CCS/TMS320F28377D: The dsp chip uses an external ram. When writing data to an address, why does the data at other addresses change?

//###########################################################################
// FILE:   emif1_16bit_asram.c
// TITLE:  EMIF1 module accessing 16bit ASRAM.
//
//! \addtogroup cpu01_example_list
//! <h1> EMIF ASYNC module (emif1_16bit_asram)</h1>
//!
//! This example configures EMIF1 in 16bit ASYNC mode
//! This example uses CS2 as chip enable.
//!
//! \b Watch \b Variables: \n
//! - \b TEST_STATUS - Equivalent to \b TEST_PASS if test finished correctly,
//!                    else the value is set to \b TEST_FAIL
//! - \b ErrCount - Error counter
//!
//
//
//###########################################################################
// $TI Release: F2837xS Support Library v180 $
// $Release Date: Fri Nov  6 16:27:58 CST 2015 $
// $Copyright: Copyright (C) 2014-2015 Texas Instruments Incorporated -
//             http://www.ti.com/ ALL RIGHTS RESERVED $
//###########################################################################

#include "F28x_Project.h"     // Device Headerfile and Examples Include File

#define TEST_PASS 0xABCDABCD
#define TEST_FAIL 0xDEADDEAD

Uint16   *ExRamStart = (Uint16*)0x300000;
Uint16   *Start = (Uint16*)0x30ffff;
extern void setup_emif1_pinmux_async_16bit(Uint16);

//##########EMIF1-32bit ASRAM test ######################

#define EMIF1 0
#define EMIF2 1

#define MEM_D_WIDTH   1    // 16Bit Memory Interface
#define TURN_AROUND_TIME  0   // Turn Around time of 2 Emif Clock
#define RD_SETUP_TIME   0   // Read Setup time of 1 Emif Clock
#define RD_STROBE_TIME   3   // Read Strobe time of 4 Emif Clock
#define RD_HOLD_TIME   0   // Read Hold time of 1 Emif Clock
#define WR_SETUP_TIME   0   // Write Hold time of 1 Emif Clock
#define WR_STROBE_TIME   0   // Write Setup time of 1 Emif Clock
#define WR_HOLD_TIME   0   // Write Hold time of 1 Emif Clock
#define EXTEND_WAIT   0   // Disable Extended Wait
#define STROBE_SEL    0   // Disable Strobe Mode.
#define WAIT_POLAR_INV   0
#define WAIT_COUNT    0

Uint16  ErrCount = 0;
Uint32  TEST_STATUS;
int i;

void main(void)
{
   // char ErrCount_local;
 //TEST_STATUS = TEST_FAIL;

 InitSysCtrl();

  DINT;
  
//  Initialize the PIE control registers to their default state.
//  The default state is all PIE interrupts disabled and flags
//  are cleared.
//  This function is found in the F2837xS_PieCtrl.c file.
    InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
    EALLOW;  
 IER = 0x0000;
 IFR = 0x0000;
 EDIS;
 
// Initialize the PIE vector table with pointers to the shell Interrupt
// GService Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in F2837xS_DefaultIsr.c.
// This function is found in F2837xS_PieVect.c.
   InitPieVectTable();

//Configure to run EMIF1 on full Rate (EMIF1CLK = CPU1SYSCLK)
  EALLOW;
  ClkCfgRegs.PERCLKDIVSEL.bit.EMIF1CLKDIV = 0x0;
  EDIS;

  EALLOW; 

//Disable Access Protection (CPU_FETCH/CPU_WR/DMA_WR)
  Emif1ConfigRegs.EMIF1ACCPROT0.all = 0x0;
  if (Emif1ConfigRegs.EMIF1ACCPROT0.all != 0x0)
  {
      ErrCount++;
  }

// Commit the configuration related to protection. Till this bit remains set
// content of EMIF1ACCPROT0 register can't be changed.
  Emif1ConfigRegs.EMIF1COMMIT.all = 0x1;
  if(Emif1ConfigRegs.EMIF1COMMIT.all != 0x1)
  {
  ErrCount++;
  }

// Lock the configuration so that EMIF1COMMIT register can't be changed any more.
  Emif1ConfigRegs.EMIF1LOCK.all = 0x1;
  if (Emif1ConfigRegs.EMIF1LOCK.all != 1)
  {
   ErrCount++;
  }

  EDIS;

//Configure GPIO pins for EMIF1
  setup_emif1_pinmux_async_16bit(0);

  //////////////////////////////////////////////
  Uint32 i=0;

 for(i = 0; i< 0xFFFF; i++)
 {
  *(ExRamStart + i) = i;
 }
 asm(" ESTOP0");
 for(i=0;i<0xffff;i++){
  *(Start + i) = 0xaaaa;
 }
 asm(" ESTOP0");
//  asm(" ESTOP0");
  while (1);
}