676 SAP-1 Computer

676 : SAP-1 Computer

Design render
  • Author: Jonathan Zhou, Rana Singh, Anika Agarwal
  • Description: Simple as Possible computer with multiplier and divider into ASIC
  • GitHub repository
  • Clock: 10000000 Hz

How it works

  (Forked from Brandon Cruz's SAP-1 Design)

  Originally, Malvino and Brown presented the SAP-1 architecture in a book called Digital Computer Electronics.
  The design gained massive popularity when it was build as a bread board computer by Ben Eater on a series of YouTube videos.
  The architecture contains various modules, including
  - Clock
  - Program Counter
  - Register A
  - Register B
  - Adder
  - Multiplier
  - Divider
  - Memory
  - Instruction Register
  - Bus
  - Controller
  This design doesn't have inputs, it is dependent only on the clock that coordinates sequence of the computer's operation.
  Its operation consists on the communication that that bus provides between modules; the signal load dumps information into a module
  and the enable signal allows the bus to receive a signal. The bus is 8-bit width since it is an 8 bit computer, and the registers
  are also 8-bit registers.
  The computer can only perform addition, whether it is positive numbers or negative numbers (substraction).
  The signals information is stored within the memory module. There bus operations are coordinated with a series of multiplexers and
  the instruction execution set gives the SAP-1 a total of six stages from 0 to 5, repeating all over again.
  The more important module      is the controller. It controlls the assertion execution according to the stimuli from the stages.
  The stages 3 to 5 five depend on the instructions of the operation codes.

How to test

  Design Output Reading Section
  The design is engineered to read the output signal generated from the bus, which contains the information
  of the add and subtract operations executed by the design. Currently, the only method to read the signals
  is through an oscilloscope. However, a significant enhancement would be the implementation of a state machine
  controlling a 3 7-segment display to show the numbers on the 8-bit bus (up to 255).

External hardware

List external hardware used in your project (e.g. PMOD, LED display, etc), if any

Oscilloscope

IO

#InputOutputBidirectional
0bus[0]
1bus[1]
2bus[2]
3bus[3]
4bus[4]
5bus[5]
6bus[6]
7bus[7]

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 Mux Analog Mux Mux Mux Mux Mux Mux Mux Mux Mux Mux tt_um_chip_rom (Chip ROM) tt_um_factory_test (TinyTapeout 06 Factory Test) tt_um_analog_factory_test (TT06 Analog Factory Test) tt_um_analog_factory_test (TT06 Analog Factory Test) tt_um_urish_charge_pump (Dickson Charge Pump) tt_um_psychogenic_wowa (WoWA) tt_um_oscillating_bones (Oscillating Bones) tt_um_kevinwguan (Crossbar Array) tt_um_coloquinte_moosic (Moosic logic-locked design) tt_um_alexsegura_pong (Pong) tt_um_iron_violet_simon (Iron Violet) tt_um_tomkeddie_a (VGA Experiments in Tennis) tt_um_MichaelBell_tinyQV (TinyQV Risc-V SoC) tt_um_andychip1_sn74169 (sn74169) tt_um_mattvenn_r2r_dac (Analog 8bit R2R DAC) tt_um_thorkn_audiochip_v2 (AudioChip_V2) tt_um_faramire_gate_guesser (Gate Guesser) tt_um_urish_simon (Simon Says game) tt_um_TT06_SAR_wulffern (TT06 8-bit SAR ADC) tt_um_soundgen (soundgen) tt_um_ledcontroller_Gatsch 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tt_um_S2P (Serial to Parallel Register) tt_um_PWM (PWM) tt_um_ss_register (serie_serie_register) tt_um_stepper (Stepper) tt_um_g3f (Generador digital trifásico) tt_um_ALU_DECODERS (ALU with a Gray and Octal decoders) tt_um_ram (4 bit RAM) tt_um_sap_1 (SAP-1 Computer) tt_um_guitar_pedal (Integrated Distorion Pedal) tt_um_mbalestrini_usb_cdc_devices (Two ports USB CDC device) tt_um_adammaj (Tiny ALU) tt_um_wokwi_395567106413190145 (4-Bit Full Adder and Subtractor with Hardware Trojan) tt_um_gak25_8bit_cpu_ext (Most minimal extension of friend's 'CPU In a Week' in a day) tt_um_hsc_tdc (UCSC HW Systems Collective, TDC) tt_um_BoothMulti_hhrb98 (UACJ-MIE-Booth 4) tt_um_dlmiles_poc_fskmodem_hdlctrx (FSK Modem +HDLC +UART (PoC)) tt_um_simplez_rcoeurjoly (tt6-simplez) tt_um_nurirfansyah_alits01 (Analog Test Circuit ITS: VCO) tt_um_ppca (drEEm tEEm PPCA) tt_um_wokwi_395522292785089537 (Displays CIt) tt_um_fpu (Dgrid_FPU) tt_um_duk_lif (Leaky Integrate and fire neuron(LIF)) tt_um_bomba1 (Latin_bomba) tt_um_chatgpt_rsnn_paolaunisa (ChatGPT designed Recurrent Spiking Neural Network) tt_um_bit_ctrl (Bit Control) tt_um_array_multiplier_hhrb98 (Array Multiplier) tt_um_wallace_hhrb98 (UACJ-Wallace multiplier) tt_um_I2C_to_SPI (TinyTapeout SPI Master) tt_um_rng (Random number generator) tt_um_wokwi_395599496098067457 (EVEN AND ODD COUNTERS) tt_um_8bitALU (8bit ALU) tt_um_aleena (Analog Sigmoid) tt_um_rejunity_1_58bit (Ternary 1.58-bit x 8-bit matrix multiplier) tt_um_rejunity_fp4_mul_i8 (FP4 x 8-bit matrix multiplier) tt_um_PWM_Controller (PWM Controller) tt_um_couchand_cora16 (CORA-16) tt_um_frq_divider (clk frequency divider controled by rom) tt_um_wokwi_390913889347409921 (Notre Dame Dorms LED) tt_um_timer_counter_UGM (4-Digit Scanning Digital Timer Counter) tt_um_koconnor_kstep (kstep) tt_um_lancemitrex (DIP Switch to HEX 7-segment Display) tt_um_PWM_Sine_UART (PWM_Sinewave_UART) tt_um_nicklausthompson_twi_monitor (TWI Monitor) tt_um_wokwi_395615790979120129 (Cambio de 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