Xerox DocuColor 12/DCCS50, Service Manual

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10-191 DocuColor 12/DCCS50
Image Processing, Print Interface
Principles of Operation
Reissue
Image Processing
Refer to Chapter 6 - Imaging, in the Principles of Operation for the DocuColor 12 and BSD 16.1
for more information on how the following PWBAs perform signal flow and Image Processing:
• Half Tone PWBA
• Post IPS PWBA
• VSEL Base PWBA
• VSEL Extension PWBA
Print Interface
Figure 1 IDFE Print Interface Block Diagram
The print interface between the DC CS50 and the IDFE is shown in Figure 1 . The signals are
as follows:
• VIDEO DATA ODD and VIDEO DATA EVEN - Each is a set of eight parallel lines which
provide the print data to the IOT.
• TAG ODD and TAG EVEN - Each is a set of four parallel lines which provides auxiliary
data for images sent using YMCK color space.
• nPAGE REQ - The IDFE must provide an entire print page of data to the IOT during the
active (negative) period of this signal.
• nLINE REQ - The IDFE must provide a pair of data lines during the active (negative)
period of this signal.
• VCLK - The IOT uses this signal to sample the video data and tag information.
• nVALID - This indicates that the data on the video data and tag lines is valid and may be
sampled.
The odd and even data and tag buses are used simultaneously to pass 600 dpi images. Either
the even or odd busses can be used individually to pass a 400 dpi image.