So, I managed to put together an incredibly primitive synthesizer ^^)) Now it works as a doorbell - it plays 4 notes in a cycle.

The composition of the FPGA logic:

1) Generative logic-oscillator from a counter-accumulator with the output of the high-order bit as sound
2) Virtual user processor NIOS2, which feeds the required number-delta to the control input of the oscillator to create a cyclic count with the desired tone frequency, as well as changes this number to create a repeating melody 3) External SDRAM 128 Mbit for storing the control program and the processor's operation

The oscillator is able to reproduce any wave from the table, but creating a table is a separate task, until it was postponed for the future, as a result, only a one-bit wave plays in the test.

As a summary, I want to immediately warn those who want to repeat this - creating your own processor and independently connecting and programming SDRAM is not an easy task, just knowing the little bit and noob-coding is not enough, you have…

Original tracker view of the music. Made in SQ-Tracker 1.03 by Aki.
Cover of a PC music software demo song.

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