FLASH API REFERENCE UNDERSTANDING

Hi

I have already posted a question regarding flash api.

Unfortunately I am not able to get the appreciable answer.

I need few help regarding the api.

I have attached the reference code provided

  UINT32 k;
      /* enable CLEAN macro (if applicable) */
      ENA_CLEAN;
      /* retrieve MAC2 value and enable the appropriate core */
      k=cntl[MAC2];CLEAN(k);cntl[MAC2]=(k&~0x7)|core;
      /* disable level 1 sector protection */
      k=cntl[MAC1];CLEAN(k);cntl[MAC1]=(k|0x8000);
      /* 0x2fc0 = TCR=0 */
      cntl[TCR]=0x2fc0;
      /* start VNV steps at 0, Max programming pulses */
      cntl[MAXPP]=0x0000+MAX_PROG_PLS;
      /* 16 pulses per VNV step, Max compaction pulses */
      cntl[MAXCP]=0xf000+MAX_CMPCT_PLS;
      /* retrieve MAXEP */
      k=cntl[MAXEP];CLEAN(k);
      /* disable CLEAN macro (if applicable) */
      DIS_CLEAN;
      /* Check for Baseline 4 material */
      if ((k&0xf000)==0xf000) {
      /* VHV = 9.0v during erase */
      cntl[PTR3]=0x9964;
      /* Max VNV step = 0xf */
      cntl[MAXEP]=(0xf000+MAX_ERASE_PLS);
      } else { /* Baseline > 4 */
      /* VHV = 9.0v during erase */
      cntl[PTR3]=0x9b64;
      /* Max VNV step = 0xa */
      cntl[MAXEP]=(0xa000+MAX_ERASE_PLS);
      }
      /* Set Vread to 5.0v */
      cntl[PTR4]=0xa000;
      /* Program setup = 500nS, Erase setup = 8uS */
      cntl[PESETUP]=((delay<<8)|(delay<<4));
      /* ProgVer access = 1us, ErsVer access = 1us */
      k=(delay<<8|delay)<<1;
      cntl[PVEVACCESS]=k;
      /* Program hold = 1us, Compaction hold = 1us */
      cntl[PCHOLD]=k;
      /* PrgVer hold = 1us, ErsVer hold = 1us */
      cntl[PVEVHOLD]=k;
      /* PrgVer setup = 1us, ErsVer setup = 1us */
      cntl[PVEVSETUP]=k;
      /* CmpctVer access = 8us */
      cntl[CVACCESS]=(delay<<4);
      /* Compaction setup = 10us */
      k=(delay*20);
      cntl[CSETUP]=(0x3000|k);
      /* Erase hold = 40us */
      cntl[EHOLD]=(k<<2);
      /* Program pulse width */
      cntl[PWIDTH]=(delay*PROG_PLS_WIDTH);
      /* Compaction pulse width */
      cntl[CWIDTH]=(delay*CMPCT_PLS_WIDTH);
      /* Erase pulse width */
      cntl[EWIDTH]=(delay*ERASE_PLS_WIDTH);

Kindly let me know does the flash really needs 9 volts pump charger for erasing the flash!
On what basics that is calculated. I am not able to find calculation and what could be done
My board is getting reset exactly after the commands are executed

init_state_machine_D(core,delay,cntl);
 /* clear status register */
          *(volatile UINT16 *)start=0x40;
      /* Validate Sector command */
          *(volatile UINT16 *)start=0x1000;
      /* Dummy data value */
          *(volatile UINT16 *)start=0xffff;
      /* track compaction pulses */
Not sure what is causing the issue
Kindly request you to help out with appreciable answer!

Thank you
Deepak R