Forum Discussion
Altera_Forum
Honored Contributor
17 years agoMy recommendations:
1. Check the TDO output with the scope as well. It should be high-z in all TAP controller states except shift DR and shif IR. So you can see if you managed to move the TAP controller to the appropriate state. 2. There should be a TAP controller reset at the very beginning of your sequence PTD_PTD0 = 1; //TMS=1 for (j=0;j<5;j++)clock_Cycle(); // test logic reset PTD_PTD0 = 0; //TMS=0 clock_Cycle(); // test idle PTD_PTD0 = 1; //TMS=1 ... Hope that helps, Harald