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Posts: 135
Registered: ‎12-06-2016
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big memory with 32Bit CPU

Hi anybody experice with big memory for EFR32 ?

I need => 32 GByte.

What tecnology ist easy to interface and cheap ?

 

Thanks

arnold

Posts: 246
Registered: ‎11-17-2013

Re: big memory with 32Bit CPU

SD card via SPI is the cheapest solution for multi- GB memory.

Posts: 492
Registered: ‎09-18-2015

Re: big memory with 32Bit CPU

[ Edited ]

@Turbo_J is spot on.

 

The only other thing close would be raw NAND components, and you'd have to manage the ECC, which is a huge mess now that high-density NAND is having to move to LDPC or a comparable algorithm.

 

Why the SD Association hasn't dropped the legacy SPI mode for SD cards (as JEDEC did with eMMC), I'll never understand, but it manages to keep the handful of MCU users happy that need a way to store more data than a SPI flash can manage.

 

John

Posts: 135
Registered: ‎12-06-2016

Re: big memory with 32Bit CPU

Thanks for response.

 

I talked with different suppliers of memories.

They recomended the same to me.

So I will use SD - Card with SPI.

There is an other interface for SD-Cards with a 4 Bit parallel interface.

But you will have to pay for the rights to use it.

In the Sd-Cards is a controller allready integreated, so the most basic managment is done by hardware already. The price for a good quality is les than 30€ for 32 GByte !

There is only one problem left:

Do anybody know a libary for the file system on EFR32 ?

Posts: 246
Registered: ‎11-17-2013

Re: big memory with 32Bit CPU

Simplicity Studio has a FATFS port included. Should work with EFR32, too.

Posts: 135
Registered: ‎12-06-2016

Re: big memory with 32Bit CPU

thanks,

 

can you give me a help where to find it ?

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Posts: 492
Registered: ‎09-18-2015

Re: big memory with 32Bit CPU

Hi @zender64,

 

You'll want to take a look at AN0030, which is our FAT on SD app note.

 

Unfortunately, the example code runs on the EFM32-Gxxx-DK, so you'll need to do some porting work to run it on EFR32.

 

On the flip side, EFR32's peripherals are a superset of those on the original Gecko device, so all of the hardware you need is there.

 

We probably ought to do a SD expansion board for our STKs, that way it would be a simple matter to port the FAT on SD app note to our other devices in the future.

 

John