July 2004
Intermediate to advanced
1744 pages
35h 3m
English
Content preview from The Unabridged Pentium 4 IA32 Processor GenealogyBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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On-Chip Cache Added
General
Refer to Figure 18-7 on page 428. The 486 was the first IA32 processor to integrate a cache on the processor die. The cache had the following characteristics:
It was a write-through cache (except for one version that had a write back cache).
- The write-through cache supported two possible states for a line: S (Shared) or I (Invalid), wherein S merely indicated that the line was valid.
- The write back cache supported four possible states for a line: M (Modified), E (Exclusive), S (Shared), or I (Invalid).
It was a unified code/data cache. A collision on the cache due to the receipt of simultaneous access requests from the Execution Unit data and the Instruction Prefetcher results in stalling the Prefetch Unit.
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