remove init blocks from core componsnts

chip8.sv

@@ -1,5 +1,6 @@
 module chip8 (
-    input wire clk_in
+    input wire clk_in,
+    input wire rst_in
 );
 
   bit [31:0] vram[0:2047];
@@ -16,6 +17,7 @@ module chip8 (
 
   beeper beeper (sound_timer);
   cpu cpu (
+      rst_in,
       memory,
       clk_in,
       keyboard,
@@ -39,7 +41,8 @@ module chip8 (
   );
   rom_loader loader (memory);
 
-  initial begin
+  always_ff @(posedge clk_in) begin
+    if (rst_in) begin
         bit [7:0] fontset[79:0] = {
           8'hF0,
           8'h90,
@@ -133,4 +136,5 @@ module chip8 (
           keyboard[i] = 0;
         end
     end
+  end
 endmodule

cpu.sv

@@ -1,4 +1,5 @@
 module cpu (
+    input wire rst_in,
     output bit [7:0] memory[0:4095],
     input wire clk_in,
     input wire keyboard[15:0],
@@ -31,8 +32,8 @@ module cpu (
   logic [31:0] screen_pixel;
   logic [7:0] sprite_pixel;
 
-  // Initialize CPU
-  initial begin
+  always_ff @(posedge clk_in) begin
+    if (rst_in) begin
         halt = 0;
         watch_key = 255;
         sound_timer = 0;
@@ -41,8 +42,6 @@ module cpu (
         program_counter = 'h200;
         stack_pointer = 4'b0000;
     end
-
-  always_ff @(posedge clk_in) begin
     opcode = {memory[program_counter+0], memory[program_counter+1]};
     $display("HW     : opcode is 0x%h (%b)", opcode, opcode);
     $display("HW     : PC %0d 0x%h", program_counter, program_counter);

yayacemu.cpp

@@ -141,9 +141,11 @@ int main(int argc, char **argv) {
 
   Vchip8 *dut = new Vchip8{contextp};
 
+  dut->rst_in = 1;
   while (true) {
     dut->clk_in ^= 1;
     dut->eval();
+    dut->rst_in = 0;
     usleep(1000000 / EMULATION_HZ);
     if (SDL_QuitRequested()) {
       std::cout << "INF_EMU: Received Quit from SDL. Goodbye!" << '\n';