DSP6713 CE1#不拉低

在家，我用的是DSP6713，在CE1空间接了一个Flash：AM29LV160D，但不知道为什么不论擦除，还是读写，CE1#片选信号都不拉低，请问哪些原因会导致这个问题?

下面是我的程序：

主程序：

1. Flash_StartAdd = 0x90000000;
   
2. 
   
3. flash_chip_erase();
   
4. printf("Finish flash erase！\n");// Write flash memory.
   
5. for(i=0;i<0x400;i++)
   
6. {
   
7. data = i;//fmod(i,0x10000);
   
8. addr = (Flash_StartAdd+2*i);
   
9. Write_Flash_Word(&data,&addr);
   
10. }
    
11. printf("Write flash ok.\n");// Read flash memory.
    
12. for(i=0;i<0x400;i++)
    
13. {
    
14. addr = Flash_StartAdd+2*i;
    
15. Read_Flash_Word(&data,&addr);
    
16. if(data ！= fmod(i,0x10000))
    
17. {
    
18. printf(" Testing is Failure！\n");
    
19. printf("Address 0x%x is error！ Data is 0x%x\n",i,data);
    
20. exit(0);
    
21. }
    
22. }
    
23. printf("Opereation is success.\n");
    
24. #define FLASH_ADR1 (0x90000000+0x555<<1)
    
25. #define FLASH_ADR2 (0x90000000+0x2AA<<1)
    
26. #define Sourceaddr 0x90000000
    
27. #define Toggle_Bit 0x80 //0x40 /* d6 = 1 */
    
28. #define Hangup_Bit 0x20 /* d5 = 1 */
    
29. #define Pass_Flag 0
    
30. #define Fail_Flag 1
    
31. void flash_chip_erase()
    
32. {
    
33. *(volatile Uint16*)FLASH_ADR1=0x012a;//0xaa;
    
34. *(volatile Uint16*)FLASH_ADR2=0x0095;//0x55;
    
35. *(volatile Uint16*)FLASH_ADR1=0x0100;//0x80;
    
36. *(volatile Uint16*)FLASH_ADR1=0x012a;//0xaa;
    
37. *(volatile Uint16*)FLASH_ADR2=0x0095;//0x55;
    
38. *(volatile Uint16*)FLASH_ADR1=0x0010;//0x10;
    
39. }
    
40. int Toggle_Bit_Check(Uint16 *addr)
    
41. {
    
42. Uint16 toggle_data,read_data;
    
43. toggle_data = *addr&Toggle_Bit;
    
44. do{
    
45. if(((read_data = *addr) &Toggle_Bit) == toggle_data)
    
46. break;
    
47. toggle_data = read_data & Toggle_Bit;
    
48. }while((read_data&Hangup_Bit) ！= Hangup_Bit);
    
49. toggle_data = *addr & Toggle_Bit;
    
50. if(((read_data = *addr)&Toggle_Bit) ！= toggle_data)
    
51. return (Fail_Flag);
    
52. return (Pass_Flag);
    
53. }
    
54. 
    
55. int Write_Flash_Word(Uint16 *data,Uint16 *address)
    
56. {
    
57. *(volatile Uint16 *)FLASH_ADR1=0x012a;//0xaa;
    
58. *(volatile Uint16 *)FLASH_ADR2=0x0095;//0x55;
    
59. *(volatile Uint16 *)FLASH_ADR1=0x0120;//0xa0;
    
60. *address=*data;
    
61. return(Toggle_Bit_Check(address));
    
62. }
    
63. int Read_Flash_Word(Uint16 *data,Uint16 *address)
    
64. {
    
65. *(volatile Uint16 *)FLASH_ADR1=0x012a;//0xaa;
    
66. *(volatile Uint16 *)FLASH_ADR2=0x0095;//0x55;
    
67. *(volatile Uint16 *)FLASH_ADR1=0x01b0;//0xf0;
    
68. *data=*address;
    
69. return(Toggle_Bit_Check(address));
    
70. }

这个是因为地址计算错误，没有写到0x90000000CE1空间去……