133 3 Neuron ALIF
133 : 3 Neuron ALIF
- Author: Andrew Smith
- Description: TODO
- GitHub repository
- Clock: 0 Hz
How it works
3 Adaptive Leaky Integrate and Fire Neurons
-
Receives an 8-bit input signal (ui_in) with small offset variations
-
Processes the signal through the LIF model which simulates biological neuron behavior by:
- Integrating (accumulating) input current over time
- Applying a leak factor to gradually decrease membrane potential
- Generating a spike when membrane potential exceeds threshold
- Adjusting a moving threshold based on periods of past inputs
- Outputs:
- Spike signals on uio_out[7:5]:
- uio_out[7]: Neuron 1 spike output
- uio_out[6]: Neuron 2 spike output
- uio_out[5]: Neuron 3 spike output
- Internal state of Neuron 1 on uo_out[7:0] for debugging/testing
How to test
- Basic Functionality Test:
- Apply a constant input value through ui_in
- Monitor uio_out[7:5] to observe spike patterns
- Check uo_out to monitor Neuron 1's internal state
- Threshold Response Test:
- Gradually increase ui_in value
- Observe spike behavior on uio_out[7:5]
- Verify neurons spike when input exceeds threshold
- Reset Test:
- Assert rst_n (active low)
- Verify all spike outputs (uio_out[7:5]) go low
- Verify internal state (uo_out) resets to initial value
External hardware
No external hardware required. The design uses only the built-in TinyTapeout inputs and outputs:
- 8 input pins (ui_in[7:0])
- 8 output pins (uo_out[7:0])
- 8 bidirectional pins (uio_out[7:0])
- Clock (clk)
- Reset (rst_n)
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | Input current bit [0] | State variable bit [0] | |
| 1 | Input current bit [1] | State variable bit [1] | |
| 2 | Input current bit [2] | State variable bit [2] | |
| 3 | Input current bit [3] | State variable bit [3] | |
| 4 | Input current bit [4] | State variable bit [4] | |
| 5 | Input current bit [5] | State variable bit [5] | |
| 6 | Input current bit [6] | State variable bit [6] | |
| 7 | Input current bit [7] | State variable bit [7] | Spike bit |