokwi design) tt_um_wokwi_445254714007910401 (Arjun's 1st Wokwi design) tt_um_wokwi_445254980988014593 (Tiny Tapeout Test Gates) tt_um_wokwi_445254976953093121 (Inverting Numbers) tt_um_wokwi_445254908700218369 (Tinytapeoutchipnikki) tt_um_wokwi_445254867374774273 (Hardware Hackday Test Gates) tt_um_wokwi_445255496359022593 (gds) tt_um_wokwi_445265377104476161 (WokwiDesign) tt_um_wokwi_445256528755654657 (sigma uncount) tt_um_wokwi_445255578007454721 (Tiny Tapeout Test Gates) tt_um_wokwi_445265925317879809 (tinytapeout) tt_um_wokwi_445260761196909569 (Tiny Tapeout Template Copy) tt_um_wokwi_446565876953355265 (Tiny Tapeout Project - Binary to Decimal Display) tt_um_wokwi_445255326319805441 (Svens Woki design) tt_um_wokwi_445255081544375297 (Tiney Tapeout Semiconduxtor) tt_um_wokwi_445266058506969089 (Wowki) tt_um_wokwi_445262455513487361 (Tiny Tapeout Test Games) tt_um_wokwi_445264784091688961 (Wokwicreation) tt_um_wokwi_445276353959823361 (Jarle Chip) tt_um_wokwi_444910895295771649 (Project Title) tt_um_wokwi_445263189281882113 (FullAdder) tt_um_wokwi_445254953748100097 (Tiny Tapeout Test Gates) tt_um_wokwi_444269677791635457 (Ring Counter) tt_um_rebeccargb_arrow_board (Arrow Board) tt_um_sergejsumnovs_spi_slave (Cynergy4MIE SPI Slave Component) tt_um_rebelmike_femtorv (FemtoRV register file test) tt_um_wokwi_445163733427466241 (my first wokwi design) tt_um_tnt_rf_validation (TTSKY25B Register File Validation) tt_um_pongsagon_tinygpu_v2 (Tiniest GPU V2) tt_um_rc_servo_motor_xy_ea (rc_servo_motor_xy) tt_um_htfab_asicle2 (Asicle v2) tt_um_dumb_turing_yliu_hashed (DUMB-Turing) tt_um_wokwi_446363696828310529 (sparkhom SR flip flop) tt_um_wokwi_446364165240923137 (TinyTapeout) tt_um_wokwi_446645853372820481 (JBs first chip) tt_um_wokwi_446907838117673985 (miloh-tinytapeout-supercon2025) tt_um_wokwi_446363880417243137 (test) tt_um_wokwi_446363782054494209 (4-bit Johnson Counter) tt_um_wokwi_446847576277095425 (Tiny Tapeout 20251031) tt_um_wokwi_446363829539267585 (AndNand) tt_um_wokwi_446363784753530881 (LeviathonGds) tt_um_wokwi_446363928119066625 (mysteryform) tt_um_wokwi_447138553926768641 (Digit Fidgit) tt_um_6502_chip_select (6502 Chip Selector) tt_um_wokwi_446363731295014913 (Tiny Tapeout Binary to Decimal) tt_um_wokwi_446363984157070337 (HAD TT) tt_um_wokwi_446364133350576129 (Tiny Tapeout Workshop Supercon 25) tt_um_bmellor_lightsout (Lights-Out) tt_um_wokwi_446363771447095297 (Simple Tapped Delay Line) tt_um_sleepy_module (Sleepy Chip) tt_um_camdenmil_sky25b (OctoPWM) tt_um_wokwi_446363844132307969 (wokwi-adder) tt_um_wokwi_446362347802682369 (DETDFF (Tiny Tapeout)) tt_um_arko (Arko) tt_um_wokwi_446363696538901505 (Fastest Finger First) tt_um_wokwi_446363830909757441 (My Tiny Tapeout) tt_um_wokwi_446363833426340865 (First WOWKI Project) tt_um_wokwi_446364777751946241 (Seven Segment Display Driver) tt_um_wokwi_446359782214875137 (Jon_And_Angie_08281999) tt_um_wokwi_446368563224770561 (TinyTapeout2) tt_um_wokwi_446373432938861569 (j-initial-cycler) tt_um_kianV_rv32ima_uLinux_SoC (KianV uLinux SoC) tt_um_kercrafter_leds_racer (LEDs Racer) tt_um_four_bit_cpu_top_level (4Bit_CPU) tt_um_yorimichi_kittscanner (kitt_scanner) tt_um_devmonk_ay8913 (Classic 8-bit era Programmable Sound Generator AY-3-8913) tt_um_tinytapeout_logo_screensaver (VGA Screensaver with Tiny Tapeout Logo) tt_um_TinyWhisper (Tiny