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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

> 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.


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