Disable macro ROMs in SIM and FPGA

rejunity · Nov 10, 2024 · e84618d · e84618d
1 parent a0b3b7a
commit e84618d
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Showing 2 changed files with 23 additions and 2 deletions.
diff --git a/fpga/icebreaker.v b/fpga/icebreaker.v
@@ -5,6 +5,7 @@
 // Also see: https://projectf.io/posts/fpga-graphics/
 
 `default_nettype none
+`define FPGA
 `define VGA_6BPP
 // `define VGA_12BPP
 // `define DVI

diff --git a/src/tt_um_rejunity_atari2600.v b/src/tt_um_rejunity_atari2600.v
@@ -311,6 +311,27 @@ module tt_um_rejunity_atari2600 (
   reg  [7:0] rom2_data_r;
   reg  [7:0] rom3_data_r;
 
+`ifdef SIM
+  always @(*)
+   casez ({use_internal_rom, rom_config[3:1]})
+     4'b0zzz: rom_data = external_rom_data;
+     4'b10zz: rom_data = internal_rom_data;
+     4'b1100: rom_data = internal_rom_data;
+     4'b1101: rom_data = internal_rom_data;
+     4'b1110: rom_data = internal_rom_data;
+     4'b1111: rom_data = internal_rom_data;
+   endcase
+`elsif FPGA
+  always @(*)
+   casez ({use_internal_rom, rom_config[3:1]})
+     4'b0zzz: rom_data = external_rom_data;
+     4'b10zz: rom_data = internal_rom_data;
+     4'b1100: rom_data = internal_rom_data;
+     4'b1101: rom_data = internal_rom_data;
+     4'b1110: rom_data = internal_rom_data;
+     4'b1111: rom_data = internal_rom_data;
+   endcase
+`else 
   rom_2600_0 rom0_I (
     .addr (romx_addr),
     .q    (rom0_data)
@@ -339,8 +360,6 @@ module tt_um_rejunity_atari2600 (
     rom2_data_r <= rom2_data;
     rom3_data_r <= rom3_data;
   end
-
-
   always @(*)
    casez ({use_internal_rom, rom_config[3:1]})
      4'b0zzz: rom_data = external_rom_data;
@@ -350,6 +369,7 @@ module tt_um_rejunity_atari2600 (
      4'b1110: rom_data = rom2_data_r;
      4'b1111: rom_data = rom3_data_r;
    endcase
+`endif
 
   always @(posedge clk) begin
   `ifdef VALIDATE_QSPI_ROM_AGAINST_INTERNAL_ROM