Hi,
there is a new driver for magnetoresistive MRAM (Everspin) MR25H40, 512kBytes, 8pin.
Together with below FRAM (Ramtron, now Cypress) this is a great solution when you require a nonvolatile external 8pin SPI memory
with up to 40/50Mhz SPI clock and write such fast as read (no write delays like eeprom/flash, no page buffers).
Unlimited endurance.
Could be used as a standard SPI sram, but nonvolatile (no external backup battery needed).
Now we need a tiny filesystem written in forth :)
Igor
______________________________________________________________
> Od: "om1zz" <om...@vo...>
> Komu: "flashforth-devel" <fla...@li...>
> Datum: 26.05.2015 10:40
> Předmět: Re: [Flashforth-devel] SPI FRAM memory drivers
>
>Hi, much more optimized code there. WR/RD bytes, words, doubles and quads into/from FRAM, speeds up to 300kB/sec with quads at 27MHz Fcy. I may try with my magnetic MRAMs, but a microscope needed for the soldering job :)
>Igor
>
>______________________________________________________________
>> Od: om1zz <om...@vo...>
>> Komu: "flashforth-devel" <fla...@li...>
>> Datum: 24.05.2015 19:33
>> Předmět: [Flashforth-devel] SPI FRAM memory drivers
>>
>>Hi, at
>>https://github.com/igor-m/flashforth/tree/master/examples
>>are examples of SPI drivers for FRAM SPI memory (byte, word, double access) working with dspic33fjgp128/pic24 etc.
>>It is a quick hack to see how the stuff works, and it works.
>>Needs to be optimised a bit however, asm must be used where applicable in order to speed the stuff up.
>>My memories are over 64kB so they have got 3 bytes long address. Currently there is a block number (64kB per block) and an address within 64kB. Mind you have to care about proper alignment as the address step is 1 or 2 or 4 for above types.
>>More in sources.
>>Igor.
>>
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