Apparatus which prepares a master map portraying location of dev

Details Apparatus which prepares a master map portraying location of dev Apparatus which prepares a master map portraying location of dev

1997-04-29

1998-08-18

Lee, Thomas C.

395866, 395856, 395824, 395829, G06F 1300

Patent

active

057970360

ABSTRACT:
An I/O control system for a general-purpose computer having multiple bus branches separated by routing circuitry prepares a digital map of I/O device locations on the bus branches, and copies versions of the maps to registers in the routing circuitry on startup and reset. The routing maps provide immediate routing information for I/O requests issued by one or more CPUs in a system, allowing the routing circuitry between bus branches to immediately route requests to the proper device with a minimum of wait states. In one aspect I/O devices are polled for location at startup and reset, and in another aspect, a universal map protocol is a part of the BIOS or storage accessible by the BIOS, making a system self-configuring and providing the necessary information for the mapping for the routing circuitry.

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