January 1, 2021 Journal article Open Access

Andrea Merello; Mirco Di Salvo; Marco Crepaldi

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  <identifier identifierType="URL">https://www.openaccessrepository.it/record/142349</identifier>
  <creators>
    <creator>
      <creatorName>Andrea Merello</creatorName>
    </creator>
    <creator>
      <creatorName>Mirco Di Salvo</creatorName>
    </creator>
    <creator>
      <creatorName>Marco Crepaldi</creatorName>
    </creator>
  </creators>
  <titles>
    <title>A Multi-One Instruction Set Computer for Microcontroller Applications</title>
  </titles>
  <publisher>INFN Open Access Repository</publisher>
  <publicationYear>2021</publicationYear>
  <subjects>
    <subject>General Engineering</subject>
    <subject>General Materials Science</subject>
    <subject>General Computer Science</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2021-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://www.openaccessrepository.it/record/142349</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1109/access.2021.3104150</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://www.openaccessrepository.it/communities/itmirror</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">This work presents a simple integer-only instruction set architecture and microarchitecture derived from One Instruction Set Computers (OISCs) and embedding multiple execution modes ( ${m}$ OISC), capable of running at a reasonable performance level to enable basic usability in microcontroller applications. The purpose of  ${m}$ OISC is to enable simple data transfer tasks and run small programs while maintaining ultimate simplicity. We present the internal organization for a computer architecture including an 8bit I/O register, and 64kB central Random Access Memory (RAM), organized in two-bytes words. The processor can run code generated assuming an OISC or a Complex Instruction Set Computer (CISC) scheme (op-code based), depending on the programmer&amp;#x2019;s demands and based on the initial setting of a register during start-up. To enable practical applications and demonstrate successful exploitation of  ${m}$ OISC in view of integration in a compiler back-end, we designed a custom Proof-of-Concept (PoC) software design toolchain based on LLVM and clang. Although not targeting all the features of commercial ISA, the toolchain is capable of compiling C code from LLVM intermediate representation or generating  ${m}$ OISC code translated from ARM, x86, RISC-V, and MIPS assembly. The toolchain also enables practical Value Change Dump (VCD) simulations output with graphical plots of the CPU state and associated symbols. A PoC microcontroller system has been synthesized in a low power Field Programmable Gate Array (FPGA) and verified in a basic wireless telemetry application including a Synchronous Peripheral Interface (SPI) RFM9x Long RAnge (LoRA) transceiver and a MAX30205 Inter Integrated Circuit (I&lt;sup&gt;2&lt;/sup&gt;C) temperature sensor, using its 8bit I/O port, with software bus interface implementation.  ${m}$ OISC occupies &amp;#x007E;6&amp;#x0025; of resources on a Cyclone 10LP FPGA, for 1397 Adaptive Look-Up Tables (ALUTs) and 461 dedicated logic registers. The measured dynamic current consumption of the complete FPGA board with synthesized  ${m}$ OISC is 12mA at 100MHz clock.</description>
  </descriptions>
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