MPC8308 localbus upm mode burst read 的问题

jojolin

各位好：
我们用localbus接FPGA接设备，由于GPCM模式的速度太慢，所以想试用UPM模式，ram字应该是设置进去了，因为我用FPGA的仿真器可以看到对我使用的这个片选执行了16次的读操作，正是我ram字设的burst read 时序，但是下面我不知道bursr read 之后我应该怎么读取出总线上的数据？直接访问片选吗？可是我执行一次burst read 出16个读信号，这时候数到什么地方去了呢？事实上我现在run upm 之后一次都读不出来东西，upm恢复为normal模式就可以，哪位高人帮我看下下面的程序 谢谢！！！！！

1. /* UPM Table Configuration Code */
   
2. static unsigned long UpmTable[] =
   
3. {
   
4. 0xfffffc00, 0x0ffcfc00, 0x0ffcfc00, 0x0ffcfc00, //Words 0 to 3
   
5. 0x0ffcfc00, 0x0ffcfc04, 0xfffffc00, 0xfffffc01, //Words 4 to 7
   
6. 0xfffffc00, 0x0ffcfc80, 0x0ffcfc00, 0x0ffcfc00, //Words 8 to 11
   
7. 0x0ffcfc00, 0x0ffcfc04, 0xfffffc00, 0xfffffc00, //Words 12 to 15
   
8. 0xfffffc00, 0x0ffcfc00, 0x0ffcfc00, 0x0ffcfc00, //Words 16 to 19
   
9. 0x0ffcfc00, 0x0ffcfc04, 0xfffffc80, 0xfffffc01, //Words 20 to 23
   
10. 0xfffffc00, 0x0faffc00, 0x0faffc00, 0x0faffc00, //Words 24 to 27
    
11. 0x0faffc00, 0x0faffc04, 0xfffffc00, 0xfffffc01, //Words 28 to 31
    
12. 0xfffffc00, 0x0faffc80, 0x0faffc00, 0x0faffc00, //Words 32 to 35
    
13. 0x0faffc00, 0x0faffc04, 0xfffffc00, 0xfffffc00, //Words 36 to 39
    
14. 0xfffffc00, 0x0faffc00, 0x0faffc00, 0x0faffc00, //Words 40 to 43
    
15. 0x0faffc00, 0x0faffc04, 0xfffffc80, 0xfffffc01, //Words 44 to 47
    
16. 0xfffffc00, 0xfffffc00, 0xfffffc00, 0xfffffc00, //Words 48 to 51
    
17. 0xfffffc00, 0xfffffc00, 0xfffffc00, 0xfffffc00, //Words 52 to 55
    
18. 0xfffffc00, 0xfffffc00, 0xfffffc00, 0xfffffc01, //Words 56 to 59
    
19. 0xfffffc00, 0xfffffc00, 0xfffffc00, 0xfffffc01 //Words 60 to 63
    
20. };
    
21. 
    
22. void main()
    
23. {
    
24. 
    
25. int i=0;
    
26. 
    
27. Ttest fpga;
    
28. unsigned long j=0,temp=0;
    
29. 
    
30. 
    
31. unsigned long mamr=0,mar=0;
    
32. 
    
33. 
    
34. printf("Welcome to CodeWarrior!\r\n");
    
35. 
    
36. 
    
37. system_call(); // generate a system call exception to demonstrate the ISR
    
38. 
    
39. //setup upm
    
40. *(volatile unsigned long *)0xe0005018 = 0xfa001881; //BR 0xfa201081
    
41. j = *(volatile unsigned long *)0xe0005018;
    
42. 
    
43. *(volatile unsigned long *)0xe000501C = 0xF0000000;; //OR 0xF0001000
    
44. 
    
45. j = *(volatile unsigned long *)0xe000501C;
    
46. 
    
47. 
    
48. 
    
49. /*
    
50. * program UPM-A table
    
51. */
    
52. 
    
53. /* setup MAMR for sequential write to UPM-A RAM */
    
54. *(volatile unsigned long *)0xe0005070 = 0x10000000;
    
55. 
    
56. /* write 64 words to UPM-A RAM */
    
57. for (i = 0; i < 64; i++) {
    
58. //写入 MDR
    
59. 
    
60. *(volatile unsigned long *)0xe0005070 = 0x10000000 | i;////gx
    
61. 
    
62. *(unsigned long*)(0xe0005088)=UpmTable[i];
    
63. 
    
64. 
    
65. if ( (*(unsigned long*)(0xe0005088)) != UpmTable[i])
    
66. {
    
67. return ;
    
68. }
    
69. 
    
70. //空写操作
    
71. *(unsigned char*)(0xfa000000)=0x12345678;
    
72. }
    
73. 
    
74. /* restore MAMR */
    
75. *(volatile unsigned long *)0xe0005070 = 0x00000000;
    
76. while(1)
    
77. {
    
78. j=*(volatile unsigned long *)0xe0005070 ;
    
79. if(j==0x0)
    
80. {
    
81. break;
    
82. }
    
83. }
    
84. 
    
85. 
    
86. while (1)
    
87. {
    
88. *(volatile unsigned long *)0xe0005070 = 0x30000008;//工作模式 mamr run  8代表 upm ram words burst read 区域
    
89. //空写操作
    
90. *(unsigned char*)(0xfa000000)=0x12345678;
    
91. 
    
92. mar = *(volatile unsigned long *)0xfa000080;//读不出来 ？？？？？？？？？？？？？？？？？？？？？？？？
    
93. 
    
94. *(volatile unsigned long *)0xe0005070=0;//恢复normal模式
    
95. 
    
96. mar = *(volatile unsigned long *)0xfa000080;//在这里就可以读出来
    
97. } // loop forever
    
98. }
    

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lzy538

你好，你的这个问题解决了吗，我目前也遇到相同的问题