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TMS570LS0914: Unable to access the DAP

Part Number: TMS570LS0914

Good morning sirs, 

I have a board that has been locked with following message. As it happened in linked thread.

Error connecting to the target: (Error -1170 @ 0x0) Unable to access the DAP. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 9.6.0.00172)

Following the proposed steps I could reach to connect the IcePickC and the DAP and even see the registers linked but I couldn't by anyway connect to the ARM. 

Can anyone help how to do it?

TMS570LS3137: Unable to access the DAP - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Thanks for your help