UPD65948S1-068 Datasheet

IC型號(hào)：
UPD65948S1-068
PDF描述：
SYSTEM CONTROLLER
文件大小：
996.96KB
PDF頁(yè)數(shù)：
160頁(yè)
芯片廠家：
ETC

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4375 System Controller

Data Sheet

August 2000

Description

The V

4375

system controller is a software-configurable chip that interfaces directly

with an NEC V

43xx

64-bit MIPS

餂?/div>

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 V

43xx

CPU, the V

4375 acts as a memory controller, DMA controller, and PCI bridge. As an

interface with PCI agents, the V

4375 acts as either a PCI bus master or a PCI bus

target. Alternatively, the V

4375 may be located on a PCI bus add-on board.

Features

CPU Interface

鈥?/div>

Direct connection to the 66 MHz V

43xx CPU bus

3.3-volt I/O

Support for all V

43xx bus cycles

Little-endian or big-endian byte ordering modes

Support for boot ROM/flash memory, base memory, and up to two SIMMs

SIMM capacity of up to 128 MB

Programmable address ranges for base and SIMM memory

Support for two-bank 4/16 Mb devices and four-bank 64/128/256 Mb devices

CAS latency of 2 or 3 in base memory or SIMM SDRAM, programmable to

support faster new devices or slower legacy devices

SIMM burst access time programmable in one or two cycle(s)

66 MHz memory bus

64 MB base memory range: SDRAM and EDO DRAM

256 MB SIMM memory range: SDRAM, EDO and fast-page DRAM

Several speed grades supported within each memory range

Open DRAM page maintained within base memory

Eight-word (32-byte) write FIFO (CPU to memory)

Two-word (8-byte) prefetch FIFO (memory to CPU or memory to PCI)

On-chip DRAM and SDRAM refresh generation

Up to 64 MB of write-protectable boot ROM or up to 64 MB of flash ROM

Flash/boot ROM devices with 8-/16-/32-bit configuration support

Programmable timing to interface general-purpose I/O device or boot ROM in

the boot ROM address range

Memory Interface

鈥?/div>

U13749EU2V0DS00

NEC VRC chipsets are designed and Verified for use with NEC VR Series鈩?microprocessors. NEC makes

no claim as to the suitability of VRC chipsets for use with non-NEC microprocessors and does not warrant

their performance, suitability or use in such applications.

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