[sdiy] Re: FPGA 2-OP FM MIDI Polysynth

Scott Gravenhorst music.maker at gte.net
Sun May 3 21:24:16 CEST 2009

Here is 16vFM-2x4, a 16 voice version is now working, same structure, just double
the voice count.  The 16 voice PicoBlaze-based MIDI controller (with LCD code
included) uses 3/4 of the code space allowed (727 instructions).



Not sure if it really shows off the polyphony, but I don't hear any voice stealing.

At 16 voices the design still uses only about 45% of the [500K equiv gate] FPGA. 
It's kind of amazing to watch the numbers, the size of the footprint certainly did
not double, only the size of some of the RAMs did.

Oh and this synth is currently using a _twelve_ bit DAC.

-- ScottG
-- Scott Gravenhorst
-- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/FPGA_synth/
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- When the going gets tough, the tough use the command line.

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