Micros Systems Workstation 5, Руководство по обслуживанию

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2-20 Workstation 5 Field Service Guide
Workstation 5 System Board Technical Descriptions
LPC Interface
LPC Interface
The Low Pin Count Interface is a PCI like-bus comprised of seven signals lines
and is used to replace the legacy ISA bus as the interface between the
Companion Device and Super IO and BIOS devices. Figure 2-9 below displays
a block diagram of the LPC Bus as implemented on the Workstation 5 System
Board.
Figure 2-9: LPC Bus Block Diagram
A total of three devices and the LPC Debug slot are attached to the LPC Bus.
Because the LPC Bus is a replacement for the legacy for the ISA Bus, the
BIOS redirects Port 80H POST Codes to the LPC Bus.
Two lines from the Companion Device, BOS0 and BOS1 specify location of
the Boot Device after a hardware reset. These pins are configured to ‘Boot
from a Memory Device on the LPC Bus,’ in this case BIOS EEPROM U36.