Micronics C400 System Board Manual
Chapter 3: Installing the Micronic
s C400
19
System Memory
System memory is necessary to operate the Micronics C400
system board. The Micronics C400 has three 3.3V unbuf-
fered 64/72-bit, 168-pin DIMM sockets for a maximum of
768MB of SDRAM memory. Support is provided for stan-
dard SDRAM (66MHz) and PC-100MHz SDRAM. This
section list the rules for adding memory to the Micronics
C400, give some examples of common memory configura-
tions 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 8ns or faster PC-100 SDRAM DIMMs when using
a 100MHz bus speed processor.
❏ Use 10ns or faster SDRAM DIMMs when using a
66MHz bus speed processor. NOTE: PC-100 memory is
backwards compatible to run at the 66MHz bus speed.
❏ Use only PC-100MHz DIMM modules for the 100MHz
Front Side Bus speeds (350-450). Due to the strict
timing issues involved when operating at 100MHz, your
system will not boot if non-compliant PC-100 DIMM
modules are used.
For long
term
reliability,
Diamond
recom-
mends
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
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