primary cache definition hardware, architecture
(L1 cache, level one cache) A small, fast cache
memory inside or close to the CPU
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