ARM の略語

SBO: Should Be One
SBZ: Should Be Zero
SBZP: Should Be Zero or Preserved

RAZ なんてのもあるな Reserved as Zero とかかかな？RAZ/WI とか RAO とかもある。あーやっとみつけた。

RW

Read and write
RO

Read-only
WO

Write-only
RAZ

Read-As-Zero
WI

Write-ignored
RAO

Read-As-One
RAZ/WI

Read-As-Zero, Writes Ignored
RAO/SBOP

Read-As-One, Should-Be-One-or-Preserved on writes.
RAO/WI

Read-As-One, Writes Ignored
RAZ/SBZP

Read-As-Zero, Should-Be-Zero-or-Preserved on writes
SBO

Should-Be-One
SBOP

Should-Be-One-or-Preserved
SBZ

Should-Be-Zero
SBZP

Should-Be-Zero-or-Preserved

そんなのわかるかい！！