Jie Zhang wrote:
> On Sun, Jul 10, 2011 at 12:14 PM, Walter F.J. Mueller
> <[email protected]> wrote:
>> Error svf: SIR command length inconsistent.
>>
>> It is caused by the second last svf command
>>
>> SIR 14 TDI (3fff) SMASK (3fff) ;
>>
>> but it is not clear to me what's wrong here. I added some more info
>> to the error message to find out the the message is issued because
>>
>> priv->ir->value->len is 6
>
> So Instruction Register is 6-bit
>
>> len is 14
>>
>> It's obvious that the length field as well as the constants involved
>> in the failing SIR command are 14, and it's not clear to be the svf
>> engine expects something of length 6 here.
>>
> SIR (Scan Instruction Register) Performs an IEEE 1149.1 Instruction
> Register scan.
>
> So the above SIR command tries to scan 14-bit data into the 6-bit
> Instruction Register.
Thanks for the fast response !
That describes why the code at this point generates an error.
But a 'detect' command shows
IR length: 14
Chain length: 2
and a 'discovery' command also gives
Detecting IR length ... 14
So the JTAG chain definitely has an IR of length 14, and the SIR instruction
in the svf file tries to write 14 bit, which seems to be reasonable.
So I wonder a bit why priv->ir->value->len has a value of 6.
One thing I didn't mention in my initial posting is that the 'svf' command
produces some warnings
Warning svf: command TIR not implemented
Warning svf: command TDR not implemented
Warning svf: command HIR not implemented
Warning svf: command HDR not implemented
There are indeed TID, TDR, HIR and HDR commands in the svf file created by
the Xilinx impact tools.
Is it safe that these svf commands are apparently parsed but ignored ?
Is that the reason that jtag gets confused about the IR length ?
With best regards, Walter Mueller
------------------------------------------------------------------------------
All of the data generated in your IT infrastructure is seriously valuable.
Why? It contains a definitive record of application performance, security
threats, fraudulent activity, and more. Splunk takes this data and makes
sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-d2d-c2
_______________________________________________
UrJTAG-development mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/urjtag-development
