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Re: [Discuss-gnuradio] USRP and 100-pin Cypress chipset


From: Eric Blossom
Subject: Re: [Discuss-gnuradio] USRP and 100-pin Cypress chipset
Date: Sat, 27 Dec 2003 17:06:36 -0800
User-agent: Mutt/1.4.1i

On Sun, Dec 21, 2003 at 05:45:01PM -0500, address@hidden wrote:
> 
> The main question I have is how important the 128k of SRAM is. On my second
> version of the boards I had made, I used teh 100 pin variant, which doesn't
> have the address pins brought out. Is there any hope of working with just
> the 8k of internal RAM?


We didn't need the external RAM.  We're currently using only about 6K
out of the 8K available.  The next board turn won't have the external
memory. 

> 
> You might also be interested in a piece of hardware that NIST has designed:
> http://www.nist.gov/smartspace/toolChest/cmaiii/
> Basically, it's an FPGA hooked up to 64 individual microphones, which feeds
> the data out via 100Mbit ethernet. It's entirely implemented in the FPGA,
> with the addition of some RAM, though they're not really using the RAM since
> retransmissions are impractical at the data rates they're working at.
> It's hosted on a Linux box, and has a nice toolkit for array processing.
> The lab I work for has been loaned one of these for research purposes. In
> small quantities, the fab cost is around $900/unit.
> 
> You guys are doing great stuff here, and I look forward to being able to play
> with live signals affordably.

Thanks,
Eric




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