I designed a small simple board using LPC2387. However, JTAG interface
does not respond to my Wiggler clone. I watched the signals and found
that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
from LPC stays high -I think it is also because of pull up resistor I
placed.
What might be missing? Am I missing to connect some pins to somewhere
to enable the JTAG interface? Or a sequence on boot?
PS: I am really disappointed by Philips' documentation again. I say
again because I've used their different sets of components including
thousands of EURO price tagged xray units. The problem was the same
and the missing information was filled by a lot of talking. When I
started using NXP there I was an afraid of documentation, and I have
more now. I used STR's chips and following the documents my design
just worked at first trial. However for LPC2387 there is unbelievably
small subset of insufficient documents..
JTAG is no working in LPC2387..
Started by ●June 14, 2008
Reply by ●June 14, 20082008-06-14
----- Original Message -----
From: "bilgicini"
To:
Sent: Saturday, June 14, 2008 9:02 AM
Subject: [lpc2000] JTAG is no working in LPC2387..
>I designed a small simple board using LPC2387. However, JTAG interface
> does not respond to my Wiggler clone. I watched the signals and found
> that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
> from LPC stays high -I think it is also because of pull up resistor I
> placed.
>
> What might be missing? Am I missing to connect some pins to somewhere
> to enable the JTAG interface? Or a sequence on boot?
>
> PS: I am really disappointed by Philips' documentation again. I say
> again because I've used their different sets of components including
> thousands of EURO price tagged xray units. The problem was the same
> and the missing information was filled by a lot of talking. When I
> started using NXP there I was an afraid of documentation, and I have
> more now. I used STR's chips and following the documents my design
> just worked at first trial. However for LPC2387 there is unbelievably
> small subset of insufficient documents..
Does the JTAG I/F work with a known functioning board?
Leon
From: "bilgicini"
To:
Sent: Saturday, June 14, 2008 9:02 AM
Subject: [lpc2000] JTAG is no working in LPC2387..
>I designed a small simple board using LPC2387. However, JTAG interface
> does not respond to my Wiggler clone. I watched the signals and found
> that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
> from LPC stays high -I think it is also because of pull up resistor I
> placed.
>
> What might be missing? Am I missing to connect some pins to somewhere
> to enable the JTAG interface? Or a sequence on boot?
>
> PS: I am really disappointed by Philips' documentation again. I say
> again because I've used their different sets of components including
> thousands of EURO price tagged xray units. The problem was the same
> and the missing information was filled by a lot of talking. When I
> started using NXP there I was an afraid of documentation, and I have
> more now. I used STR's chips and following the documents my design
> just worked at first trial. However for LPC2387 there is unbelievably
> small subset of insufficient documents..
Does the JTAG I/F work with a known functioning board?
Leon
Reply by ●June 14, 20082008-06-14
Hi,
A.F.A.I.K, the 2387 is a slightly new part. However, the problem you describe is very similar to what I suffered a couple of months with my first 23xx part, and I know 23xx share lot of same modules inside.
You don't mention the tool you use for programming/debugging through JTAG, but this solved my problem: Reduce clock speed of the JTAG to 100KHz or less, and if possible use the RTCLK option.
Hope this helps.
De:l...
Para:l...
Cia:
Data:Sat, 14 Jun 2008 08:02:43 -0000
Assunto:[lpc2000] JTAG is no working in LPC2387..
I designed a small simple board using LPC2387. However, JTAG interface
does not respond to my Wiggler clone. I watched the signals and found
that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
from LPC stays high -I think it is also because of pull up resistor I
placed.
What might be missing? Am I missing to connect some pins to somewhere
to enable the JTAG interface? Or a sequence on boot?
PS: I am really disappointed by Philips' documentation again. I say
again because I've used their different sets of components including
thousands of EURO price tagged xray units. The problem was the same
and the missing information was filled by a lot of talking. When I
started using NXP there I was an afraid of documentation, and I have
more now. I used STR's chips and following the documents my design
just worked at first trial. However for LPC2387 there is unbelievably
small subset of insufficient documents..
A.F.A.I.K, the 2387 is a slightly new part. However, the problem you describe is very similar to what I suffered a couple of months with my first 23xx part, and I know 23xx share lot of same modules inside.
You don't mention the tool you use for programming/debugging through JTAG, but this solved my problem: Reduce clock speed of the JTAG to 100KHz or less, and if possible use the RTCLK option.
Hope this helps.
De:l...
Para:l...
Cia:
Data:Sat, 14 Jun 2008 08:02:43 -0000
Assunto:[lpc2000] JTAG is no working in LPC2387..
I designed a small simple board using LPC2387. However, JTAG interface
does not respond to my Wiggler clone. I watched the signals and found
that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
from LPC stays high -I think it is also because of pull up resistor I
placed.
What might be missing? Am I missing to connect some pins to somewhere
to enable the JTAG interface? Or a sequence on boot?
PS: I am really disappointed by Philips' documentation again. I say
again because I've used their different sets of components including
thousands of EURO price tagged xray units. The problem was the same
and the missing information was filled by a lot of talking. When I
started using NXP there I was an afraid of documentation, and I have
more now. I used STR's chips and following the documents my design
just worked at first trial. However for LPC2387 there is unbelievably
small subset of insufficient documents..
