Patent ID: 7069364

Claim:
An automatic assignment logical circuit apparatus for selecting a master device and a slave device from among a first bay device and a second bay device, wherein said first bay device being connected to a first bay connector and said second bay device being connected to a second bay connector, said automatic assignment logical circuit apparatus comprising: first and second connection points for electrically connecting to said first bay connector and said second bay connector respectively, wherein said first and second connection points for assigning said first bay connector and said second bay connector as one of the master device connector and the slave device connector respectively and the slave device connector and the master device connector respectively; third and fourth connection points for electrically connecting to said first bay connector, said third and fourth connection points for receiving first and second Boolean algebra values from said first bay connector respectively, and said automatic assignment logical circuit depends on said first and second Boolean algebra values to send two different Boolean algebra values to said first and second connection points respectively to assign one of said first and second bay connectors as the master device connector and the other as the slave device connector, wherein said first and second Boolean algebra values are different when an integrated drive electronics (IDE) device is inserted into said first bay connector, and said first and second Boolean algebra values are same when a non-IDE device is inserted into said first bay connector; and fifth connection point for electrically connecting to said first bay connector and a reference voltage applied to said fifth connection point, wherein said fifth connection point for starting said logical circuit apparatus when a first bay device is plugged into said first bay connector and stopping said logical circuit apparatus when said first bay device is pulled out said first bay connector.