In normal mode,the /TRST pin should be pulled high, and only
when entering debug mode,should this pin asserted with /RESET
signal.But I notice the schematics coming with the DSP56f807EVM
User's manual,that the signal J_TRST is pulled low,which means the
output pin TRST which is designed as RST=/POR * /J_TRST should be
normally low,if /POR is left floated,can anyone explain it?
Wish every one a happy New year!
Reply by Hutchings William-p23437●January 6, 20032003-01-06
The /TRST signal resets the JTAG tap controller. The /TRST signal
should help low in a system operating in normal mode with no equipment attached
to the JTAG port. If allowed to float the part can end up accidently capturing
invalid signals via the JTAG interface and placing the part in a debug mode when
this is not intended. Thanks.
- Bill
-----Original Message----- From: c...@mails.tsinghua.edu.cn
[mailto:c...@mails.tsinghua.edu.cn] Sent: Friday, January 03, 2003
11:16 PM To: m...@yahoogroups.com Subject: [motoroladsp]
ask help about the TRST pin of dsp56f807
In normal mode,the /TRST pin should
be pulled high, and only when entering debug mode,should this pin asserted
with /RESET signal.But I notice the schematics coming with the
DSP56f807EVM User's manual,that the signal J_TRST is pulled low,which
means the output pin TRST which is designed as RST=/POR * /J_TRST should
be normally low,if /POR is left floated,can anyone explain it? Wish every one a happy New year!
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