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Dear c6x: I have a question about XBUS of 6202. I use XBUS as asynchronous I/O. From the peripherals refrerence Guide I know i must use DMA to access the XBUS. But I can not access it. When i set the DMA destenation address as 0x80000000, it work well. But when i change the destenation address to 0x50000000(the XCE1 space begin adrress), it do not work. I have check the DAM regester. the DMA stat bit is 01, and the DMA start bit also is 01. This says that the DMA is running or waiting something. I also check the XBUS global control register, the bit 11 is 1,that says that the internal arbiter is enable. and the DSP own the BUS. By the way, i left the XHOLD pin and XHLODA pin float. I think if i use the internal arbiter mode, the two pin is unimportant. Best Regards Jun.Zhou 2003-03-28 |
about XBUS
Started by ●March 28, 2003
