Title page for etd-0728114-114613


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URN etd-0728114-114613
Author Yun-Chung Yang
Author's Email Address No Public.
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Department Computer Science and Engineering
Year 2013
Semester 2
Degree Master
Type of Document
Language English
Title A Reconfigurable Cache for Efficient Usage of the Tag RAM Space
Date of Defense 2014-07-18
Page Count 52
Keyword
  • Memory architecture
  • Cache
  • Abstract In almost every typical SoCs (System-on-Chip) in modern days, the size of cache grows larger
    as new SoC fabrics enhanced to satisfy the variety of workloads. Cache occupies the whole
    chip area more than 60% in SoC. Most of the time, application does not use the entire cache
    space. Consequently, the underutilized cache space consume a certain power constantly without
    any contribution. Thus, some of the industry company in present day, starting to develop
    mechanisms to make the cache size reconfigurable. In recent work, an idea of scratchpad memory
    extends the turned-off part of cache space as local memory, also called SPM (scratchpad
    memory), which can benefit other activities to further increase the performance or enhance instruction
    delivery. However, SPM only uses the part of data RAMs, the tag RAMs part is still
    remaining un-used. In this work, we proposed an architecture that can exploit the SPM space
    by reusing tag RAMs in either instruction or data cache. Implementing the proposed architecture
    on an ARM compatible CPU data cache for case study. The experiment results show that
    we can reclaim 12.5% of memory space with 0.08% hardware overhead in the configuration of
    4KB, 4 way-associative cache with 32 byte line size which is equivalent to ARM Cortex-A5.
    Advisory Committee
  • Kuen-Jong Lee - chair
  • Qi-Feng Wu - co-chair
  • stevewhaga - co-chair
  • Fu-Ching Yang - co-chair
  • Ren-Song Tsay - co-chair
  • Ing-Jer Huang - advisor
  • Files
  • etd-0728114-114613.pdf
  • Indicate in-campus at 2 year and off-campus access at 3 year.
    Date of Submission 2014-08-28

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