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Harvard architecture. The Harvard architecture is a computer architecture with separate storage [1] and signal pathways for instructions and data. It is often contrasted with the von Neumann architecture, where program instructions and data share the same memory and pathways. This architecture is often used in real-time processing or low-power ...
By contrast, von Neumann and split-cache modified Harvard machines store both instructions and data in a single address space, so address "zero" refers to only one location and whether the binary pattern in that location is interpreted as an instruction or data is defined by how the program is written.
IO5 is a 5-bit I/O address covering the bit-addressable part of the I/O address space, i.e. the lower half (range: 0–31) IO6 is a 6-bit I/O address covering the full I/O address space (range: 0–63) D16 is a 16-bit data address covering 64 KiB; in parts with more than 64 KiB data space, the contents of the RAMPD segment register is prepended
The AVR is a modified Harvard architecture machine, where program and data are stored in separate physical memory systems that appear in different address spaces, but having the ability to read data items from program memory using special instructions.
In a Harvard architecture or modified Harvard architecture, a separate virtual address space or memory-access hardware may exist for instructions and data. This can lead to distinct TLBs for each access type, an instruction translation lookaside buffer (ITLB) and a data translation lookaside buffer (DTLB). Various benefits have been ...
Having separate address spaces for instruction and data memory is what (in my opinion) defines the Harvard architecture. Assuming that there is only one instruction memory address space (I can't think of a reason to have more than one), that still leaves the door open for more than one data address space.
Interactive maps, databases and real-time graphics from The Huffington Post
Like the counter machine, the RA-machine contains the execution instructions in the finite-state portion of the machine (the so-called Harvard architecture). The RA-machine's equivalent of the universal Turing machine – with its program in the registers as well as its data – is called the random-access stored-program machine or