MEMORY ACCESS CONTROLLER AND ITS METHOD

    公开(公告)号:JP2000322312A

    公开(公告)日:2000-11-24

    申请号:JP12186899

    申请日:1999-04-28

    Applicant: IBM

    Abstract: PROBLEM TO BE SOLVED: To sharply reduce the frequency of memory access such as picture printing processing. SOLUTION: When a CPU 100 reads picture data from a buffer block in which any data are never written, a memory controller 12 returns preliminarily stored initial data without reading any picture data from a picture buffer 140. At the time of writing the picture data in the buffer block for the first time, the memory controller 12 stores and manages the data, and writes the initial data in the buffer block, and then writes the picture data. When a reading or writing request is issued to a buffer block in which any data are written once, the memory controller 12 operates the reading or writing of data as requested.

Patent Agency Ranking