ARMAS Rambus

Rambus
General Description

1. Rambus is a chip to chip interface design that is system wide, allowing 800 Mhz transfer rates. It allows data transfer through a simplified bus that operates in a high frequency range. Rambus uses a low voltage signal swings with data transfer on both edges of a synchronizing pulse.
2. RDRAM (Rambus DRAM)
IN 1998, Direct RDRAM boosted speed is up to 1.6GB/sec. Rambus Licenses its memory designs to semiconductor companies, which manufacture the chips. Intel has invested in and has been involved in the design of the Direct Rambus.

BAND WIDTH OF MEMORY MODULE
Memory Module	Band Width
PC-66 DIMM (SDRAM)	528M Byte/sec
PC-100 DIMM (SDRAM)	800M Byte/sec
PC-133 DIMM (SDRAM)	1.06G Byte/sec
PC-266 DIMM (DDR)	2.12G Byte/sec
Rambus RIMM (Direct RDRAM)	1.6G Byte/sec

Rambus Specifications:

1. RIMM density: 128MB, 256MB
2. Voltage: Single 2.5 Volt Operation
3. RDRAM Data Rate: 600MHz - 800 MHz.
4. Serial Presence Detect with Serial EEPROM
5. Meets Rambus RIMM Design Specifications

THE DIFFERENCE BETWEEN RIMM & PC100 DIMM
	RIMM Module	PC100 DIMM Module
BUS Frequency	400MHz	100MHz
DRAM IC	Direct Rambus DRAM	PC100 SDRAM
DRAM Package	BGA	TSOP
Operated Voltage	2.5V	3.3V
Module Pin	184-pin	168-pin
Operated Frequency	800MHz	100MHz
Bandwidth	1.6GB/sec	800MB/sec
Speed of I/O	16-bit/serial	64-bit/parallel
Layers of PCB	8	6

RIMM Available Capacities:
1. 800MHz 128MB
2. 128MB w/ ECC
3. 256MB
4. 256 MB w/ECC