• gpu_card.sv represents the GPU card, including gpu_die.sv, and simulated off-chip global memory
• gpu_die.sv represents the GPU die
• core.sv represensts a single GPU core
• gpu_controller.sv handles communications with the main cpu, and main memory

The sub-folder gpu_runtime contains C++ source-code for a C++ runtime library, that handles:

• compilation of C++ single source programs into device side and hostside code
• communications with gpu_controller.sv, in order to send data to and from the GPU global memory, and to launch kernels
• GPU memory allocation (handled host-side)