Abstract: A display control device for outputting display data to frame buffers includes an input for receiving portions of the display data, different portions being in raw form and in compressed form. A data controller determines, for each received portion, whether it is in compressed form or raw form and controls the received portion to move along a first, bypass, path if it is determined that the received portion of display data is in raw form and to control the received portion of display data to move along a second path to a decompression engine if it is determined that the received portion of display data is in compressed form. The decompression engine decompresses the particular portion of compressed display data and forwards a corresponding portion of decompressed display data along a third path, the portions of data from the first and third paths then being output to the frame buffers.

Abstract: A display control device for outputting display data to frame buffers includes an input for receiving portions of the display data, different portions being in raw form and in compressed form. A data controller determines, for each received portion, whether it is in compressed form or raw form and controls the received portion to move along a first, bypass, path if it is determined that the received portion of display data is in raw form and to control the received portion of display data to move along a second path to a decompression engine if it is determined that the received portion of display data is in compressed form. The decompression engine decompresses the particular portion of compressed display data and forwards a corresponding portion of decompressed display data along a third path, the portions of data from the first and third paths then being output to the frame buffers.

Abstract: A mask generator for use with at least first and second addressing schemes in a microprocessor system, wherein a first addressing scheme is in little endian format and a second addressing scheme is in big endian format. The mask generator, based upon data input as to the number of bytes to be written and the byte address of the first byte, will generate a mask containing as many contiguous 1's as there are bytes to be written. The byte address is then used to rotate the generated mask to align it accordingly with respect to the position of the bytes within the portion of the word that is to be written. The mask generator employs a simple 1's complement together with a specially generated term K for the most significant bit of the mask output, and the rotator is constructed with 0, 2 and 4 bit rotates in a first stage, and 0, 1, 4 and 5 bit rotates in a second stage.