I have a three DSP system (DSP56303pv100), interconected via a Jtag
Chain.
this is because I need to test the hardware conections on my system.
I know that to acces the second DSP in the chain, I have to bypass the
first one.
the question is: when I have my first DSP bypassed, and I try to acces the
second, is there any chance the 1st gets out of bypass mode?? and if it
happends, how can I do to avoid that???
If anyone has worked with something similar, I appreciate any help dealing
with JTAG chain, like steps or tricks, I don't know.
well, thanks. see you.
Hernan
Reply by Irene Sierra●August 4, 20042004-08-04
When you use the ADS or GDS, the debugger will automatically do this for
you.
Down at the JTAG level, to talk to the data
register of one device in your chain, you put the other 2 into bypass by
shifting the BYPASS instruction into their instruction registers. The devices
will stay in bypass until you perform another IR shift. Then they will do
whatever instruction you shift in.
~Irene
Hernan Dario Herrera <h...@yahoo.com>
wrote:
Hi, everyone.
I have a three DSP system (DSP56303pv100), interconected via a Jtag
Chain.
this is because I need to test the hardware conections on my system.
I know that to acces the second DSP in the chain, I have to bypass the
first one.
the question is: when I have my first DSP bypassed, and I try to acces the
second, is there any chance the 1st gets out of bypass mode?? and if it
happends, how can I do to avoid that???
If anyone has worked with something similar, I appreciate any help dealing
with JTAG chain, like steps or tricks, I don't know.
well, thanks. see you.
Hernan
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Reply by Hernan Dario Herrera●August 4, 20042004-08-04
Hi.
yes, it's at lowest jtag level.
But I still don't get one thing.
let's say that I put the 1st DSP in bypass mode. if I need to do a IDCODE
(or a sample/test for example ) instruction on the second DSP, I have to perform
another IR shift, IDCODE, and the 1st DSP gets out of the bypass mode. Am I
right???
thanks
Irene Sierra <i...@yahoo.com>
wrote:
When you use the ADS or GDS, the debugger will automatically do this for
you.
Down at the JTAG level, to talk to the data
register of one device in your chain, you put the other 2 into bypass by
shifting the BYPASS instruction into their instruction registers. The devices
will stay in bypass until you perform another IR shift. Then they will do
whatever instruction you shift in.
~Irene
Hernan Dario Herrera <h...@yahoo.com>
wrote:
Hi, everyone.
I have a three DSP system (DSP56303pv100), interconected via a Jtag
Chain.
this is because I need to test the hardware conections on my system.
I know that to acces the second DSP in the chain, I have to bypass the
first one.
the question is: when I have my first DSP bypassed, and I try to acces the
second, is there any chance the 1st gets out of bypass mode?? and if it
happends, how can I do to avoid that???
If anyone has worked with something similar, I appreciate any help dealing
with JTAG chain, like steps or tricks, I don't know.
well, thanks. see you.
Hernan
_____________________________________ Note: If you do a
simple "reply" with your email client, only the author of this message will
receive your answer. You need to do a "reply all" if you want your answer
to be distributed to the entire group.
_____________________________________ About this discussion group:
