Electronics > Beginners

SPI SRAM

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David Hess:

--- Quote from: Tom Harker on July 15, 2018, 06:07:25 pm ---As for compression, and this is likely the wrong approach, it will be done in 'real time' so two bytes in, two bytes out - that doesn't really allow for compression as far as I understand it.
--- End quote ---

Some form of ADPCM (adaptive differential pulse code modulation) may be suitable.  At the very least, u-law or a-law compression could be used.

http://www.drdobbs.com/database/algorithm-alley/184410326

I see that 2Mbit SPI SRAMs in 8 pin packages are a reasonable cost but 40 Mbits of required storage is going to make that uneconomical leaving some form of Flash memory.  I would lean toward either SPI NOR Flash or an SD or microSD card.

Tom Harker:
I'm planning on interfacing the SRAM with a micro-controller by SPI, possibly an ATMEGA16 because it has plenty of pins for chip select. I'm using SPI because it is simple and I'm using it elsewhere already.

Tom Harker:
I'm not familiar with ordering samples. How does this work? I assume they wouldn't just give away 10 RAM chips? There's a 'comments' input on the ISSI sample request form, what info do they need?

Benta:
Greenhorn, eh?

Just say you're an engineer hired as consultant on a project for a major company. You're contractually not allowed to say more, except that it's to do with industrial control.

You'll get your samples, but expect a phone call at some point.

Tom Harker:
I think I'm out of luck on this one, none of ISSI's suppliers have the part and it appears as 'no inventory' on their product list.

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