Difference Between Harvard Architecture And Von Neumann Architecture


Von Neumann and Harvard architecture both are computer architectures. They describes a design architecture for an electronic digital computer .

Harvard Architecture Von Neumann Architecture
Harvard architecture has physically separate pathways for instructions and data. Von Neumann architecture uses same physical pathways for instructions and data .
It has one dedicated set of address and data bus for reading data from and writing data to memory, and another set of address and data buses for fetching instructions. It has same set of data and address buses for memory read/write and fetching instructions.
Under harvard architecture the CPU can both read an instruction and perform a data memory access at the same time . Under pure von Neumann architecture the CPU can be either reading an instruction or reading/writing data from/to the memory. Both cannot occur at the same time since the instructions and data use the same bus system.
Harvard architecture machine has distinct code and data address spaces: instruction address zero is not the same as data address zero. Von Neumann architecture has same data address and instruction address .

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