According to one embodiment, a semiconductor device includes a memory-transfer control unit that controls data transfer between a memory and a sound unit. A plurality of sound data transfer routes are configured by one memory-transfer control unit and one sound unit. The semiconductor device outputs reproduction sound data via at least one sound data transfer route and acquires at least two pieces of recording sound data on account of one piece of reproduction sound data via at least two sound data transfer routes.

A method of ensuring operation of a calculator includes causing, by a CPU, the calculator to perform a predetermined operation verification calculation of which a correct value that is a resultant value in normal operation is set to ae predetermined value; acquiring, by the CPU, the resultant value of the calculation; referencing, by the CPU using a relative address referencing capability of the CPU, an address that is stored in an address acquired by adding the acquired resultant value to the starting address of the memory; and executing, by the CPU, a function stored at the referenced address.

A testing system and method for an arithmetic logic unit are provided. The system includes: a control unit, a data providing unit, a first input unit, a second input unit, an arithmetic logic unit, an expected result unit, a comparator and a test result storage unit. The control unit controls the testing process. The data providing unit provides data for the first input unit, the second input unit and the expected result unit. The first input unit and the second input unit provide test data for the arithmetic logic unit. The arithmetic logic unit performs an operation and provides an operation result for the comparator. The expected result unit generates an expected result and provides the expected result of this round of testing for the comparator. The comparator compares the operation result with the expected result, and provides a comparison result for the test result storage unit.