> On Dec 15, 2018, at 7:09 PM, allison via cctech <cct...@classiccmp.org> wrote: > > On 12/15/2018 01:01 PM, Guy Sotomayor Jr via cctech wrote: >> FRAM or MRAM. I make extensive use of them in my projects. >> >> Everspin has a few (all SMT and 3.3v). As I recall they run ~$20/ea for 4Mb >> (512K x 8 or 256K x 16). >> >> TTFN - Guy >> >>> On Dec 15, 2018, at 1:22 AM, Rod G8DGR via cctalk <cctalk@classiccmp.org> >>> wrote: >>> >>> I have an idea to produce an MM-8 clone using RAM that acts like core when >>> turned off. >>> Can anybody suggest a chip that will do this? >>> >>> Rod Smallwood >>> >>> > Flash, EEprom and Magnetic FRAM and MRAM) types > have many unacceptable > properties for a random access read write memory.
I think you’re mistaken about FRAM and MRAM. They are byte oriented devices and are designed to replace SRAM + battery. Which in my mind makes them preferable as they reduce parts count. The current MRAM has unlimited write endurance (same as SRAM) and depending upon the part is 35-55ns access/cycle time. FRAM has a similar access time but requires an internal restore so it’s cycle time is about 2x (one of the reasons I prefer MRAM now). TTFN - Guy
