Memory Mapped Input/output



MEMORY MAPPED I/O


–> has 16 bit device address
–> MEMR(bar)/MEMW(bar) are control signals for input and output.
–> all memory related instruction like STA, LDA, LDAX etc are available.
–> Data transfer occurs between any register and I/O.
–> the memory map of 64K is shared between I/O and system memory.
–> general execution speed of 13 and 7 t states.
–> more hardware is required to decode 16 bit address.
–> arithmetic and logical operation can be directly performed with I/O data.

MEMORY MAPPED INPUT/OUTPUT


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