As the title says, someone please clarify the differences between ARM7 and ARM7E.
I presume you are referring to the ARMv7-M ARM
The DSP optional extension adds the ARM Digital Signal Processing (DSP) instructions to the ARMv7-M Thumb instruction set. These instructions include saturating and unsigned Single Instruction Multiple Data (SIMD) instructions. An ARMv7-M implementation that includes the DSP extension is called an ARMv7E-M implementation.
Please refer to the ARMv7-M ARM here:
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