Alexander Co Abad

Department of Electronics, Computer and Electrical Engineering, Gokongwei College of Engineering, De La Salle University, Manila

AgilA32

AgilA32 simulator
The chip's Verilog compiled to WebAssembly. Run the boot ROM, the PIO tests and your own programs in the browser, with pins, waveforms and CPU/PIO state. Nothing to install.
AgilA32_PIO
RV32I CPU with an RP2040-compatible PIO block (two state machines), for Tiny Tapeout on IHP SG13G2.
AgilA32_FPGA_core
FPGA self-test of the RV32I core for the Tiny Tapeout FPGA breakout.

MC14500B simulator
Cycle-accurate model of the 1-bit MC14500B SoC, running in the browser with examples: Kill the Bit, traffic light, elevator, logic gates, a 7-segment text display and more. Edit the assembly and run your own programs. Nothing to install.
MC14500B_IHP
1-bit MC14500B-style SoC with 64-byte program RAM, edge detector, clock divider and output latch, for Tiny Tapeout on IHP SG13G2.

ReRAM overview
The lesson plan for the ReRAM series, with all three steps and the reference.
Step 1: ReRAM vs an ordinary resistor
Start here. Write a ReRAM cell with SET and RESET pulses, sweep its I-V loop, and see variation, drift and wear. Nothing to install.
Step 2: How a weight gets written into a cell
Follow one weight from a number to a conductance: pick the cell, round to a level, erase, then pulse and read back until it is close enough. See the pulses, the verify loop and what it costs in time and energy.
Step 3: ReRAM crossbar simulator
A generic, textbook model of a resistive-RAM crossbar doing a matrix-vector multiply with Ohm's and Kirchhoff's laws. Set the weights and inputs, watch the currents add up on the bit lines, and compare against a digital multiply-accumulate for latency and energy. Nothing to install.
ReRAM reference
Equations with worked examples, a searchable glossary, symbols and units, what every simulator setting does, and further reading.

PCM overview
The lesson plan for the PCM series, with all three steps and the reference.
Step 1: PCM vs ReRAM
Put a phase-change cell next to a ReRAM cell. Send both the same pulses, compare the threshold-switching I-V snap with the ReRAM loop, and see drift, variation and wear. Best after ReRAM Step 1. Nothing to install.
Step 2: How a weight gets written into a PCM cell
Follow one weight from a number to a conductance: RESET, then SET pulses with read-back, and what happens when a pulse overshoots. Then watch it drift. Best after PCM Step 1. Nothing to install.
Step 3: PCM crossbar simulator
A grid of phase-change cells multiplying a vector by a matrix, with the SET-staircase write from Step 2 and conductance drift after the write. Compare it with the ReRAM crossbar. Best after Step 2.
PCM reference
The PCM equations with worked examples, a searchable glossary, symbols and units, and what every setting does. Keep it open next to the simulator.