Samsung SCX-1100 Service Manual page 83

CIRCUIT DESCRIPTION
2. DMA mode
DMA mode is the method of Reading or Writing Data in
Block unit by activating two DMA Channels of OA-980
respectively. When A8 or A9 is "Low" and when /IP_CS is
"Low," GDMA of Jupiter3 Reads or Writes in Memory to
Memory mode, as the appropriate DMA Channel is activat-
ed. See Figure (17). Of course, it performs required DMA
register setting in Multiplexed 8bit Bus(data & address)
mode before DMA is accomplished.
Repair Manual
3-24
3-5-2-4 Scanner Interface Section(PI)
It directly controls 16bit ADC and 600dpi color CCD con-
nected to CCD, processes Shading and Gamma correc-
tion, the basic course required for Image process of RGB
12bit(8+4bit) data transferred from ADC, then performs the
function of storing the data in SDRAM of OA-980 through
MI Block.
<Figure 17. Hi Block Timing diagram(2)>
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