This paper is provided to highlight the issues that need to be considered, and to discuss different ways to use the SDRAM interface. The SDRAM is divided up at the lowest level in to rows and columns. To access an element in an SDRAM module, first the row is opened and is then said to be the active row, secondly a column with in that row is selected and the data output from its location. This setting up of the SDRAM can take several clock cycles and every access will require the appropriate row to be activated.
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