memory interfacing in 8085 microprocessor pdf

Department of ECE, Vardhaman College of Engineering, Shamshabad, Hyderabad Ģ Memory Map Table Address A19 A18 A17 A16 A15 A14 A13 A12 A11 A10 A09 A08 A07 A06 A05 A04 A03 A02 A01 A00 FFFFFH EPROM 8K X 8 FE000H FDFFFH RAM 8K X 8 FC000H Total 8K bytes of EPROM need 13 address lines A0-A12 (since z13 = 8K). The address of RAM may be selected anywhere in the 1MB address space of 8086, but we will select the RAM address such that the address map of the system is continuous. Hence, this address must lie in the EPROM. Solution: We know that, after reset, the IP and CS are initialized to form address FFFF0H. Relation between number of address pins and memory capacity Problem 1 Interface two 4Kx8 EPROM and two 4Kx8 RAM chips with Select suitable maps. The of memory is derived from the O/P of the decoding circuit.

Connect 16-bit data bus of the memory bank with that of the microprocessor The remaining address lines of the microprocessor, and A 0 are used for decoding the required chip select signals for the odd and even memory banks. Connect available memory address lines of memory chips with those of the microprocessor and also connect the memory and inputs to the corresponding processor control signals. The upper 8-bit bank is called 'odd address memory bank' and the lower 8-bit bank is called 'even address memory bank'. Arrange the available memory chips so as to obtain 16-bit data bus width.

The general procedure of static memory interfacing with 8086 is briefly described as follows: 1. For example, 4Kx8 or 4K byte memory contains 4096 locations, where each location contains 8-bit data and only one of the 4096 locations can be selected at a time. The semiconductor memories are organized as two dimensional arrays of memory locations. The semiconductor RAMs are of broadly two types-static RAM and dynamic RAM. RAM (Random Access Memory) and ROM (Read Only Memory). 1 SEMICONDUCTOR MEMORY INTERFACING UNIT - III MEMORY AND IO INTERFACING Semiconductor memories are of two types, viz.

Memory interfacing in 8085 microprocessor pdf