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.
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Memory mapped buses helps in the extension of the address of the physical ram through which the devices can access the address
what is register
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.
Memory mapping is the technique of assigning specific memory locations to specific capabilities. For example, the stack can be "mapped" or placed in memory (usually towards the high end of memory). The "heap" is often placed just below the stack. Not only are software constructs placed (mapped) into specific locations in memory, but peripherals can be mapped to memory as well. For example, a serial port may have several registers "mapped" into memory at specific locations. The means that if you want to send a message out the serial port, you would perform the same operation as you would writing to memory, except that you would provide the address of the write register of the serial port. In this way, peripherals appear exactly the same as memory. The technique replaces the older "port" access in which peripherals were accessed via a different set of signals. (basically a different address space which was access via the "port" command rather than the memory read/write).
difference between register and memory location
Graphic images where each pixel is bit-mapped and take up more memory?
disadvantages of interrupt
register is the inbuilt memory associated with the computer,it is used to store the data .mostly Read Only Memory (ROM)uses most of the register memory
Registers are normally memory spaces internal to the processor or very close to it. They are generally faster than main memory and will be small in size and will hold very frequently used data.Register stacks are a set of such register memory locations.Memory refers to computers main memory outside CPU. It is used to keep data and programs. Memory stack is a series of memory locations.The difference between register stack and memory stack is...