I know that Ramtron has licensed their technology to other companies, but I don't think it is for them to second source Ramtron product. Rather, it is for the other companies to use the technology in their own products. For example, somebody might develop an FPGA or PLD which uses FRAM to program it. Bob Ammerman RAm Systems ----- Original Message ----- From: "Bob Axtell" To: Sent: Monday, August 25, 2003 7:01 PM Subject: Re: [PIC:] Nonvolatile memory and corruption > My understanding is that RAMTRON _HAS_ licensed some other companies to > manufacture their product line, as a second source. But not all products > will be second-sourced. > > But in my code, I allow other devices (including Microchip's) to be > useable; they'll just be slower (delayed by the write time). The read time > is the same, but R/W are limited. > When I MUST use something other than FRAM, I write the data THREE TIMES, > then extract the data as "best two of three", i.e. use the packet that is > identical twice. It allows the use of EEPROM when a FRAM should be used. > For example, suppose the data saved is '0123456789', which is written > identically three times. Assume that due to data cell breakdown I read back > '000' (3 of 3, OK) '011' (2 of 3, OK), '222' and so on. When I find a > difference between the first 2, I check the third. If ALL 3 are different, > I post an error and ask the user to call a technician. > > --Bob > > At 04:57 PM 8/25/2003 -0400, you wrote: > >FYI only: > > > >Maybe this may help someone who is interfacing PICmicros with nonvolatile > >memory: > > > >I'm sure many of you use some sort of nonvolatile memory with PICs -- there > >is a good article written by Christopher Leddy related to the subject of > >this post at www.embedded.com: > > > >More specifically: > >http://www.embedded.com/showArticle.jhtml;jsessionid=HPZ0HKC3MPPKWQSNDBCCKH 0 > >CJUMEYJVN?articleID=13100883 > > > >Embedded Systems Programming also had a good article about this subject in > >their magazine somewhere around 1997 to 2000, I'll try to remember to post > >the title if I can find it. > > > >Very good reading when trying to deal with good 'ol Mr. Murphy! > > > >Side note: > >As fans of FRAM devices from Ramtron (www.ramtron) have already pointed out, > >FRAM write times are an order of a magnitude less than the typical write > >times of standard serial EEPROMs, which helps greatly in preventing > >corruption due to brownouts or power failures. I hope that Ramtron has a > >second source by now -- being a single source part was only thing that > >prevented me from using them at the time. Maybe things have changed since > >then... > > > > > >Take care, > > > >Ken Pergola > > > > > > > > > > > > > >-----Original Message----- > >From: pic microcontroller discussion list > >[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of tim_webb@AGILENT.COM > >Sent: Monday, August 25, 2003 4:24 PM > >To: PICLIST@MITVMA.MIT.EDU > >Subject: Re: [PIC:] WARNING: Dangerous PIF attachement in email from PIC > >l ist > > > > > >I have been getting about 150 emails a day from the virus and not one email > >was from anybody that I know. And about once an hour, I get an email that > >appears like I sent it but it came back as undeliverable. I checked my > >computer with the latest anti-virus and scanned all drives and no virus was > >detected. > > > >-----Original Message----- > >From: Dave VanHorn [mailto:dvanhorn@CEDAR.NET] > >Sent: Monday, August 25, 2003 12:49 PM > >To: PICLIST@MITVMA.MIT.EDU > >Subject: Re: [PIC:] WARNING: Dangerous PIF attachement in email from PIC > >list > > > > > > > > > >2. If Olin says he sees 4-5 a week it makes me wonder what his wonderful > > >system makes of the remaining 5-6 a DAY that should be going through it > > >(based on what others and I see). It would be too good to hope that his > > >wonderful system just deletes them silently. > > > >I probably get 5-6 an hour, or thereabouts. > >I just delete them. > >There's a bunch of virii in my attachment directory, awaiting the big > >flush, but since I have no problem of disk space, and they're about as > >dangerous as a light grenade, I haven't gotten around to it recently. > > > >I did get virused ONCE, using eudora. I clicked on the attachment. > >In my own defence, I was deathly ill with pancreatitis, and the morphine > >drip wasn't doing my critical thinking any good. > > > >-- > >http://www.piclist.com hint: PICList Posts must start with ONE topic: > >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > >-- > >http://www.piclist.com hint: PICList Posts must start with ONE topic: > >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > >-- > >http://www.piclist.com hint: PICList Posts must start with ONE topic: > >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > -------------- > Bob Axtell > PIC Hardware & Firmware Dev > Tucson, AZ > 1-512-219-2363 > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads