Group Description

Using minicomputers as a starting point, logical addresses from the early to late 70’s grew from 16 to 32
bits. The main driver was main memory dram technology increases. In the early 90’s, the logical
address space increased to 64 bits. Again, the main driver was the main memory dram technology
increases. Today, in addition to increases in main memory technologies, the creation of cluster and
node multicomputer systems has resulted in a step function in memory capacities. This coupled with
newer contemporary memory reference models such as PGAS and WEB based referencing models, as
well as the introduction of non-volatile memory, results is the need to define SEMANTICS for data
references. This contrasts with previous logical address expansion that extended the address space (flat
Consequently SV128, should be capable of BOTH globally, directly referencing memory, independent of
the underlying system architecture, as well as incorporating contemporary security models. Additionally,
compatibility with existing RV32 and RV64 executable images need to be supported.

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