SC System

The nu+ single core system is defined in the npu_system.sv module, under src/sc/system folder. The following figure depicts the organization of the NaplesPU Single Core version:

The single core version instantiates the following modules:

1. NaplesPU core: module npu_core (described in NaplesPU core architecture)
2. item interface: npu_item_interface module, allows host-device communication and performance info fetching.
3. transaction logger: npu_core_logger module, which logs both incoming responses from the main memory and issued requests from the core to the memory. This module stores up to CORE_LOG_SIZE (default 512) for the core issued transactions, and MEM_LOG_SIZE (default 512)
4. core interface: core_interface module, connects the NaplesPU core and the cache-controller for the single core version, module sc_cache_controller
5. cache controller: sc_cache_controller module, the cache controller for the single core version of the NaplesPU architecture, described in Cache Controller
6. system bus: mux_multimaster module, shared multi-master bus. It allows both the core and the host-interface to concurrently access the main memory and custom devices
7. test device: io_device_test module, an example of a memory mapped custom device in the NaplesPU system
8. synchronization core: synchronization_core module, acts as the synchronization master allowing thread synchronization through barriers. The module is the same as the many core version, although it requires minor adjustments:

assign network_available     = 1'b1;
assign ni_account_mess_valid = c2n_account_valid;

Since the single core version of the system has no network, the network availability input port has to be constantly high.