Hi
I just created a design with a µBlaze and some LEDs for testing and a OPB Busmaster device created with the xps helper with "User Logic SW Register Support" and "User Logic Master Support". The device has one register mapped to the OPB. The base adress of the device is 0x7d600000. If i understand the description in the user_logic.vhdl from the obp_busmaster device correcly the following instructions of the µBlaze should trigger an bus transfer from the device to the LED port: #define XPAR_OPB_BUSMASTER 0x7d600000 int main (void) { int i,j; for(i=0;i