When BG (bus grant) input is 0, the CPU can communicate with DMA registers. Through the use of the address bus and allowing the DMA and RS register to select inputs, the register within the DMA is chosen by the CPU. The unit communicates with the CPU through the data bus and control lines. The figure below shows the block diagram of the DMA controller. Therefore, the CPU can both read and write into the DMA registers under program control via the data bus. Note: All registers in the DMA appear to the CPU as I/O interface registers. Control register – It specifies the transfer mode.Word count register – It contains the number of words to be transferred.Address register – It contains the address to specify the desired location in memory.The DMA controller registers have three registers as follows. Interleaved DMA: Interleaved DMA are those DMA that read from one memory address and write from another memory address. Software Engineering Interview Questions.Top 10 System Design Interview Questions and Answers.Top 20 Puzzles Commonly Asked During SDE Interviews.Commonly Asked Data Structure Interview Questions.Top 10 algorithms in Interview Questions.Top 20 Dynamic Programming Interview Questions. Top 20 Hashing Technique based Interview Questions.Top 50 Dynamic Programming (DP) Problems.Top 20 Greedy Algorithms Interview Questions.Top 100 DSA Interview Questions Topic-wise.
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