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TMS570LS3137: ETRACE Pin Size With J-TRACE

user6220345
Intellectual 440 points
Part Number: TMS570LS3137
Other Parts Discussed in Thread: SEGGER,

Hello Sir,

I have a question about tracer pin numbers on TMS570LS3137 there are  approximatily 35 pin on ETM module. With that respect Segger J-Trace only uses for 4  ETRACEDATA. 

1. Why there are so many ETRACEDATA on TMS570LS.

2. How many pin required to get true trace on TMS570LS.

Thanks

  • 0
    TI__Guru**** 197306 points

    Hello,

    The maximum width of ETM data port on TMS570 device is 32-bit. XDS560V2 Pro tracer can support up to port width of 32-bit, the port size is configurable. You can use 4-bit, 8-bit, 12-bit, ... 32-bit. 

    Segger J-trace debugger only supports port width of 1,2,4-bit. The default value is 4-bit.

  • 0 in reply to QJ Wang
    Intellectual 440 points

    Sir what is the differences between these port sizes. If we use segger j-trace is there any technical problem with tracing.

    thanks.

  • 0 in reply to user6220345
    TI__Guru**** 197306 points

    Hello, 

    One of the greatest features of ETM trace is that it is non-intrusive, which means that tracing the instructions in the core doesn't affect the code execution. The port size doesn't impact the code execution. The debugger supporting bigger port size has better trace performance. There is no technical problem to use 4 out of 32 ETM data buses to trace the data.