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The Unabridged Pentium 4 IA32 Processor Genealogy by Bob Colwell, Tom Shanley

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Transaction Pipelining

The FSB Is Subdivided into Signal Groups

Refer to Figure 44-2 on page 1143. The FSB is subdivided into signal groups. Each signal group is only used during a particular phase of the transaction. The subsections that follow provide a brief introduction to the transaction phases.

Figure 44-2. FSB Signal Groups (except for the Arbitration group)

Step 1: Gain Ownership of the Request Phase Signal Group

When a Request Agent wishes to acquire FSB ownership in order to issue a transaction request, it arbitrates for ownership of the portion of the FSB referred to as the Request Phase signal group.

Step 2: Issue the Transaction Request ...

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