Komputer tersusun atas beberapa komponen penting seperti CPU, memori, perangkat I/. Direct reminiscence entry (DMA) adalah suatu alat pengendali khusus disediakan untuk memungkinkan transfes blok information langsung antar perangkat eksternal dan memori utama, tanpa intervensi terus menerus dari prosesor. The chip assist best site four DMA channels, i.e. four peripheral gadgets can independently request for DMA knowledge transfer by these channels at a time.
Before we take a look at Packet Primarily based and Frequent Buffer based mostly transfers, we need to perceive the concept of Map Registers in association with DMA.
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Terminal depend output indicates to the at the moment selected peripherals that the current DMA cycle is the final for the previously programmed knowledge block.
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The channel 2 registers are used as standard, while the channel three registers are used to store the block reinitialisation parameters, i.e. the DMA starting handle and terminal count.
Dengan DMA, CPU cukup memulai prosesnya dan bisa melakukan kerja lain selama proses switch itu berlangsung dan tinggal menunggu informasi dari DMA controller jika proses transfer sudah selesai.
The machine that desires to switch information over a DMA channel, will entry the block of the memory with the starting address saved within the DMA Address Register.