ADSP-21489 ，using  the Asynchronous Memory problem?

hello,everyone

       the ADSP489      DATA 0-7     connect    DATA0-7        

      the ADSP21489   A 0-11         connect   A0-11  

      the ADSP21489    RD，WR    connect   RD，WR

                                  MSO         connect   CS

         In my project, the adsp-21489 connect a profibus chip,using as a asynchronous memory .

         now ,the signal of cs,rd,wr,and the addr is ok,but the signal of data has some problem.when i send the oxff to the data ,all the signal of data is like this ;

    my code:

      .....

    {

     *pSYSCTL |=  EPDATA32;

    *pEPCTL |=B0SD; // Mapping Bank 0 to non SDRAM

    *pEPCTL &= ~(B1SD|B2SD|B3SD);

    *pAMICTL0 = ( AMIEN | PKDIS  | BW8 | WS31 | HC2 | PREDIS );

     for(;;)

    {

      IINCHIP_WRITE(0x55,0xff);

  }

....

void IINCHIP_WRITE(unsigned int address,unsigned char data)

{

//    Delay(200);

    p_data=0x0070ffff+address;//0x4000000

    *(p_data) = data;

//    Delay(200);

}

please give me some advice!

thanks

                                                                 jett