FPGA Finite difference

This repo contains a rtl implementation of the forward difference expression, util to apromimate the numerical differentiation

Requirements

• verilator

Usage

To run the test

$ make 

This give you the information if the implementation pass the test or not. If you want to visualize the wave, you can use gtkwave and display the timing digram using

$ gtkwave fwht_trace.vcd

Input	Current State	Next State	Output
Start	IDLE	S1	00000000
X	S1	S2	11000000	Save Input 1 (Dy)
X	S2	S3	11010000	Save Input 1 (Dy)
X	S3	S4	11011000	Save Input 2 (Dy) and Write FIFO
~o_full	S4	S3	11111100	Full FIFO
o_full	S4	S4	11111100	Full FIFO
X	S5	S5	11111101	Read FIFO
X	S6	S6	11111101	Save Input 2 (Dx)
(&Counter)	S7	S7	11111111	Wait and save results
~(&Counter)	S7	S8	11111111	Wait and save results
X	S8	S8	11111111	Save last Input 2 (Dy)
X	S9	S10	11110111	Save last Result (Dy)
(&fifo_counter)	S10	S10	11110011	Wait And save results
~(&fifo_counter)	S10	S11	11110011	Wait And save results
X	S11	S111	10000011	Save last Input 2 (Dx)
X	S12	IDLE	10000000	Save last Result (Dx)

License

MIT License

Copyright (c) 2021 Andres Manjarres

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.