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primary cache

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primary cache [¦prī‚mer·ē ′kash]
(computer science)
A cache memory located within a microprocessor chip itself. Also known as internal cache; level 1 cache.
(hardware, architecture)primary cache - (L1 cache, level one cache) A small, fast cache memory inside or close to the CPU chip.

For example, an Intel 80486 has an eight-kilobyte on-chip cache, and most Pentiums have a 16-KB on-chip level one cache that consists of an 8-KB instruction cache and an 8-KB data cache.

The larger, slower secondary cache is normally connected to the CPU via its external bus.


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The system leaves a copy of frequently accessed data in primary cache for very fast retrieval.
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Primary controller transfers the data into the primary cache
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The system leaves a copy of frequently accessed data in primary cache for very fast retrieval.
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