C6713 Software interrupt without using DSP/BIOS

Hey Group,

I'm am trying to generate a software interrupt on INT4 on a 6713 
DSK. I have declared the interrupt in the vector assembly file and 
this is the configurations in the main():

/******************************************************************/
  CSL_init();
  IRQ_setVecs(vectors);
  IRQ_globalEnable();
  IRQ_nmiEnable();  

  IRQ_enable(IRQ_EVT_EXTINT4);
  ISR = 0x10;

  while(go){};

/*****************************************************************/

I can see that the bit IF4 in the IFR register is set but the 
interrupt does not happen. Am I forgetting something?

Regards,

Frank