DISPLAY SYSTEM

摘要

Display data is stored in a display memory in densely packed format in all display modes thanks to memory controller logic which modifies original addresses for mapping display data into the display memory such that a stream of data for driving a display device can be generated from sequential memory locations. This enables the display memory to take advantage of the benefits of dual-ported memory technology whilst maintaining compatibility with VGA display modes. In order to provide complete VGA compatibility, even in unusual applications, a duplicate auxiliary display memory for the storage of the display data in accordance with the original addresses can be provided. This auxiliary display memory is not used for updating the display, but solely for the retrieval of the display data.