Cyclone System Board Manual
Chapter 3: Installing the Cyclone
21
System Memory
System memory is necessary to operate the Cyclone system
board. The Cyclone has two 3.3V unbuffered
64-bit, 168-pin DIMM sockets for a maximum of 256MB of
memory. Support is provided for EDO and SDRAM
memory. This section list the rules for adding memory to
the Cyclone, give some examples of common memory
configurations and show how to physically install the
memory.
Adding Memory
The following is a list of rules to follow when installing
DIMMs. If you follow these rules, your upgrade should be
trouble-free:
❏
Use 10ns or faster SDRAM or 70ns or faster EDO
DIMMs.
❏
DIMM memory modules support EDO and SDRAM
(unbuffered) memory types.
❏
Singled-sided and double-sided memory modules are
supported.
❏
Upgrade DIMMs one bank at a time. Start with Bank
0, then Bank 1 (one DIMM per bank).
❏
Different memory types and sizes in separate banks
will cause the performance of the memory to run at
the speed of the slowest RAM installed and/or cause
operating system stability problems.
For long term
reliability,
Micronics
recommends
using
DIMMs with
gold-plated
contacts.
The use of
tin-plated
contacts
may conflict
with the gold
alloy on the
DIMM
socket.
168-Pin DIMM
one
bank
