The Unabridged Pentium 4 IA32 Processor Genealogy

The Response Types

Table 51-1 on page 1244 lists the possible responses that can be presented on RS[2:0]#.

Table 51-1. Response List (0 = deasserted, 1 asserted)

RS[2:0]#

Description

000b

Idle Response. RS[2:0]# are deasserted. This is the state of RS[2:0]# before and after the response has been delivered to the Request Agent. In other words, immediately upon entry into the Response Phase, RS[2:0]# are in this state and will remain in this state until a valid response is presented. When any of the valid (i.e., non-idle) responses are driven (for one clock), one or more of the RS[2:0]# signals are driven low. All of the valid response patterns have at least one of the RS signals asserted (remember, in this table, a 0 = deasserted = electrically high). ...