Apparatus and method for positively and subtractively decoding a

Details Apparatus and method for positively and subtractively decoding a Apparatus and method for positively and subtractively decoding a

1996-07-19

1999-01-26

An, Meng-Ai T.

395308, 395307, 395306, 395856, 395292, G06F 1200

Patent

active

058646884

ABSTRACT:
A computer system having an expansion base for docking a portable portion of the computer system includes a bridge circuit for adaptively decoding addresses on a bus based on the docking status. Both the expansion base and the portable portion include the bridge circuit for passing cycles from a peripheral component interconnect (PCI) bus to an industry standard architecture (ISA) bus. The bridge includes internal devices and configuration registers for controlling the decoding. Bus cycles intended for internal devices and external devices connected to each respective ISA bus of the bridge circuits are positively decoded. Cycles not positively decoded and claimed are subtractively decoded by one of the bridge circuits depending on the docking status.

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