* '''Hammerhead'''. A custom IC called Hammerhead controls the memory subsystem. The components of the Hammerhead IC are the system bus controller, the DRAM controller, the ROM controller, the second-level (L2) cache controller. | * '''Hammerhead'''. A custom IC called Hammerhead controls the memory subsystem. The components of the Hammerhead IC are the system bus controller, the DRAM controller, the ROM controller, the second-level (L2) cache controller. |