Method and apparatus for terminating direct memory access transfers from system memory to a video device

摘要

An embodiment of a method for terminating direct memory access transfers from system memory to a video device includes completing a current byte transfer from a graphics controller to a video device and then refraining from initiating any further write cycles associated with a DMA transfer to the video device. The graphics controller then allows uninterrupted or atomic read and write cycles to the video device. The graphics controller also completes any current read cycles on a system bus that had previously been initiated. The graphics controller then resets its DMA engine and invalidates all information in a first-in, first-out (FIFO) storage buffer.