[Oberon] Oberon on ULX3S explanation

D EMARD vordah at gmail.com
Wed Nov 13 23:51:35 CET 2019

Well the SDRAM chips all behave the same so any datasheet
of micron or alliance would do to see how they "work". At the
end some deeper understanding is not necessary, there are
plenty of driver cores in source you can take any one that closest
fits to your hardware and it will as "black box" expose standard
interface of data and adress bus with write and read enable signals.

On 11/13/19, Skulski, Wojciech <skulski at pas.rochester.edu> wrote:
> Paul wrote:
>> Unfortunately, although commonly-used because it's cheap per bit,
>> synchronous DRAM is much more complicated than the fast asynchronous
>> static RAM used in the Oberon FPGA reference design.  Getting a
>> description of how this was implemented on the ULX3S board would have
>> been useful in understanding the design trade-offs, but unfortunately
>> all we got was another advert.
> There are some very good and well documented designs on OpenCores. Whether
> or not to use them and which one is another matter, but the documentation is
> worth pursuing.  I do not endorse any of these designs because I have not
> used them. My recommendation concern the documents. Download, unpack, and
> read the documents before pursuing any given firmware. Or before designing
> any board, for that matter. In the past I was guilty of designing boards
> based on hardware specifications without first looking into firmware issues.
> Not anymore!
> http://opencores.org/project,sdr_ctrl  -- 8/16/32 bit SDRAM Controller;
> 28-page manual
> http://opencores.org/project,hpdmc -- DDR DRAM targeting video
> http://opencores.org/project,wbddr3 -- a horror story about DDR3
> Wojtek
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon

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