What is mean by memory interfacing ? Explain the address decoding process in 8085 microprocessor 8X3

What is mean by memory interfacing? Explain the address decoding process in 8085 microprocessor with 3 X 8 decoder.

Interfacing a microprocessor is to connect it with various peripherals to perform various operations to obtain a desired output.
Memory Interfacing and I/O Interfacing are the two main types of interfacing.
Memory 'Interfacing is used when the microprocessor needs to access memory frequently for reading and writing data stored in the memory. It is used when reading/writing to a specific register of a memory chip.

I/O Interfacing is achieved by connecting keyboard (input) and display monitors (output) with the microprocessor.

The method use by the system to select the correct location on the correct chip is called addressing decoding. In another way, it is the process of generating a chip select (CS) or enable signals from the address bus for each device in the system. The address bus lines are split into two sections:
1. The N, MSB are used to generate a chip select (CS) signal for different device.
2. The M, LSB are passed in the device as address to the different memory cells or internal registers.

ADDRESS BUS

N-bits to decoder(MSB) M-bits to memory (LSB) Address decoding can be done using 3 to 8 decoder.
1. Assume a microprocessor with 10 address lines that give total of mapping 1 KB memory.
2. Let us consider that we want to implement all its memory space and we use 128*8 memory chips.
3. Só we have 8 memory chips with 128 bytes storage, so we need 3 address lines connected with the decoder to generate 8 different chip select signals and select one of the 8 chips.
4. And 7 address lines to select a particular memory word of the selected chip.