Method and apparatus for mapping data of a 2-dimensional space from a linearly addressed memory system
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United States of America Patent
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Mar 4, 1997
Issued Date -
N/A
app pub date -
Aug 26, 1994
filing date -
Mar 15, 1991
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Abstract
A 2-dimensional display space is mapped into the external DRAM addresses by embedding in the address space X and Y vectors of the display space. The mapping of the X and Y vectors allows a macroblock of pixels to be stored in one DRAM memory page, so that an access to a macroblock can be efficiently accomplished under a page mode access to the DRAM page. By providing control to one address bit, data of four pixels can be obtained at one time in one of 2 pixel.times.2 pixel 'quad pixel' configuration, or in a 4 pixel.times.1 pixel horizontal 'scan' configuration. In addition, a structure and a method are provided for accessing a 16.times.16-pixel picture area in two parts, in order that the number of DRAM page boundaries crossed during access of the 16.times.16-pixel picture area is minimized, thereby increasing the efficiency of memory access by reducing the overhead cost of initial accesses under page mode access to DRAMs.
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