TMS570LS0432: JTAG Interface

ReedKacz

Part Number: TMS570LS0432

Hi Team,

Could you please share the correct connections for JTAG 10 pin interface? Below is customer drawing and they are looking for feedback. Thanks! Reed

over 2 years ago

0 QJ Wang over 2 years ago

TI__Guru**** 192146 points

For 10-pin JTAG header, the pin 10 is for nRESET (system reset). Pin 10 can not be used for nTRST.

The 10-pin Arm JTAG connector doesn't include the nTRST signal. Without this signal, the TMS570 JTAG TAP controller will be held in reset by the internal and external pull-down that is recommended for the TMS570 TRSTn pin. This will make it impossible to communicate with TMS570LSx via JTAG.

0 ReedKacz over 2 years ago in reply to QJ Wang

TI__Intellectual 2852 points

Thank you very much, QJ. Could you share any reference schematic that the customer could use for reference?

0 QJ Wang over 2 years ago in reply to ReedKacz

TI__Guru**** 192146 points

Hi Reedkacz,

Please refer to my note about the JTAG connection:

https://software-dl.ti.com/hercules/hercules_docs/latest/hercules/FAQ/FAQ.html#jtag-connection

You can also refer to the launchpad schematics about the JTAG signals connections. The launchpad is small and the JTAG signal trace is very short, so we don't add series termination resistors on JTAG signals.

0 ReedKacz over 2 years ago in reply to QJ Wang

TI__Intellectual 2852 points

QJ - perfect thanks. The customer has updated and is shown below. Could you please take a look to make sure it is OK? Thanks!

0 QJ Wang over 2 years ago in reply to ReedKacz

TI__Guru**** 192146 points

Hi ReedKacz,

1. The RTCK is not a standard JTAG signal, so leaving it NC is OK.

2. If nTRST is not connected to emulator, the nTRST should be pulled HIGH on your target PCB board. If nTRST is connected to debugger or emulator which has an internal pull-up on nTRST signal, a pull-down is added to nTRST on target PCB board.

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TMS570LS0432: JTAG Interface