Direct Memory Access (DMA) transfers the block of data between the memory and peripheral devices of the system, without the participation of the processor. The unit that controls the activity of accessing memory directly is called a DMA controller. The processor relinquishes the system bus for a few clock cycles. So, the DMA controller can accomplish the task of data … [Read more...] about Direct Memory Access (DMA)
RISC Processor
RISC is an abbreviation of Reduced Instruction Set Computer. RISC processor has 'instruction sets' that are simple and have simple 'addressing modes'. A RISC style instruction engages "one word" in memory. Execution of the RISC instructions are faster and take one clock cycle per instruction. Although the forerunners of RISC computers were seen in 1960. But, due to the … [Read more...] about RISC Processor
Difference Between Hardwired and Microprogrammed Control Unit
The Hardwired and Microprogrammed control unit generates the control signals to fetch and execute instructions. The fundamental difference between hardwired and microprogrammed control unit is that hardwired is a circuitry approach whereas, the microprogram control unit is implemented by programming. The hardwired control unit is designed for the RISC style instruction set. … [Read more...] about Difference Between Hardwired and Microprogrammed Control Unit
CISC Processor
CISC is an abbreviation for Complex Instruction Set Computer. CISC processors were evolved in the 1970s before the evolution of RISC (Reduced Instruction Set Computers) processors. During this period the computer memory uses to be 'small' and 'very expensive'. CISC processors were helpful in simplifying the code and making it shorter in order to reduce the memory … [Read more...] about CISC Processor
Addressing Mode and its Types
Addressing modes specifies the way, the effective address of an operand is represented in the instruction. Some addressing mode efficiently allows referring to a large range of area like a linear array of addresses and list of addresses. Addressing mode describes a flexible and efficient way to define complex effective address. Generally, the programs are written in a … [Read more...] about Addressing Mode and its Types