HP-48 FRAM Cards

[snrowe]

(07-23-2016 01:22 AM)Dave Frederickson Wrote:  

(07-23-2016 01:00 AM)snrowe Wrote:  Hi David,

I researched FRAM about a year ago and the information I came across claimed FRAM has a destructive read which is followed by a write to write the data back after reading. I don't have all the references handy as I read up on it a while ago, but the article I posted above claims FRAM is destructive read.

If you have information to the contrary I'd love to hear it as I'd like to put my cards back in action without worrying about wearing out the memory from running programs off the card.

Snrowe,

Okay, so a write-after-read architecture does have more read and write cycles compared to flash, but FRAM can endure more than 10 billion times the number of read/write cycles as flash. 150,000 years is a lot longer than your 48SX will ever last.

Dave

Flash doesn't have a destructive read, so reading Flash memory doesn't wear it out, only writing to it can do that. 150 years is the data retention time. Fatigue life is driven by number of read and writes while on Flash its just driven by the number of writes.