> I would like to know which kind of memory is
recommended for future
> designs: Static or dynamic? The size of memory is not a
problem: 8MB in
> this case are big enough. The main point is the access
time.
> My experience is that DDR-RAM (as an example of dynamic
RAM) is faster for
> burst accesses just when the CPU is loading cache lines
but what about
> random accesses for data? I think SRAM is faster for
non-contiguous data
> blocks as well as for non burst data accesses and also
for cache inhibited
> accesses.
Hello Holger,
the main reason why DRAM is widely used is because it's
cheap. SRAM needs
about 4 times more chip area and is therefore much more
expensive. Another
advantage of SRAM is that is easier to interface (hardware)
and to configure
(software). Initialization of DRAM controller registers can
cause lots of
headache. So if you only need a few MBs then SRAM is
probably cheaper in the
end.
BTW do you know an affordable 4 or 8MB SRAM chip with 32bit
bus width and
<15ns access time (3.3V synchronous bus interface
prefered)?
Cheers
Bene
--
Benezan Electronics, Stauffenbergstr. 26, D-72108 Rottenburg
Baisingen
CNC- und Steuerungstechnik, Elektronikentwicklung
----- Original Message -----
From: <holger.krause sieb-meyer.de>
To: <nicolasbenezan.de>
Sent: Tuesday, July 11, 2006 1:44 PM
Subject: [ColdFire] Static RAM vs. Dynamic RAM
Hello,
Would anyone agree or am I wrong?
Best regards
Holger Krause.
------------------------------------------------------------
----
SIEB & MEYER AG
Software-Entwicklung CNC / Holger Krause
Auf dem Schmaarkamp 21
D-21339 Lüneburg
Germany
Tel.: +49-(0)4131 203-1505
Fax.: +49-(0)4131 38562
E-Mail: Holger.Krausesieb-meyer.de
http://www.sieb-meyer.de
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