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This chapter describes configuration options for Pentium Pro processors and the Pentium Pro
processor bus agents.
A system can contain multiple Pentium Pro processors. Processors can be used in a multipro-
cessor configuration, with one to four Pentium Pro processors on a single Pentium Pro processor
bus. Processors can also be used in FRC configurations, with two physical processors per logical
FRC unit. All Pentium Pro processors are connected to one Pentium Pro processor bus unless
the description specifically states otherwise.
9.1.
DESCRIPTION
Pentium Pro processor bus agents have some configuration options which are determined by
hardware, and some which are determined by software.
Pentium Pro processor bus agents sample their hardware configuration at reset, on the active-to-
inactive transition of RESET#. The configuration signals (except IGNNE#, A20M# and
LINT[1:0]) must be asserted 4 clocks before the active-to-inactive transition of RESET# and be
deasserted two clocks after the active-to-inactive transition of RESET# (see Figure 9-1). The
IGNNE#, A20M#, and LINT[1:0] signals must meet a setup time of 1ms to the active-to-inactive
transition of RESET#.
The sampled information configures the Pentium Pro processor and other bus agents for subse-
quent operation. These configuration options cannot be changed except by another reset. All re-
sets reconfigure the Pentium Pro processor bus agents; the bus agents not distinguish between a
"warm" reset and a "power-on" reset.
CLK
RESET#
{CONFIGURATION
PINS}
Figure 9-1. Hardware Configuration Signal Sampling
CONFIGURATION
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CHAPTER 9
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9-1
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