
Rev. 0.2/Jan. 99
1
Overview
The Direct Rambus RIMM module is a general purpose
high-performance memory 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.
The 64 MB Direct Rambus RIMM module consists of four
64M Direct Rambus DRAM (Direct RDRAM ) devices.
These are extremely high-speed CMOS DRAMs organized
as 4M words by 16 or 18 bits. The use of Rambus Signaling
Level (RSL) technology permits 600MHz 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 (10ns per
sixteen bytes).
The architecture of the Direct RDRAM allows 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 sixteen
banks support up to four simultaneous transactions.
Features
184-pin 1mm pin spacing
Card Size: 133.35mm x 34.93mm x 1.27mm
(5.25” x 1.375” x 0.050”)
64 MB Direct RDRAM storage
Each RDRAM has 16 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 volt supply (
±5%)
Low power and powerdown self refresh modes
Separate Row and Column buses for higher efficiency
Key Timing Parameters/Part Numbers
The following table lists the frequency and latency bins
available from RIMM modules. An optional -LP designator
is used to indicate low power modules.
Form Factor
The Direct Rambus RIMM modules are offered in a 184-pin
1mm pin pitch form factor suitable for desktop and other
system applications.
Organization
I/O Freq.
MHz
trac (Row Access
Time) ns
Part
Number
16M x 16
600
53
HYMR1616-653
16M x 16
800
45
HYMR1616-845
16M x 16
800
40
HYMR1616-840
16M x 18
600
53
HYMR1816-653
16M x 18
800
45
HYMR1816-845
16M x 18
800
40
HYMR1816-840
Direct Rambus RIMM Module
32 MBytes (16M x 16/18) based on 4Mx16/18