DMA CONTROLLER
ARCHITECTURE OF 8085
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Detailed explanation-1: -We have three different modes of transfer: Programmed i/O, Interrupt-initiated I/O, and Direct Memory Access (DMA). Programmed i/O and Interrupt-initiated I/O are modes of transfer that involve the CPU for data transfer.
Detailed explanation-2: -There are three primary ways to transfer data across the PCI bus: Direct Memory Access (DMA), Interrupt Request (IRQ), and Programmed I/O.
Detailed explanation-3: -The three methods used by IO devices to read/write data are the character method, block method, and network method.
Detailed explanation-4: -An interface may receive four types of commands. They are control, status, data input and data output Control command: It is issued to activate the peripheral and to inform it what to do.
Detailed explanation-5: -Mode of Transfer: The binary information that is received from an external device is usually stored in the memory unit. The information that is transferred from the CPU to the external device is originated from the memory unit. CPU merely processes the information but the source and target is always the memory unit.