![]() As mentioned before, the BIU generates a 20-bit physical address after shifting the contents of the desired segment register four bits to the left and then adding the 16-bit EA to it. Note that EA is displacement of the desired location from the segment base. This offset is also called the Effective Address (EA). For example, when the EU needs to access a memory location, it sends an offset value to the BIU. ![]() It must use the BIU segment registers to access memory. However, the EU cannot directly access the memory operands. 8086 Addressing Modes for Accessing Data In Memory (Memory Modes):Īs mentioned before, the Execution Unit (EU) has direct access to all registers and data for register and immediate operands. In an immediate mode, 8 or 16-bit data can be specified as a part of instruction. This mode specifies the source operand, destination operand, or both to be contained in an 8086 register. ![]()
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