The Unabridged Pentium 4 IA32 Processor Genealogy

Signals that Can Be Driven by Multiple FSB Agents

The signals shown in Table 43-5 on page 1135 are open-drain signals that may be driven by multiple agents on the FSB simultaneously. It should be noted that there are additional open-drain processor pins (BSEL[1:0], VID[5:0], THERMTRIP#, FERR#/PBE#,IERR#, BPM[5:0]#, BR0#, and TDO), but they are not driven by multiple FSB agents simultaneously.

Table 43-5. Open-Drain Signals

Signal(s)	Description
BINIT#	The Bus Initialization signal.
BNR#	The Block Next Request signal.
HIT# and HITM#	The Snoop Result signals.
MCERR#	The Machine Check Error signal.