Whisper) tt_um_markr_transientshaper (Audio Transient Shaper) tt_um_urish_sic1 (SIC-1 8-bit SUBLEQ Single Instruction Computer) tt_um_essen (Blake2s) tt_um_baud_rate_cdr (Baud-Rate PAM4 Clock and Data Recovery (CDR)) tt_um_b2nch_DreiMann_top (DreiMann) tt_um_tt05_analog_test (TT25 3B DAC and RingO) tt_um_wokwi_446424200424416257 (JK flip-flop) tt_um_willwhang (60/50Hz AC clock) tt_um_toivoh_delta_sigma (Noise shaping delta-sigma DAC) tt_um_wokwi_444123325639097345 (tinytapeout test gates) tt_um_lime_cic_filter (lime_cic_filter) tt_um_VHDL_PWM_DEMUX (PWM Generator) tt_um_VHDL_FSM (FSM) tt_um_vhdl_ALU_top (6bit ALU) tt_um_proppy_bytebeat (bytebeat) tt_um_femto (UNAL's RISCV ) tt_um_ag2048_tiny_calculator (Tiny Calculator) tt_um_alexlowl_myTTproject (myTTproject) tt_um_relax (Relax_Oscillator) tt_um_tiny_shader_v2_mole99 (Tiny Shader v2) tt_um_mattvenn_r2r_dac_3v3 (Analog 8 bit 3.3v R2R DAC) tt_um_evm (Electronic Voting Machine) tt_um_top_axis_uart (AXIS_UART_TTO) tt_um_nco (Numerically Controlled Oscillator) tt_um_morse (Morse Code Converter) tt_um_tiny_hardware_authentication_engine (Tiny Hardware Authentication Engine) tt_um_mattvenn_analog_ring_osc (Ring Oscillators) tt_um_eestevez3_SAR_ADC (8 Bit SAR ADC) tt_um_wokwi_446992736864284673 (Binary Counter) tt_um_patrick_lin_git_mcht_trx (Manchester Encode/Decode with built-in 5X PLL) tt_um_bleeptrack_nn1 (Negative Nature #1) tt_um_bleeptrack_nn2 (Negative Nature #2) tt_um_bleeptrack_nn3 (Negative Nature #3) tt_um_bleeptrack_nn4 (Negative Nature #4) tt_um_underserved (TTSKY25b-RISCV-Core) tt_um_axc1271_tinypong (Tiny Pong) tt_um_Electom_cla_4bits (4-bit CLA) tt_um_zerotoasic_logo_screensaver (VGA Screensaver with Zero to ASIC Logo) tt_um_wokwi_446364830841352193 (Flip the Flop) tt_um_instrumented_ring_oscillator_two (instrumented_ring_oscillator_two) tt_um_tadc_its (Time Domain ADC) tt_um_seven_segment_animations (7-Segment-Animations) tt_um_urish_spell (SPELL) tt_um_algofoogle_vga_matrix_dac (Analog VGA CSDAC experiments (TTSKY25b)) tt_um_cejmu_wspr (CEJMU WSPR Encoder) tt_um_wokwi_442987636779898881 (tt-wokwi) tt_um_wokwi_442977691824856065 (Numbers) tt_um_wokwi_442988211554861057 (Siebensegment_Chip) tt_um_wokwi_442982978057266177 (Kleine Tapeout Vorlagen-Kopie) tt_um_wokwi_442977531497515009 (Tiny Tapeout meli) tt_um_wokwi_442985098452614145 (Template) tt_um_wokwi_442983461306274817 (Tiny tapeout test) tt_um_wokwi_442983243536903169 (Tiny Tapeout Template Hammer) tt_um_wokwi_442979151350678529 (TestGDS) tt_um_wokwi_442982637762839553 (Arjun's First Template Copy) tt_um_tnt_mosbius (tnt's variant of SKY130 mini-MOSbius) tt_um_project (in-81004-1 silicon) tt_um_wokwi_442977548950021121 (Digital_gate) tt_um_wokwi_442987226036856833 (TinyTapeoutTest) tt_um_wokwi_442987174502478849 (4 bit adder) tt_um_wokwi_442984695522496513 (Test) tt_um_wokwi_442977682425413633 (JKU Matt Venn workshop simple project) tt_um_wokwi_442987801460891649 (Tiny Tapeout Template Copy) tt_um_rh_bf_top (TinyBF) tt_um_wokwi_442977585335625729 (WokWi Test) tt_um_wokwi_442977456053457921 (Wokwi Template) tt_um_wokwi_442979336364610561 (ShilpaTinytapeout) tt_um_kianv_rv32_regfile (KianV uLinux RISC-V regfile edition) tt_um_PWM (PWM_selector) tt_um_wokwi_445338187869298689 (WokwiPWM) tt_um_wokwi_447051835034957825 (TicTacToe) tt_um_chrimenz_tinyturing (Tiny Turing Machine) tt_um_emilian_opamp_3v3 (3V3 Opamp