BIO303 MIDTERM PAST PAPER
Module 42 42. Information Manipulation: Direct Memory Access and Handshaking Since a regulator is joined to a PC’s transport, it can continue its own correspondence with principle memory during those nanoseconds where the CPU isn’t utilizing the transport.
This capacity of a regulator to get to fundamental memory is known as immediate memory access (DMA), and it is a huge resource for a PC’s presentation. For example, to recover information from an area of a plate, the CPU can send demands encoded as bit examples to the regulator appended to the circle requesting that the regulator read the area and spot the information in a predefined area of principle memory.
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The CPU can then go on with different undertakings while the regulator per-structures the read activity and stores the information in principle memory by means of DMA. BIO303 MIDTERM PAST PAPER
Subsequently, two exercises will be performed simultaneously. The CPU will execute a program and the regulator will manage the exchange of information between the circle and fundamental memory. Thusly, the figuring assets of the CPU are not squandered during the generally sluggish information move. BIO303 MIDTERM PAST PAPER
The utilization of DMA likewise has the impeding impact of confounding the correspondence occurring over a PC’s transport. Bit designs should move between the CPU and principle memory, between the CPU and every regulator, and between every regulator and primary memory.