For how long would device tie up bus when transferring block

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Reference no: EM13262396

Consider a system in which a data transfer over a bus takes 500 ns. Transfer of bus control in either direction, from processor to I/O device or vice versa, takes 250 ns. One of the I/O devices has a data transfer rate of 50 KB/s and employs DMA. Data are transferred one byte at a time

a. Suppose we employ DMA in a burst mode. That is the DMA interface gains bus mastership prior to the start of a block transfer and maintains control of the bus until the whole block is transferred. For how long would the device tie up the bus when transferring a block of 128 bytes?

b. Repeat the calculation for cycle-stealing mode.

Reference no: EM13262396

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