CCS/TMS570LS3137: Question about tms570.jlinkscript

Part Number: TMS570LS3137

Tool/software: Code Composer Studio

Hi,

I'm using jlink emulator,in the tms570.jlinscript file,there is a line of code in the function InitTarget:JTAG_Write(0x1F, 0, 6);What is the purpose of this operation?Send six bit0 to TDI?What does 0x1F mean?

void InitTarget(void) {
  Report("J-Link script: InitTarget()");
  //
  // Reset debug logic in order to make sure that ONLY the ICEPick is in the JTAG chain
  //
  JTAG_TRSTPin = 0;
  SYS_Sleep(50);
  JTAG_TRSTPin = 1;
  SYS_Sleep(50);
  JTAG_Write(0x1F, 0, 6);
  _InitIcePick();
}