The VRC4375TM system controller is a software-configurable chip that interfaces directly

with an NEC VR43xxTM 64-bit MIPS RISC CPU and PCI bus without external logic or

buffering. The system controller also interfaces with memory (SDRAM, EDO, fast-page

DRAM, and flash/boot ROM) with minimal to no buffering. The memory bus can also

interface with SRAM and general-purpose I/O devices. As an interface with the VR43xx

CPU, the VRC4375 acts as a memory controller, DMA controller, and PCI bridge. As an

interface with PCI agents, the VRC4375 acts as either a PCI bus master or a PCI bus

target. Alternatively, the VRC4375 may be located on a PCI bus add-on board.

! CPU Interface

• Direct connection to the 66-MHz VR43xx CPU bus

• 3.3-V I/O

• Support for all VR43xx bus cycles

• Little-endian or big-endian byte ordering modes