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Default Configurations; Discrete Apic Configurations - Intel MultiProcessor Specification

Intel multiprocessor specification
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MultiProcessor Specification
Table 5-1. Default Configurations
Default
Number
Config Code
of CPUs
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8-255
Reserved for MP future use.
The default system configurations are designed to support dual-processor systems with fixed
configurations. Systems with dynamically configurable components, for example, a uniprocessor
system with an upgrade socket for the second processor, must always generate the MP
configuration table. Failure to do so may cause the operating system to install the wrong modules
due to erroneous configuration information.

5.1 Discrete APIC Configurations

Figure 5-1 shows the default configuration for systems that use the discrete 82489 APIC. The
Intel486 processor is shown as an example; however, this configuration can also employ Pentium
processors. In Pentium processor systems, PRST is connected to INIT instead of to RESET.
5-2
Bus
APIC
Type
Type
Variant
ISA
82489DX
EISA
82489DX
Neither timer
IRQ0
chaining
EISA
82489DX
MCA
82489DX
ISA + PCI
Integrated
EISA + PCI
Integrated
MCA + PCI
Integrated
Schematic
As in Figure 5-1, but without
EISA logic.
As in Figure 5-1, but without
nor DMA
IRQ0 and IRQ13 connection to
the I/O APIC.
As in Figure 5-1.
As in Figure 5-1, but without
EISA bus logic, with inverters
before I/O APIC inputs 1-15.
As in Figure 5-2, but without
EISA logic.
As in Figure 5-2.
As in Figure 5-2, but without
EISA bus logic, with inverters
before I/O APIC inputs 1-15.
Version 1.4

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