1.1.0

PCB

• Layout cleanup and removal of parts that are redundant now
• Fixed plane breakage near center of board
• Added 47pF caps to RMPX/PMPX to reduce chance of glitches

RTL

• Updated .pcf with reassigned pins from the above PCB changes
• Disabled MIDI input by default as it's an optional extra. Can be enabled by setting ENABLE_MIDI = 1 in top.v.

Flash instructions

To flash the attached bitstream and firmware using dfu-util:

dfu-util -a 0 -D bitstream.bin
dfu-util -R -a 1 -D firmware.bin

1.0.1

• Minor improvements to headphone output.
• Added RC filter for YM3016 power supply to reduce noise.
• Added series resistors for YM2610-to-YM3016 outputs to reduce noise.
• Changed S/PDIF coax output footprint to suit 74LVC1G34.

There was no audible noise from both analog outputs when testing.

1.0.0

Initial version of the PCB.

Features confirmed working

• YM2610 control (see demo videos)
• Optical output (see demo videos)
• MIDI input
• Analog audio output including line out, SSG/FM/PCM attenuation circuits. No audible noise through line out.

Features with known issues

• Headphone output works as intended but there is a slight amount of added noise
• Coax output driver in schematic (74LV1T34) should have been replaced with a 74LVC1G34. Any substitute part with matching footprint and equal or greater output current can be used.