and DRAM cell) tt_um_jakedrew_qei (QEI (Quadrature Encoder Interface)) tt_um_wokwi_442977503814034433 (Tiny Tapeout Test Gates) tt_um_wokwi_442978871257096193 (fdfs) tt_um_wokwi_445163636148924417 (not a dumpster fire ) tt_um_wokwi_445175272109059073 (Tiny Takeout Test Gates) tt_um_wokwi_445163800203964417 (Four-bit adder tiny tapeout) tt_um_wokwi_445163606906219521 (Secret Password) tt_um_wokwi_445172222101072897 (Tiny Tapeout Template Project) tt_um_wokwi_445163763917969409 (Tiny Tapeout Binary to 7SD) tt_um_wokwi_445172941748296705 (Anushka and Tina Wokwi) tt_um_wokwi_445163964149915649 (Tahmid and Sunny's First Wokwi Design) tt_um_verilog_meetup_template_project_example (Verilog Meetup Template Project Example) tt_um_brainfck_asic (Brainf*ck ASIC) tt_um_wokwi_446363834407809025 (RHYTHM LOOPER and RANDOMIZER 9000) tt_um_technology_characterization (SKY130 technology characterization) tt_um_mosbius (mini mosbius) tt_um_bouncing_squares (Bouncing squares) tt_um_PseudoSM_ASIC (PSM_asic) tt_um_enjimneering_tts_top (TinyTapeStation) tt_um_morse_it (MORSEASCII) tt_um_vga_projekt_ed_nkpng (vga_projekt_ed_nkpng) tt_um_uart_temp_sens (Uart and Temperature sensor) tt_um_ragnar_lucasnilsson954 (RagnarMegaRaknare) tt_um_react_test_saksh156 (React Chip) tt_um_mastermind (Mastermind) tt_um_synth_magmusson (hardcoded sequencer) tt_um_hammal_fir_filter (FIR Filter) tt_um_tinytone (tt-tinytone) tt_um_julke_gussinatorn2 (JulkeGussinatorn 2.0) tt_um_se_opamps (ttsky25_se_opamps) tt_um_unclegravity_7seg_counter (7-Segment Counter) tt_um_wokwi_445256658591419393 (Andrew chip design) tt_um_counter_isaharp (Counter) tt_um_wokwi_445254959452357633 (Anton's-Hardware-Hack) tt_um_wokwi_445256643197274113 (SignalSorter) tt_um_wokwi_445265826672030721 (The Adder) tt_um_wokwi_445175605912766465 (Tiny Tapeout Hradware Workshop Vaibhav) tt_um_fkd_xorshift (xorshift) tt_um_wokwi_445255035084055553 (Tiny Tapeouts Chip Design) tt_um_wokwi_445254913718704129 (Tiny Tapeout Test Gates) tt_um_wokwi_445254916601240577 (cirucuit) tt_um_wokwi_442988784492711937 (test) tt_um_rejunity_ym2413_ika_opll (YM2413 FM synthesis audio chip) tt_um_top_general (Dual-Channel PWM with SPI Control + Extra Test Logic) tt_um_proppy_megabytebeat (megabytebeat) tt_um_rom_vga_screensaver (VGA Screensaver with embedded bitmap ROM) tt_um_sky25a_nurirfansyah_nauta (Nauta OTA with digital trimming) tt_um_mattvenn_relax_osc (Relaxation oscillator) tt_um_pantelis300_nco (NCO) tt_um_ieeeuoftasic_simproc (SimProc (Simple Processor)) tt_um_rejunity_vga_playground (My (S)VGA Playground) tt_um_Onchip_VCOx2 (Onchip - Ring VCO 11 stages x2) tt_um_dlmiles_dffram32x8_2r1w (Tiny RAM DFF 2r1w) tt_um_Onchip_BandGap (OnChip - Bandgap Reference) tt_um_kianv_bare_metal (KianV RISC-V RV32E Baremetal SoC) tt_um_pommarkus_i2c_slave (I2C Slave) tt_um_MichaelBell_tinyQV (TinyQV Risc-V SoC) tt_um_reservoir (EZ Reservoir) tt_um_morse_w_serial (Morse Code Detector (With Serial RX)) tt_um_dyno (dyno-tt) tt_um_libokuohai_asap_cpu_v1 (ASAP CPU v1) tt_um_2048_vga_game (2048 sliding tile puzzle game (VGA)) tt_um_quick_cpu (4 hour CPU) tt_um_tv_b_gone_rom (TV-B-Gone-EU (ROM Macro variant)) tt_um_flappy_vga_cutout1 (Flappy VGA) tt_um_Sai222777 (XOR Stream Cipher) tt_um_ring_osc3 (Verilog Multistage Oscillator with Enable and Counter) Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available Available