Hello, * On Tue, Sep 17, 2019 at 11:46:14AM +0200 Gerrit Heitsch wrote: > On 9/17/19 11:27 AM, smf wrote: > > On 17/09/2019 09:32, Gerrit Heitsch wrote: > > > > > > It should be since at power on the capacitor in a DRAM cell is empty > > > and if you stop refreshing it, it will also become empty after a > > > while. Whether this 'empty' is read as '1' or '0' depends on the > > > location on the die and on the manufacturer. > > > > Can you explain why empty is read as 1 or 0 though? As far as I know > > dram cells are either empty or full and it checks if the cell is half > > full to work out the 0 or 1. So unless they randomly put inverters in > > there, an empty cell is an empty cell. > > They seem to do exactly that. Otherwise it's not possible that you get a > manufacturer specific pattern after power on. I thought a had seen an article by Ken Shirriff (http://www.righto.com/) on exactly that matter, but I cannot find it anymore. It might be on another source, though. As far as I remember, there was even given a reason why there is this difference. If I remember correctly, it is the sense amplifier that makes this difference. Perhaps, someone else has more luck finding the article with this hint? Regards, Spiro. -- Spiro R. Trikaliotis http://www.trikaliotis.net/Received on 2020-05-29 22:44:14
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