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Discussion Groups | FPGA-CPU | Insight board (was Re: Yet Another RISC Design (YARD-1A))
This list is for discussion of the design and implementation of field-programmable gate array based processors and integrated systems. It is also for discussion and community support of the XSOC Project (see http://www.fpgacpu.org/xsoc).
Insight board (was Re: Yet Another RISC Design (YARD-1A)) - Mike Butts - Sep 29 23:15:00 2000
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Brian Davis wrote: > > When I first looked at the Insight board, I'd hoped to stick > an external synchronous SRAM on a daughtercard above the FPGA; > alas, in all 160 pins of header there's nary a ground in sight- > I don't think I'll be running any 100 MHz+ bus cycles there. Damn! I have that Insight X2S100 board too, and hadn't looked at the header pinouts yet. I just assumed they'd have grounds. Shame on them! I've been planning on putting a fast SRAM or DRAM or two out there. There aren't any grounds on the top side near the headers, except for a via or two. But there are plenty of good fat connections available on the tantalum caps on the bottom. I may try soldering an SRAM or DRAM down there, dead-bug style with 30 ga wire for the signals. Another kludgy but probably effective cure would be to sacrifice some of the I/Os, and solder heavier solid wire from the tantalum grounds to some of those header pins. Thanks for exposing that rather severe shortcoming of the Insight board. --Mike |
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Insight board (was Re: Yet Another RISC Design (YARD-1A)) - Brian Davis - Oct 1 19:34:00 2000
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--- In , Mike Butts <mbutts@r...> wrote: > Brian Davis wrote: >> When I first looked at the Insight board, I'd hoped to stick >> an external synchronous SRAM on a daughtercard above the FPGA; >> alas, in all 160 pins of header there's nary a ground in sight- >> I don't think I'll be running any 100 MHz+ bus cycles there. > <snip> >Thanks for exposing that rather severe shortcoming of the >Insight board. I do like the Insight Spartan-II demo board; it was the only XC2Sxxx board I could find, and the price was right- it just doesn't look like they had high speed I/O in mind when they laid it out. However, I like the sound of their new Spartan-II PCI card even better: - XC2S150 - XC18V01 ISP configuration PROM - 2M x 32 DRAM - "DIME" expansion headers (plenty of ground and power) - PCI interface - DS-PCI32S-BRD $135.00 USD (board only, no PCI core license) Insight : http://www.insight-electronics.com/solutions/kits/xilinx Nallatech ( creators of the DIME standard ) : http://www.nallatech.com Brian Davis |
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Insight board (was Re: Yet Another RISC Design (YARD-1A)) - Author Unknown - Oct 4 15:26:00 2000
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> I do like the Insight Spartan-II demo board; it was > the only XC2Sxxx board I could find, and the price was > right- it just doesn't look like they had high speed > I/O in mind when they laid it out. > > However, I like the sound of their new Spartan-II PCI > card even better: > > - XC2S150 > - XC18V01 ISP configuration PROM > - 2M x 32 DRAM > - "DIME" expansion headers (plenty of ground and power) > - PCI interface > - DS-PCI32S-BRD $135.00 USD > (board only, no PCI core license) > Insight : > http://www.insight-electronics.com/solutions/kits/xilinx > > Nallatech ( creators of the DIME standard ) : > http://www.nallatech.com We just got an AVNETmarshall Xilinx Development System (DS-FND-EXP-PC-SK-B/B) XCV-300 on a PCI-64bit card.) The board exports 50 general purpose I/Os through some exotic AMP connector (#177983-4), pretty much consigns us to buying a PCI receptable, and tapping test-wires out of the PCI edge connector. (Unless someone here knows of a company which makes an Amp 177983-4 -> 'standard I/O header' cable.) The development board with Foundation Express 2.1i costs $2495. (You get free updates to the latest version for 1 year, when you register the software with Xilinx.) Considering that the Foundation Express sells for $2000 by itself, we thought it was a good deal (since we need the Foundation Express software.) We might give Insight's boards a try. Is Nallatech's website password protected? I can't seem to access it. |
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