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Re: CB030, A 68030 SBC for hobbyists [message #7283 is a reply to message #7279] Tue, 17 March 2020 18:28 Go to previous messageGo to previous message
plasmo is currently offline  plasmo
Messages: 916
Registered: March 2017
Location: New Mexico, USA
Senior Member
Mike,
At 24MHz clock, the refresh rate for 64meg DRAM is 43mS. Most 64meg DRAM needs a 64mS refresh rate although some parts may need faster refresh rate, but like Mike Smith said, the refresh rate is extremely conservative; it is only an issue in extreme process/voltage/temperature corner. You should not have refresh issue in room temperature.

Do run the memory test multiple iterations. Each iteration uses a different seed values so each iteration tests different population of memory cells.

Perhaps we can swap 64meg; I can ship you a 64 meg SIMM that I believe is working and you can ship your questionable 64meg SIMM to me. I'll PM you my address

Bill

PS, with updated CPLD are you able to run Transcend CF disk and other disk you had problems with?
 
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