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Applies to: ARMv7 Architecture
The term "ARM7" refers to a family of processor cores with a three-stage pipeline and a von Neumann memory interface. These cores are relatively old now but nevertheless still widely used. See http://www.arm.com/products/CPUs/families/ARM7Family.html for more information.
The term "ARMv7" refers to the Instruction Set Architecture (ISA) version 7. Variants of this ISA are to be found in the more recent Cortex family of cores. The ARM7 family or cores are ISA v4T; essentially, cores running later ISAs are backwardly compatible with earlier versions, so code written for an ARM7TDMI (ARM7 family - v4T ISA) will run on a Cortex core, but not necessarily the other way round.
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