Are there any boards with external SRAM/SDRAM available ?

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jason
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Re: Are there any boards with external SRAM/SDRAM available ?

Postby jason » Fri Dec 10, 2010 4:03 pm

ale500 wrote:I got my L1s today... they are (no women around... no) beautiful :) Now to get a board out of the door...
LOL, if we had a favourite XCore.com quotes section, I would add that to it :-)

Good luck with getting your board out the door :-)
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Berni
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Postby Berni » Fri Dec 10, 2010 5:43 pm

Haha a good quote quote for sure.

Oh and i hope the project really ends up going out the door and not the window(like quite a few of mine)
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Postby ale500 » Wed Dec 15, 2010 6:26 pm

I redesigned th board to be stamp like. It has two rows of 2mm separated pins and a XTAG-2 connector. Only the basics remain, L1-TQFP128, Flash, power supply, reset and maybe I'll add a footprint for a uSD socket. I'm planning on having also a "mainboard" with the rest of the components. I wanted a SRAM but it does not fit on the underside due to the amount of capacitors there... I want something now but the end of the year means PCBs will be delayed some two weeks...
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TonyD
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Postby TonyD » Thu Dec 16, 2010 10:19 am

it sounds like its going to be a great little board 8-) . I like the idea of the uSD socket

I'm looking forward to seeing the pics when you get the PCB's back.
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Postby ale500 » Thu Dec 16, 2010 10:29 am

Here is an image of the PCB (it measures 58x40 mm):

Details (please check):

LM1117-3.3 regulator with 10 uF ceramic plus 12x100nF for VCCIO, crystal and TPS3808
TPS62260 switching regulator (from 3.3 V) to 1V with 2x10uF ceramics plus 10x100nF close to the VCC pins.
TPS3808-0.9 Reset generator with push-button
XTAG-2 connector, only JTAG connected, no link and no UART (would be UART here a good idea?)
All port pins brought to 2x38 2mm headers
uSD card slot, pins shared with SPI FLASH except for CS
SPI flash in SO-8 pkg.
Miniature crystal oscillator with decoupling cap :)
XS1-L1-TQFP128
And the most important part of all... a LED!!!! :)
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Folknology
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Postby Folknology » Thu Dec 16, 2010 1:28 pm

ale500 This looks like a handy little board for L1 - 128 work, bonus for providing most of the IO ports unlike the stingy XKI.

Nice work

regards
Al
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Postby ale500 » Thu Dec 16, 2010 3:23 pm

I reduced the size to 50x40 mm :) So I can get some boards to test and some to give away if someone is interested. I have to produce also a mainboard with extra features, but the first step is done :)
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Postby ale500 » Wed Dec 22, 2010 7:42 am

I got my XTAG-2 yesterday... It doesn't have a LED !!!! I have to get a case for it... so nacked is no good :). The board have to wait tiöö the new year because the shops are now closed...
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Postby ale500 » Thu Jan 06, 2011 1:03 pm

Well, the boards habe been routed and have been sent for production. I'll get 4 stamps and 4 mainboards.

Here is a picture of the panel with 2 MB and 2 Stamps. Now... just 15 days to go :)

Mainboard includes:

3.3V Regulator
1.2 V Regulator
256kx16 for XS1
256kx16 for FPGA
XC3S50AN FPGA
VGA port with 4 bits per color to FPGA
JTAG port FPGA
17 pin connector to Rayman's 4.3" TFT breakout board
Connector for XS1-Stamp
Connector with 18 FPGA IOs
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Folknology
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Postby Folknology » Thu Jan 06, 2011 5:43 pm

Looks really cool, what do you plan to do with it?

regards
Al

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