[hpsdr] JTAG Mercury programming problem.

[Graham / KE9H]

Several Comments:

If you are programming Mercury directly with a Byte Blaster, or clone,
you should jumper out R10, or replace it with a 22 Ohm resistor (marked 
220). 
It shipped from the factory with a 220 Ohm resistor (marked 221).
Some will work, some will not work with the 220 Ohm resistor in place.

If you are programming Mercury directly with a Byte Blaster, or clone, 
you go
in on the "PROM CONFIG" connector, J4, because you are actually programming
the serial PROM.  The FPGA will get the program from there at power up.

If you are programming Mercury directly with a Byte Blaster, or clone,
you should use the ".pof" file, and set the "Mode" to "Active Serial 
Programming,"
NOT JTAG, because you are actually programming an external serial PROM.

The Files that reference a JTAG chain are for programming the Serial PROM
via the JTAG chain using the FPGA and OZY configured as a Byte Blaster,
which is an entirely different process, in which case you use the ".jic" 
files.

It is also possible to program the FPGA directly, but if you do that, 
you will
loose the program every time that power is turned off, because it will 
not be
stored anywhere on the Mercury card.

--- Graham

==
Johan Maas wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>   
>
> ------------------------------------------------------------------------
>
> Hi All,
>  
> Iam following the lectures of Kirk; very good!
>  
> He placed the mercury and ozy code using the nwire connections on the web.
>  
> Now iam trying to program the mercury via JTAG; resulting in the 
> message "Can't access JTAG chain"
>  
> Iam using a clone USB programmer (link to ebay from the hpsdr reflector).
>  
> I tried the JTAG debugging option which results in :
>  
> Uncertain JTAG chain
> info: Detected 1 device(s)
> info Device 1: EP3C25
>  
> The programmer detects the device but seems not able to program via 
> JTAG the FPGA.
>  
> Programming the prom is working correctly.
>  
> Also the programming of OZY using JTAG worked.
>  
> Are there other using the clone USB blaster and having problems 
> programming the Mercury FPGA and solved the problem?
>  
> 73 Johan PA3GSB
>  
> ------------------------------------------------------------------------
>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at hpsdr.org
> Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
> HPSDR web page: http://hpsdr.org
> Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/
>   


 1237936519.0