RAM programming by JTAG (i need some serious help)
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RAM programming by JTAG (i need some serious help)

 
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Michel Bieleveld
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Posted: Sun Dec 19, 2004 2:16 am    Post subject: RAM programming by JTAG (i need some serious help) Reply with quote
I am trying to achieve something that probably thousand have done
before me. I want to program a sram module that is attached to my fpga
(xc2s300). I have a parallal cable programmer that is compatible with
imPact. Now i am wondering what do you use (software/hardware) to
program ram by jtag. There must be an easy way !?

Michel Bieleveld.
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Daniel Nilsson
Guest
Posted: Mon Dec 20, 2004 1:05 am    Post subject: Re: RAM programming by JTAG (i need some serious help) Reply with quote
Michel Bieleveld wrote:
Quote:
I am trying to achieve something that probably thousand have done
before me. I want to program a sram module that is attached to my fpga
(xc2s300). I have a parallal cable programmer that is compatible with
imPact. Now i am wondering what do you use (software/hardware) to
program ram by jtag. There must be an easy way !?

Michel Bieleveld.

Hi.
I am not sure how your particular FPGA implements its JTAG interface,
but you can probably obtain control of the pins on the FPGA (the ones
that connect to your RAM) by clocking in and out serial data through the
JTAG port (IEEE 1149.1 standard). I used a homemade substitute of the
parallell-programmer to write data into flash memories attached to a MCU
this way. I rewrote the code found on
http://www.lart.tudelft.nl/projects/jtag/ to suit my particular hardware
configuration.

Hope this helps you find a solution.

Redards
Daniel Nilsson
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John LeVieux
Guest
Posted: Mon Dec 20, 2004 10:43 pm    Post subject: Re: RAM programming by JTAG (i need some serious help) Reply with quote
You can purchase boundary scan software tools from Universal Scan that
can do this. See http://www.universalscan.com/ for details.

John
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Subra
Guest
Posted: Tue Dec 28, 2004 9:26 pm    Post subject: Re: RAM programming by JTAG (i need some serious help) Reply with quote
We're using Eclipse from Intellitech for doing this. It works with
Xilinx cables.
The software has models of SRAMs and
FLASH in a library for automatically performing uploads/downloads
to/from memories connected
to an FPGA.
http://www.intellitech.com/products/eclipseboundaryscan.asp
There's also a memory test feature to check the connections before
trying to program and it gives
really good diagnostics to find the open pins.
If speed is important you might also want a faster jtag controller.
we use http://www.intellitech.com/products/ultratestaccessport.asp
It's expensive though, compared to Xilinx, US$2K, but is faster and has
some digital inputs and outputs which
can speed up FLASH programming.

Subra
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