What are the maximum address space and I O spaces available in 8086 processor?
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What are the maximum address space and I O spaces available in 8086 processor?
64 KB
It provides a 16-bit I/O address bus, supporting 64 KB of separate I/O space. The maximum linear address space is limited to 64 KB, simply because internal address/index registers are only 16 bits wide.
What is the maximum addressing capacity of 8086?
Intel 8086 uses 20 address lines and 16 data- lines. It can directly address up to 220 = 1 Mbyte of memory. It consists of a powerful instruction set, which provides operation like division and multiplication very quickly. 8086 is designed to operate in two modes, i.e., Minimum and Maximum mode.
How many bits are required to address the IO memory space of 8086?
20-bit
The 8086 processor has a 20-bit address bus, which gives a physical address space of up to 1 MB (220), addressed as 00000h to FFFFFh.
How much memory space does the 8086 have?
The 8086 was designed to address as much as 1MB of memory. Normally, a 16-bit processor is limited to 64KB of RAM; while the 8086’s 20-bit bus made 1MB possible, it still needed a way to address it with a 16-bit processor.
What is the size of I O address space?
The I/O address space consists of 2^(16) (64K) individually addressable 8-bit ports; any two consecutive 8-bit ports can be treated as a 16-bit port; and four consecutive 8-bit ports can be treated as a 32-bit port.
How many number of I O Ports in 8086 can address?
8086 has a 20 bit address bus can access upto 220 memory locations ( 1 MB) . It can support upto 64K I/O ports. It provides 14, 16-bit registers.
What is minimum and maximum mode in 8086?
The 8086 microprocessor can work in two modes of operations : Minimum mode and Maximum mode. In the minimum mode of operation the microprocessor do not associate with any co-processors and can not be used for multiprocessor systems. In the maximum mode the 8086 can work in multi-processor or co-processor configuration.
What are the 16-bit families of Intel?
Intel 8086/Intel 8088.
How does CPU identify between 8bit and 16bit operations?
The bit size (8-bit, 16-bit, 32-bit) of a microprocecessor is determined by the hardware, specifically the width of the data bus. The Intel 8086 is a 16-bit processor because it can move 16 bits at a time over the data bus. The Intel 8088 is an 8-bit processor even though it has an identical instruction set.
How many address lines are there in 8086 microprocessor?
20-line
The 8086 uses 20-line address bus. It has a 16-line data bus. The 20 lines of the address bus operate in multiplexed mode.
How many 16-bit I O ports can the microprocessor support?
Thus, the I/O address space can accommodate up to 64K 8-bit ports, up to 32K 16-bit ports, or up to 16K 32-bit ports. The program can specify the address of the port in two ways. Using an immediate byte constant, the program can specify: 256 8-bit ports numbered 0 through 255.
What is the address bus size of 8086 microprocessor?
The Intel 8086 had a 16-bit I/O address bus and a 20-bit memory address bus, allowing for 64KiB of I/O space and 1 MiB of memory. These busses shared the same pins in order to fit in a 40-pin DIP package, so only one operation could be performed at a time.
What is the difference between 8085 and 8086 microprocessors?
Address Bus − 8085 has 16-bit address bus while 8086 has 20-bit address bus. Memory − 8085 can access up to 64Kb, whereas 8086 can access up to 1 Mb of memory.
What is maximum mode and minimum mode in 8086 microprocessor?
Maximum mode is suitable for system having multiple processors and Minimum mode is suitable for system having a single processor. The most prominent features of a 8086 microprocessor are as follows − It has an instruction queue, which is capable of storing six instruction bytes from the memory resulting in faster processing.
What is a 20 bit address in a CPU?
In order for an address of 20 bits in width to be composed in code, the CPU automatically combines the contents of two registers for all memory access (but not IO accesses, which are limited to 16 bit addressing). The two registers that combine to make up the 20 bit address are called generically segment registers and offset registers.