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

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The Contents of Request Packet A

Description

Table 49-4 on page 1213 defines the information driven onto the Request Phase signal group in Packet A. It consists of the address and transaction type. This is sufficient information for:

  • Response Agents to begin the decode to determine which of them is the target device.

  • Snoop Agents to begin the snoop in their internal caches (if it is a memory access).

Table 49-4. Request Packet A Content
Signal(s)Description
ADS#Address Strobe is asserted by the agent issuing the request (the Request Agent), indicating that the agent is providing all of the request information in two packets. This information represents the address, the request type, and additional information about the transaction.
A[35:3]#The qword-aligned ...

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