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The Uni-N memory controller and bus bridge IC provides cost and performance benefits by combining several functions into a single IC. It contains the memory controller, the PCI bus bridge, the Ethernet and FireWire interfaces, and the AGP port.
In addition to the four buses listed in Table 2-1, the Uni-N IC also has separate interfaces to the physical layer (PHY) ICs for Ethernet and FireWire and an I 2 C interface that is used for configuring the memory subsystem.
Table 2-1 Buses supported by the Uni-N IC
| 60x bus | Microprocessor | 64 bits | 100 MHz |
| Memory bus | System RAM | 64 bits | 100 MHz |
| PCI bus |
KeyLargo IC and Boot ROM |
32 bits | 33 MHz |
| AGP port | Graphics IC | 32 bits | 66 MHz |
The microprocessor and the I/O controller IC are described in their own sections. The following sections describe the other subsystems that are connected to the Uni-N IC.