TMS570LS1227: Can we connect the nTRST to lauterbach debugger directly?

Saijun Zheng

Part Number: TMS570LS1227

Now we use the lauterbach debugger's ARM JTAG 20Pin to connect the HDK of TMS570LS12xx, for the port nTRST, does it connec the debugger to the TMS570LS12xx in its HDK directly?Thank you!

over 6 years ago

0 Miro over 6 years ago

TI__Mastermind 21425 points

Hello,
TMS570LS12x HDK uses ARM-20 connector.
Here you can find pinout for this connector: processors.wiki.ti.com/.../f1252489780-1150881050.html

Check this for pin to pin connection: processors.wiki.ti.com/.../Tms570ls12_schematics_reve.pdf

JTAG connector is on page 21 and MCU nTRST wiring is on page 7.

Best regards,
Miro

0 Saijun Zheng over 6 years ago in reply to Miro

Prodigy 60 points

Hello,

Thank you for your response quickly!

I discribled my question in the below picture.

So could you check it again?

Thank you again!

Best Regards,

Saijun Zheng

0 Miro over 6 years ago in reply to Saijun Zheng

TI__Mastermind 21425 points

Hello,
nTRST on MCU has internal pull-down which is holding JTAG TAP port in reset . JTAG emulator should pull this pin high in order to debug the device. You don't need external circuitry (some JTAG emulators has open drain output on nTRST and in this case pull-up is needed. I am not familiar with your JTAG emulator.).

Best regards,
Miro

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TMS570LS1227: Can we connect the nTRST to lauterbach debugger directly?