Use sram instead of sdram in sim, fully switch to verilator

init_env.sh

@@ -15,7 +15,7 @@ python3.11 -m venv .user_venv
 pip install -r requirements.txt
 
 module load efinity/2023.1
-module load iverilog/12.0
+module load verilator
 module load gtkwave/3.3_gtk3
 
 # pip install -r requirements.txt