Patent ID: 8489791

Claim:
In a bridge coupled to a first bus and a second bus, the bridge having an access table having at least one entry comprising an address and an identification value, a method for communicating between the first and second buses comprising: A) receiving, from the first bus, a command having an identification field and an address field; B) comparing the address field of the command against the address in the access table entry to generate an address match if the address field and the address match; C) comparing the identification field against the identification value in the access table entry to generate an identification match if the identification field and the identification value match; D) transmitting the received command over the second bus if there is an address match and there is an identification match, wherein the each entry in the access table further comprises first and second flags, and wherein in step D), the command is not transmitted unless the first flag is set and the second flag is not set; and E) transmitting an error response over the first bus if there is an address match and no identification match.