MFC2000

The bi-level resolution conversion logic in the MFC2000 performs expansion (converting from lower to higher solution) and reduction (converting from higher to lower resolution) of horizontal image data. Vertical line ORing can also be performed for image reduction in the vertical direction. There are two data sources that can be selected for this bi-level resolution conversion block. One is T4/T6 Decompressor and another is the external memory. The data from the T4/T6 Decompressor is serially input to this bi-level resolution conversion logic. The data from the external memory is input to this bi-level resolution conversion logic through the DMA operation. The MA operation for the data from the external memory uses the DMA channel 9. If the T4/T6 Decompressor is selected as the data source, the DMA channel 9 request is blocked. The data from this resolution conversion logic is output to the external memory also through the DMA operation. The DMA operation for the output data uses the DMA channel 8 (See Figure 9-1).