9.1.18. Symmetric Agent Arbitration Id; Table 9-2. Breq[3:0]# Interconnect - Intel Pentium Pro Family Developer's Manual

CONFIGURATION

9.1.18. Symmetric Agent Arbitration ID

The Pentium Pro processor bus supports symmetric distributed arbitration among one to four
agents. Each Pentium Pro processor identifies its initial position in the arbitration priority queue
based on an agent ID supplied at configuration. The agent ID can be 0, 1, 2, or 3. Each logical
Pentium Pro processor (not a FRC master/checker pair) on a particular Pentium Pro processor
bus must have a distinct agent ID.
BREQ[3:0]# bus signals are connected to the four symmetric agents in a rotating manner as
shown in Table 9-2 and Figure 9-2. Every symmetric agent has one I/O pin (BR0#) and three
input only pins (BR1#, BR2# and BR3#).
Agent ID 0
Bus Signal Physical Pin
BREQ0#
BREQ1#
BREQ2#
BREQ3#
9-6

Table 9-2. BREQ[3:0]# Interconnect

Agent ID 1
Physical Pin
BR0# BR3#
BR1# BR0#
BR2# BR1#
BR3# BR2#
Agent ID 2 Agent ID 3
Physical Pin Physical Pin
BR2# BR1#
BR3# BR2#
BR0# BR3#
BR1# BR0#