Other NXP ProductsのトピックRe: MRAM Serial access

MRAM Serial access

renatocosfer — Wed, 08 Aug 2007 20:44:08 GMT

Is there any plan to improve a I2C/SPI MRAM to use with low pin-out microcontrollers ?

Re: MRAM Serial access

bigmac — Thu, 09 Aug 2007 11:03:28 GMT

Hello,

Please refer to the following post to see whether it provides the information you need.

http://forums.freescale.com/freescale/board/message?board.id=8BITCOMM&message.id=4554

Regards,

Mac

Re: MRAM Serial access

renatocosfer — Thu, 09 Aug 2007 20:56:38 GMT

Thanks BIGMAC.

I was searching for this 2 options sometime:

-Nanoamp: Serial SRAM / 32kB / ultra low power back up supply, and

-Ramtron : FRAM

Well, about FRAM I was understanding that it has a limited number of read-write cycles, same

as Flash, but now I see on datasheets that it is "unlimeted" number of cycles.

So, it´s an option. Ramtron has up to 64kB/8 pin devices.

Re: MRAM Serial access

renatocosfer — Thu, 09 Aug 2007 22:08:34 GMT

The issue are:

- FRAM is expensive yet : 64kB ~ $10

- Some papers inform that number of read-write cycles are ~ 1,000,000,000,000 times.

Comments ?

Re: MRAM Serial access

rocco — Fri, 10 Aug 2007 03:30:26 GMT

Hi Renatocosfer,

renatocosfer wrote:
- Some papers inform that number of read-write cycles are ~ 1,000,000,000,000 times.

I had not heard this before, so I wrote a little test program. The program writes/reads every millisecond, for 1000 cycles per second. I will let you know the results in about 32 years.

Re: MRAM Serial access

renatocosfer — Fri, 10 Aug 2007 03:49:47 GMT

Ok Rocco:

Virtually unlimited so, if that´s right.

With 100,000 times the massive read-write cycles is not possible.