Memory mapped buses helps in the extension of the address of the physical ram through which the devices can access the address
In memory mapped I/O, a chunk of the CPU's address space is reserved for accessing I/O devices. In I/O mapped I/O, I/O devices are handled distinctly by the CPU and hence occupy a separate chunk of addresses predetermined by the CPU for I/O. In case of Memory mapped I/O the same address BUS is used for accessing both Memory (RAM) and the Registers of I/O devices. For I/O Mapped I/O, separate address BUS is used. As Address space is generally larger for Memory than I/O registers, the length of I/O address is larger in case of Memory Mapped I/O. For a system which uses I/O Mapped I/O, there is a requirement for a extra h/w Circuitry.
A memory mapped register is a register that has its specific address stored in a known memory location.
Memory mapped IO is one where the processor and the IO device share the same memory location(memory) while IO mapped IO is one where the processor and the IO device have different memory located to each other.
Yes, the 8085 microprocessor can access memory location A000, as it has a 16-bit address bus that allows it to address up to 64KB of memory, ranging from 0000 to FFFF in hexadecimal. The address A000 falls within this range, meaning the 8085 can read from or write to this memory location. However, the actual access depends on the system's memory configuration and whether that specific address is mapped to valid RAM or ROM.
A 20-bit address bus can address 2^20 distinct memory locations, which equals 1,048,576 (or 1 megabyte) of memory. This allows the system to access a sufficient amount of RAM and memory-mapped I/O devices. The choice of a 20-bit address bus is often a design decision to balance performance and cost, enabling support for a wide range of applications without requiring larger, more expensive memory configurations.
In the 8085 microprocessor, memory-mapped I/O uses the same address space for both memory and I/O devices, allowing up to 64 KB of I/O addresses. In contrast, I/O mapped I/O (also known as port-mapped I/O) utilizes a separate address space for I/O operations, which allows for a limited number of I/O devices to be addressed (up to 256 8-bit ports). The instructions for accessing memory-mapped I/O involve standard memory instructions (like MOV), whereas I/O mapped I/O requires specific instructions like IN and OUT. This distinction affects how devices are interfaced and programmed.
Graphic images where each pixel is bit-mapped and take up more memory?
The usage of "segment" and "data bus" in the question appears inconsistent, and does not completely make sense. If you mean the data segment in the 8086/8088, then this is the region of memory mapped by the Data Segment (DS) register, usually reserved for operands in memory. If you are talking about the 8085, then the question does not make sense at all.
disadvantages of interrupt
The bus between the CPU and memory on the motherboard. Also called the memory bus, front-side bus, local bus, or host bus.
The purpose of the direct mapped cache tag in a computer system's memory management is to quickly determine if a requested memory address is stored in the cache memory. This helps improve the system's performance by reducing the time it takes to access data from the main memory.
The bus between the CPU and memory on the motherboard. Also called the memory bus, front-side bus, local bus, or host bus.