RE: Re: Programming FPGA

I can't send you a file here, I'll send one to your email.

For others who are reading this, the FPGA we are using is a Xilinx XC3S700-4FG400.  This one (there may be others as well) has a built in SPI programming capability.  We also included JTAG capability for design testing.  It took a couple of jumpers and an extra glue chip or two, but it works.

-Pete F
 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of seecwriter
Sent: Wednesday, January 09, 2013 7:11 PM
To: [email protected]
Subject: [rabbit-semi] Re: Programming FPGA

Pete,

I'm looking into this again. We are using a XC95288XL CPLD. Once we get this working we'll move on to an FPGA.

Looking at AppNote 058 sample code, it bit thumps the JTAG pins. And it appears that a hardware SPI would not work because it changes modes by setting TMS and toggling TCK once. You can't do that with HW SPI.

What data type did you use?

Steve

--- In [email protected], "Fournier, Peter"  wrote:
>
> Last time we tried this, we discovered that the JTAG spec would have 
> cost us a lot of money.  The faster solution was to use SPI to the FPGA.
> I don't know which device you are using and whether it can do SPI, but 
> I think that is how the flash based devices work.  We are using the 
> xc3s700.
> 
> -Pete F
>  
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of seecwriter
> Sent: Thursday, March 17, 2011 3:17 PM
> To: [email protected]
> Subject: [rabbit-semi] Programming FPGA
> 
> I have a requirment for a Rabbit to program a flash-based Xilinx FPGA 
> via a JTAG interface. The Rabbit would receive the data file via a 
> serial port and program the FPGA via its JTAG port. I've found alot of 
> info on using a JTAG port, but nothing that defines how to implement 
> the interface.
> 
> Does anyone know where I can get that level of detail? And words of 
> wisdom from anyone who's done this before are always welcome.
> 
> Steve
> 
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
>




------------------------------------

Yahoo! Groups Links