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

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] USRP and 100-pin Cypress chipset
Date: Fri, 26 Dec 2003 00:24:17 -0800
User-agent: Internet Messaging Program (IMP) 4.0-cvs

Quoting address@hidden:
> I was looking through the USRP info, and am very excited at what I see.
> A few months ago, I did a little bit of preliminary work playing around
> with the Cypress chipset you're using. I ended up with two problems.
> The 128 pin version was extremely irritating to solder. Also, I am
> far more a software person than a hardware person. When I saw that some
> experienced people were working on the USRP, I figured that I would wait
> till it was done and then build a few of them for myself.

Hopefully it wont be more than a couple of months now.

> 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? I'm generally going to only be doing input, and
> would be willing to deal with only a single channel, although I am
> interested in doing direction finding, which would be made easier with
> two or more inputs.

Actually we never used the external RAM, so the final version of the boards will
not have the RAM, and will use the 100-pin version.

> You guys are doing great stuff here, and I look forward to being able to play
> with live signals affordably.


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