Abstract: To determine performance degradation at functional module in a normal power state due to a power control device, voltages are applied to oscillators at a power diagnostic module. A first voltage is a supply voltage for the data processing device, and a second voltage is a supply voltage applied at a functional module of the data processing device. Counters are adjusted based on the oscillators to determine the oscillators' respective frequencies. In addition, the power diagnostic module can include a timer to measure the length of time that the functional module is in a low-power state, and an analog to digital converter to measure the voltage applied to the functional module during transitions to and from the low-power state.

Abstract: To determine performance degradation at functional module in a normal power state due to a power control device, voltages are applied to oscillators at a power diagnostic module. A first voltage is a supply voltage for the data processing device, and a second voltage is a supply voltage applied at a functional module of the data processing device. Counters are adjusted based on the oscillators to determine the oscillators' respective frequencies. In addition, the power diagnostic module can include a timer to measure the length of time that the functional module is in a low-power state, and an analog to digital converter to measure the voltage applied to the functional module during transitions to and from the low-power state.

Abstract: A system and method increases the number of split transactions that can be outstanding on an input/output (I/O) bus operating in accordance with a bus protocol, such as the Peripheral Component Interface Extended (PCI-X) specification standard. An I/O bridge that interfaces between one or more processors and one or more I/O devices coupled to the I/O bus includes a transaction initiation engine, a transaction completion engine and one or more queues for buffering information that is to be transferred onto or which has been received from the I/O bus. The I/O bridge is configured to concatenate, at least logically, a tag field and a function number field from an attribute message so as create a novel, super-tag field that the I/O bridge then associates with each bus transaction. By creating the super-tag field, the I/O bridge substantially increases the number of uniquely identified bus transactions which may be responded to with a Split Response.

Abstract: A system and method increases the number of split transactions that can be outstanding on an input/output (I/O) bus operating in accordance with a bus protocol, such as the Peripheral Component Interface Extended (PCI-X) specification standard. An I/O bridge that interfaces between one or more processors and one or more I/O devices coupled to the I/O bus includes a transaction initiation engine, a transaction completion engine and one or more queues for buffering information that is to be transferred onto or which has been received from the I/O bus. The I/O bridge is configured to concatenate, at least logically, a tag field and a function number field from an attribute message so as create a novel, super-tag field that the I/O bridge then associates with each bus transaction. By creating the super-tag field, the I/O bridge substantially increases the number of uniquely identified bus transactions which may be responded to with a Split Response.