Abstract: A data processing assembly includes one or more hosts connected to one or more I/O Expansion Drawers. Assignment state information is stored on the Expansion Drawer to convey the assignment state of Expansion Drawer(s) resources to the hosts. The host retrieves the assignment state and, from it, determines, for each Expansion Buss cable connected to the host, the number of Expansion Cards in the Expansion Drawer to configure. A change in the number of Expansion Cards in the expansion apparatus may necessitate a change in the assignment state, which can be electronically accommodated (as opposed to a manual reconfiguration). Similarly, a failure of an Expansion Buss cable is addressed by electronically reassigning resources to another host or to the same host over a different Expansion Buss cable without the need for further manual intervention. The assembly is capable of verifying correct cable connection between a host and the Expansion Drawer.

Abstract: Embodiments of the invention address deficiencies of the art in respect to power sequencing, and provide a method, system and computer program product for supporting coupling with independent logic circuits. In one embodiment of the invention, a computer system supporting coupling with independent logic circuits may include an independent logic circuit including at least one voltage regulator that regulates voltage to core logic such that voltage is transferred to the core logic upon receiving a first level of voltage. The independent logic circuit may further include an I/O driver that becomes operational upon receiving a highest level of voltage higher than the first level of voltage. The computer system may further include a voltage ramp for transferring voltage to the independent logic circuit at the first level voltage for a predetermined period of time and subsequently at the highest level of voltage.

Abstract: A data processing assembly includes one or more hosts connected to one or more I/O Expansion Drawers. Assignment state information is stored on the Expansion Drawer to convey the assignment state of Expansion Drawer(s) resources to the hosts. The host retrieves the assignment state and, from it, determines, for each Expansion Buss cable connected to the host, the number of Expansion Cards in the Expansion Drawer to configure. A change in the number of Expansion Cards in the expansion apparatus may necessitate a change in the assignment state, which can be electronically accommodated (as opposed to a manual reconfiguration). Similarly, a failure of an Expansion Buss cable is addressed by electronically reassigning resources to another host or to the same host over a different Expansion Buss cable without the need for further manual intervention. The assembly is capable of verifying correct cable connection between a host and the Expansion Drawer.