Patent ID: 7355917

Claim:
A two-dimensional data memory comprising memory elements for storing digital data which are arranged in rows and columns, which are designed to store in each case one data word, which in the row direction and in the column direction are coupled locally to their respectively adjacent memory elements such that with each control pulse of a row control signal the data words of the memory elements of all rows are shifted in a shift direction into the memory elements of the respectively adjacent row, with the data words of the last row being shifted into the first row, and such that with each control pulse of a column control signal the data words of the memory elements of all columns are shifted in a shift direction into the memory elements of the respectively adjacent column, with the data words of the last column being shifted into the first column, and which are designed such that an external write access is possible only in respect of at least one predefined row and at least one predefined column and such that an external read access is possible only in respect of at least one predefined row and at least one predefined column, wherein in order to compensate for the processing time of a signal processing unit provided outside the memory, which processing unit processes data read from a row n or column m of the data memory and takes a time corresponding to k control pulses of the row control signal or of the column control signal, a row or column for writing the data processed by the processing unit is provided in the data memory, said row or column being arranged k rows or columns in front of the row n or column m counter to the shift direction.