3. OPERATION AND TIMINGCOPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)3-682. Synchronization Control for the Main/Sub Scanning DirectionThe video signals are synchronized for the main scanning direction based on the BD signal by the videocontroller. The video signal after gamma correction is written to the memory for main scanning directionsynchronization in response to the main scanning sync signal (HSYNC*) based on the write BD signal(WBD). At this time, writing is enabled by the write enable signal (WE*), and the same timing is used for Y, M,C, and Bk.Reading from the memory for the main scanning direction is executed based on the BD signal for Y, M,C, and Bk. In the sample shown in Figure 3-410, the Y main scanning sync signal (YSYNC*) is generated insync with the Y BD signal (YBD); the read enable signal (YRE*) is generated after a specific period of time*following the generation of YSYNC; and the Y video signals are read from the memory for the main scanningdirection.*May be changed; used for image position correction explained later.Figure3-409Figure 3-410Y,M Y,MC,BkC,BkMemory formain scanningdirection syncMemory for mainscanning directionBD signalY,M,C,BkBDdetectionPCBVideo signalVideo signalVideo control PCBWEWECRE, BkREYRE, MREClockgenerationforsynccontrolLaser driver PCBWrite BD signal (WBD)Y BD signal (YBD)Main scanning sync signal(HSYNC*)Y main scanning sync signal(YSYNC*)Write enable signal (WE*)Y read enable signal (YRE*)Y video signal (YVD)Y video signal (YVD)Effective pixels in CCD
