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
> 
> 
> 
> ------------------------------------
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