Re: Configuration Spartan 3

"luigi" <luigi.zadra@xxxxxxxxxx> schrieb im Newsbeitrag
news:1138031781.352244.275760@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi
> We work with a XCF01S and a Spartan 3 XC3S200.
> JTAG works with 2.5V, Spartan Vcco (INIT_B and DIN/D0) has 3.3V. The
> connections between XCF and Spartan are according the application note
> for 3.3V output (INIT_B) to 2.5V input CE/RES.
>
> Programming the Flash and booting from Flash works fine.
> Programming the FPGA works only, when we have the same code in the
> Flash.
> When we try to load a different code (as is in the Flash) per JTAG to
> the FPGA, the FPGA doesn't start up.
>
> Does anybody know what's going wrong?
>
> Luigi
>
yes. I know ==> I am anybody am I? :)

there is xilinx AR on this, their suggested solution is to change FPGA MODE
pin setting.

similar or even worse happens with S3e and Parallel flash, the configuration
from Parallel flash
(if located at close to the start address) prohibits the FPGA from being
configured over JTAG
and as Flash programmer over FPGA JTAG indirect so flash programming also
fails.

we have special workaround for this that puts the parallel flash into read
id mode and clears
FPGA config and then reconfigures FPGA with Flash programming IP and then
programs flash.

for Platform flash, you must erase platform flash and force FPGA
reconfiguration then it will
be possible to reconfigure over JTAG again




--
Antti Lukats
http://www.xilant.com


.

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