Patent ID: 6674442
Filing Date: 2004-01-06
Classification: G11C,H04N

Abstract:
An image memory system in which image data related to the respective pixels of an image composed of pixels arranged at positions specified by combination of a row specifying bit string of Ny bits in length and a column specifying bit string of Nx bits in length is stored in specific two memories, wherein;said two respective memories have 2b (where b is a positive integer) banks capable of being operated independently of each other, make it possible to consecutively access synchronously with a clock a specified number of pieces of data at consecutive addresses in the same row space on the basis of addresses specified by a row address bit string of Nr bits in length and a column address bit string of Nc (Nc=Nx+Nyâˆ’Nrâˆ’bâˆ’1) bits in length in a bank specified by a bank changeover bit (or a bank changeover bit string), and have a route selecting bit for specifying a memory to he accessed out of said two memories, and said image memory system comprises; a means for forming said column address bit string out of the lower L bits of said column specifying bit string and the lower (Ncâˆ’L) bits of said row specifying bit string, a means for forming said row address bit string out of the upper (Nxâˆ’Lâˆ’Bx) bits of said column specifying bit string and the upper (Nyâˆ’Nc+Lâˆ’By) bits of said row specifying bit string when Bx (>=1) and By (>=1) are arbitrary positive integers satisfying â€œBx+By=b+1â€ , and a means for forming a route selecting bit and a bank changeover bit string by using a bit string of Bx bits from the (L+1)th bit to the (L+Bx)th bit of said column specifying bit string and a bit string of By bits from the (Ncâˆ’L+1)th bit to the (Ncâˆ’L+By)th bit of said row specifying bit string, wherein; said route selecting bit is formed out of the exclusive OR of the (L+1)th bit of said column specifying bit string and the (Ncâˆ’L+1)th bit of said row specifying bit string, and said bank changeover bit string is formed out of a bit string obtained by removing either one bit of the (L+1)th bit of said column specifying bit string or the (Ncâˆ’L+1)th bit of said row specifying bit string, which are used for forming said route selecting bit, from a bit string obtained by combining both of said bit strings and together.