329 Multi-Mode Sensor Signal Processor
329 : Multi-Mode Sensor Signal Processor
- Author: AG1- Ghani Lab - Emirates Chip Competence
- Description: A multi-mode digital signal processing unit supporting filtering, accumulation, edge detection, and nonlinear transformation.
- GitHub repository
- Open in 3D viewer
- Clock: 50000000 Hz
How it works
This design is a small multi-mode digital signal processing unit. It takes two 8-bit inputs (ui_in and uio_in) and processes them based on a 2-bit mode selected from their least significant bits.
The system also stores a previous output value (prev), which allows it to perform operations that depend on past data.
There are four modes:
Mode 00 – FIR Filter: Performs a simple weighted sum of the current inputs and the previous output to smooth the signal.
Mode 01 – MAC (Multiply-Accumulate): Multiplies the upper bits of the inputs and adds the result to the previous output.
Mode 10 – Edge Detection: Detects changes in the input signal by comparing it with the previous value.
Mode 11 – Nonlinear Compression: Reduces the signal magnitude by shifting it based on its highest active bit.
The output updates on each clock cycle depending on the selected mode.
How to test
Go to the test directory: cd test Run the simulation: make -B After the simulation finishes, a waveform file named tb.vcd will be generated. Open the waveform using GTKWave: gtkwave tb.vcd
The testbench applies a reset, enables the design, and then cycles through all four modes while providing different input values. It also prints output values during simulation.
In the waveform viewer, check:
ui_in and uio_in for inputs uo_out for output clk and rst_n for timing prev (internal signal) to see how past values affect behavior to be updated
External hardware
No external hardware is required for simulation.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | A0 | P0 | B0 |
| 1 | A1 | P1 | B1 |
| 2 | A2 | P2 | B2 |
| 3 | A3 | P3 | B3 |
| 4 | A4 | P4 | B4 |
| 5 | A5 | P5 | B5 |
| 6 | A6 | P6 | B6 |
| 7 | A7 | P7 | B7 |