Abstract: A fixing device that fixes, to a light emitting device that emits light, a lens barrel included in a projection optical device and holding a plurality of lenses includes a first tube member, a contact section provided on an outer side of the first tube member and in contact with a holding section included in the light emitting device, and a pressing mechanism provided to be opposed to the contact section and configured to press the holding section toward the contact section when the fixing device is attached to the light emitting device.

Abstract: A display controller includes a memory storing at least three frames of image data, a write starting address register to which a write starting address is set, a read starting address register to which a read starting address is set, and a rotation control section performing control for reading out from the memory image data corresponding to an image whose orientation is rotated. When writing of the image data to the area designated by the write starting address is completed, the write starting address is updated and the previous value of the updated write starting address is set to the read starting address register. The image data corresponding to the rotated image is read out by the rotation control section 40 from an area of the memory designated by the read starting address, and then supplied to a display driver.

Abstract: A display controller includes a memory storing at least three frames of image data, a write starting address register to which a write starting address is set, a read starting address register to which a read starting address is set, and a rotation control section performing control for reading out from the memory image data corresponding to an image whose orientation is rotated. When writing of the image data to the area designated by the write starting address is completed, the write starting address is updated and the previous value of the updated write starting address is set to the read starting address register. The image data corresponding to the rotated image is read out by the rotation control section 40 from an area of the memory designated by the read starting address, and then supplied to a display driver.

Abstract: A first-in first-out (FIFO) storage device for storing data including continuous identical values, which is reduced in a required circuit scale and increased in a reading operation speed, and which comprises a memory region (13) provided with a counter unit and a data unit corresponding to a plurality of addresses, a comparison unit (11) for checking whether or not a new input data is identical with an input data one data ahead of the new one, and a write control unit (12) for controlling, based on the checked result by the comparison unit (11), to write the current input data into a new address in the data unit of the memory region (13) when the new input data is not identical with the one-data-ahead input data and for controlling to count up a count value in a one-address-ahead address in the counter unit of the memory region (13) when the two data are identical with other.

Abstract: A physical layer device 21 includes a link layer interface 2, a physical layer logic circuit 3, and ports 4 to 6. In addition to these components, the physical layer device 21 includes therein a test link layer circuit 22, a test physical layer logic circuit 23, and switches 24 to 26 in order to test the operation of the physical layer logic circuit 3 and the ports 4 to 6. In testing, the ports 4 to 6 are externally connected by a cable 27, and contacts of the switches 24 to 26 are switched. Accordingly, the physical layer logic circuit 3 is connected to the test link layer circuit 22, and the ports 5 and 6 are connected to the test physical layer logic circuit 23. According to the present invention, testing can be performed by a physical layer device alone, thus reducing the test time and the test cost.