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MC-4R64CPE6C-653

Direct Rambus™ DRAM RIMM™ Module 64M-BYTE (32M-WORD x 16-BIT)

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PRELIMINARY DATA SHEET

MOS INTEGRATED CIRCUIT

MC-4R64CPE6C

Direct RambusTM DRAM RIMMTM Module

64M-BYTE (32M-WORD x 16-BIT)

Description

The Direct Rambus RIMM module is a general-purpose high-performance memory module subsystem suitable for

use in a broad range of applications including computer memory, personal computers, workstations, and other

applications where high bandwidth and low latency are required.

MC-4R64CPE6C modules consists of four 128M Direct Rambus DRAM (Direct RDRAM™) devices (µPD488448).

These are extremely high-speed CMOS DRAMs organized as 8M words by 16 bits. The use of Rambus Signaling

Level (RSL) technology permits 600MHz, 711MHz or 800MHz transfer rates while using conventional system and

board design technologies.

Direct RDRAM devices are capable of sustained data transfers at 1.25 ns per two bytes (10 ns per sixteen bytes).

The architecture of the Direct RDRAM enables the highest sustained bandwidth for multiple, simultaneous,

randomly addressed memory transactions. The separate control and data buses with independent row and column

control yield over 95 % bus efficiency. The Direct RDRAM's 32 banks support up to four simultaneous transactions

per device.

Features

• 184 edge connector pads with 1mm pad spacing

• 64 MB Direct RDRAM storage

• Each RDRAM® has 32 banks, for 128 banks total on module

• Gold plated contacts

• RDRAMs use Chip Scale Package (CSP)

• Serial Presence Detect support

• Operates from a 2.5 V supply

• Low power and powerdown self refresh modes

• Separate Row and Column buses for higher efficiency

• Over Drive Factor (ODF) support

The information in this document is subject to change without notice. Before using this document, please

confirm that this is the latest version.

Not all devices/types available in every country. Please check with local NEC representative for

availability and additional information.

Document No. M14805EJ2V0DS00 (2nd edition)

The mark 5 shows major revised points.

Date Published August 2000 NS CP (K)

Printed in Japan

©

2000

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