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cache index

The middle bits of an address, which pick where in the cache to look.

The index field, of log2(number of sets) bits just above the line offset, selects one set (in a direct-mapped cache, one line); consecutive lines therefore map to consecutive sets.

Examples

  • A 32 KiB direct-mapped cache with 64-byte lines has 512 lines, so 9 bits above the 6 offset bits pick the line.

See also

line offset direct-mapped cache
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