Xerox DocuColor 12/DCCS50, Service Manual

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10-192 DocuColor 12/DCCS50
Scan Interface
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Principles of Operation
Scan Interface
Figure 1 IDFE Scan Interface Block Diagram
The scan interface is very similar to the print interface, except that image data flows in the
opposite direction. The interface is shown in
Figure 1 . The signals are:
• SVDATA ODD and SVDATA EVEN - Each is a set of eight parallel lines which provide the
scan data from the IOT.
• STAG ODD and STAG EVEN - Each is a set of four parallel lines which provides auxiliary
data for images sent using YMCK color space.
• nSEPAGE REQ - The IOT must provide an entire print page of data to the IOT during the
active (negative) period of this signal.
• nSLINE REQ - The IOT must provide a pair of data lines during the active (negative)
period of this signal.
• SVCLK - The controller uses this signal to sample the video data and tag information.
• nSVALID - This indicates that the data on the video data and tag lines is valid and may be
sampled.
As with the print interface, the odd and even data and tag buses are used simultaneously to
pass 600 dpi images. In addition, either the even or odd buses can be used individually to pass
a 400 dpi image.
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