SYNTHINGS is a digital synthesizer development platform that I've been building.

Revision B boards

jason | 27 November, 2010 19:27

In addition to moving the display connector to the underside of the board, I also took the opportunity to add 4 extra connections for FPGA inputs. While planning how the addressing scheme would work, I decided I didn't have enough address lines.

Adding the 4 lines gave me 18 I/O lines from the CPU to the FPGA. However, I also needed to redo the bottom board to take advantage of the extra pins.  (More)

Initial assembly of boards

jason | 26 November, 2010 17:10

The FPGA board had been built a few days ago, and all looked good - it was responding to JTAG requests, at least!

I had a box from an earlier project that was about the right form factor what I wanted, so I designed two boards - an upper User Interface board that would hold the display, the keys and the rotary encoder, whilst the bottom board would hold the power generator, CPU (PIC), MIDI input, and audio jack.  (More)

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