Initial work on reading instructions from bootROM

sim/shared/clkgen.sv

@@ -0,0 +1,18 @@
+module clkgen #(
+    PERIOD_NS      = 10,
+    RESET_DELAY_NS = 100
+) (
+    output logic clk_o,
+    output logic nreset_o
+);
+
+    initial begin
+        clk_o    <= 1'b0;
+        nreset_o <= 1'b0;
+        #RESET_DELAY_NS nreset_o <= 1'b1;
+    end
+
+    always
+        #(PERIOD_NS/2) clk_o <= ~clk_o;
+
+endmodule