• State Accepted Answer
  • Locked Locked
  • Replies 2 replies
  • Subscribers 119 subscribers
  • Views 4867 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Driving nTRST and nSRST signals through ARM DS-5

Amit

Hello All,

              I have connected my target board via a JTAG connector to ARM DStream and using ARM DS-5 to debug it. I would like to know the mapping of nSRST and nTRST reset signals of ARM DS-5 eclipse environment. Does Connect/Disconnect to target drive the nTRST signal and Reset.system drive the nSRST signal through DS-5 ? Please correct my understanding if I am wrong.

Also, I would like to know is there any other method (any command line utility) to drive these signals without ARM DS-5 ? Please help. Thanks in advance.

  • 0 Arm Employee Badge

    Hi amitm,

    The behaviour of DS-5 and DSTREAM on first connection and on reset with reset.system is determined by the settings in the ".rvc" file for your target board, which contains entries like this:

                <ResetOperation Type = "UInt32">0</ResetOperation>

                <TResetOnInitConnect Type = "UInt32">1</TResetOnInitConnect>

                <SResetOnInitConnect Type = "UInt32">0</SResetOnInitConnect>

                <ResetHoldTime Type = "UInt32">100</ResetHoldTime>

                <PostResetDelay Type = "UInt32">1000</PostResetDelay>

                <nTRSTHoldTime Type = "UInt32">10</nTRSTHoldTime>

                <nTRSTPostResetTime Type = "UInt32">10</nTRSTPostResetTime>

                <DoSoftTAPReset Type = "UInt32">1</DoSoftTAPReset>

                <Linked_SRST_TRST Type = "UInt32">0</Linked_SRST_TRST>

                <AllowICETAPReset Type = "UInt32">1</AllowICETAPReset>

                <AllowICELatchSysRst Type = "UInt32">1</AllowICELatchSysRst>

    These settings are described in the "ARM DS-5 Using the Debug Hardware Configuration Utilities", section "Debug hardware Advanced configuration settings":

    http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0498h/CEBBFAJI.html

    If you need to change these settings, you can do so simply editing this file using a text editor.

    Alternatively, if you would like to create a fresh ".rvc", you can do so using DS-5's Debug Hardware Configuration utility (dbghwconfig).  This also allows you to customise the reset behaviour via its "Advanced" tab - see screen-shot below and:

    "ARM DS-5 Using the Debug Hardware Configuration Utilities", section "Configuring the debug hardware Advanced settings"

    http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0498h/CIHGABDH.html

    Hope this helps,

    dbghwconfig.png

    nSRST and nTRST can also be driven directly from the command-line using the "CSAT" tool. 

    See the CoreSight Access Tool (CSAT) User Guide

    http://infocenter.arm.com/help/topic/com.arm.doc.genc008687b/GENC008687B_csat_user_guide.pdf

    Section 4.25 Reset Target.

  • 0 in reply to Stephen Theobald

    Thanks a lot Stephen for answering my query.