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What does SPM stand for?

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What does SPM stand for?

(a) scratch pad memories

(b) sensor parity machine

(c) scratch pad machine

(d) sensor parity memories

The question was posed to me in a national level competition.

My question comes from Compilers topic in chapter Implementing Embedded System: Hardware/Software Codesign of Embedded Systems

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The correct answer is (a) scratch pad memories

To elaborate: The smaller memories provide faster access and consume less energy per access and SPM or scratch pad memories is a kind of small memory which access fastly and consume less energy per access and it can be exploited by the compiler.

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