July 2004
Intermediate to advanced
1744 pages
35h 3m
English
Content preview from The Unabridged Pentium 4 IA32 Processor Genealogy
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Cautionary Note
Unless noted otherwise, the representation of all signal states in tables is in logical, not electrical format. As an example, the first row in Table 49-5 on page 1216 shows a 00000b on REQ[4:0]#, indicating a Deferred Reply transaction type. This means that REQ[4:0]# are deasserted (electrical ones) when driven onto REQ[4:0]#.
| Packet A (Request) | Packet B (Extended Request) | Request Type | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| REQ4# | REQ3# | REQ2# | REQ1# | REQ0# | REQ4# | REQ3# | REQ2# | REQ1# | REQ0# | |
| 0 | 0 | 0 | 0 | 0 | x | x | x | x | x | Deferred Reply. Initiated by Response Agent to complete a request received earlier. For more information, see “Pentium® 4 FSB Transaction Deferral” on page 1277. |
| 0 | 0 | 0 | 0 | 1 | Reserved (ignore). | |||||
| 0 | 1 | 0 | 0 | 0 | DSZ field. Always 00b (= ... | |||||
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