DECA Top level for SNES by Somhic (07/11/21) adapted from Neptuno port https://github.com/neptuno-fpga/SNES by DistWave.

(THIS PORT REQUIRES AN SDRAM MODULE WITH SEPARATED DQMH/L SIGNALS - 3 pins old MiSTer memory modules should work)

22/04/22 now compatible with Deca Retro Cape 2 (new location for 3 pins of old SDRAM modules)

Features:

• HDMI video output (need to solve synchronism problems)
• VGA 444 video output is available through GPIO (see pinout below).
• Line out (3.5 jack green connector) and HDMI audio output
• PWM audio is available through GPIO (see pinout below)
• Joystick available through GPIO (see pinout below). Joystick power pin must be 2.5 V
  • DANGER: Connecting power pin above 2.6 V may damage the FPGA
  • This core is prepared for Megadrive 6 button gamepads as it outputs a permanent high level on pin 7 of DB9

Additional hardware required:

• SDRAM module. Tested with a dual memory module v1.3 with 3 pins (see connections + 3pins)
• PS/2 Keyboard connected to GPIO (see pinout below)

Versions:

• current version: 0.24
• see changelog in top level file DECA/snes_deca.sv

Compiling:

• Load project in DECA/snes_deca.qpf
• sof/svf files already included in DECA/output_files/

Pinout connections:

Audio L/R pins have changed due to using 3 pins memory modules (check location at snes_deca.qsf file).

Mouse pinout is not used in this core.

Others:

• Button KEY0 is a reset button

• Working fine

• HDMI video outputs special resolution, so does not work in all monitors.

Follows original README from NeptUNO.

Port from MiST to NeptUNO by DistWave

..* Esc / F12: Oculta / muestra el menú ..* Cursores: Control en el menú ..* Intro: selecciona la opción ..* Bloq Desp: Cambio VGA 31.5 kHz / RGB 15 kHz

..* Mando: Cursores ..* Start: 8 ..* Select: 9 ..* A: . ..* B: , ..* X: l ..* Y: k ..* L: i ..* R: o

..* Mando: W, A, S/X, D ..* Start: 1 ..* Select: 2 ..* A: n ..* B: b ..* X: h ..* Y: g ..* L: t ..* R: y