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..
----- 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
Reply by bilgicini●June 14, 20082008-06-14
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..