Abstract: An integrated circuit has a first and second voltage supply rails with first and second voltage levels and a gated voltage supply rail. Each of the circuit elements is connected either between the first and second voltage supply rails or between the gated rail and the second voltage rail. A source circuit structure comprising one or more circuit elements provides an input signal maintained at a static value during a power gated mode of operation. At least one recipient circuit structure requires receipt of the input signal at the static value during the power gated mode of operation. A distribution network comprises a first subset of circuit elements which pull their output to the first voltage level then the input signal has the static value, and a second subset of circuit elements which pull their output to the second voltage level when the input signal has the static value.

Abstract: The present invention provides a technique for swapping data values within a data word. In particular, a single endian reverse instruction is provided to cause independent swap operations to be performed on particular sections of an input data word. The data processing apparatus of the present invention comprises a data processing unit for executing instructions which is responsive to the endian reverse instruction to apply an endian reverse operation to an input data word Rm comprising a plurality of data values.

Abstract: The present invention provides a technique for swapping data values within a data word. In particular, a single endian reverse instruction is provided to cause independent swap operations to be performed on particular sections of an input data word. The data processing apparatus of the present invention comprises a data processing unit for executing instructions which is responsive to the endian reverse instruction to apply an endian reverse operation to an input data word Rm comprising a plurality of data values.

Abstract: An integrated circuit comprises a plurality of data handling devices interconnected to exchange data by an interconnection bus during a first mode of operation; and diagnostic control means, responsive to a diagnostic device external to the integrated circuit, for controlling one or more of the data handling devices to exchange diagnostic data with the diagnostic device via the interconnection bus during a second, diagnostic, mode of operation.