The values VInSYNCDECODE.14SCN[9:0] and VInSYNCDECODE.34SCN[9:0]are described in pixel clocks. By use of these signals a internal "middle ofscanline" signal is generated and HSYNC, VSYNC and the field information arederived.Caution Even if separate horizontal and vertical synchronization signals are suppliedexternally (VInCONTROL.SYNCSEL[1:0] = 10B), the synchronization separatortiming in VInSYNCDECODE has to be set correctly.VInSYNC polarity The polarity of the external synchronization signal is selectable byVInCONTROL.SYNCINV:• VInCONTROL.SYNCINV = 0: VInSYNC1/VInSYNC2 is not inverted,i.e. high level denotes active synchronization• VInCONTROL.SYNCINV = 1: VInSYNC1/VInSYNC2 is inverted, i.e.low level denotes active synchronizationSynchronizationinformationThe detection of synchronization information can be monitored inVInSTATUS.HSYNC, VInSTATUS.VSYNC and VInSTATUS.FIELD.6.2.3 Synchronization status informationThe status of the internal synchronization signals, derived from the external VideoInput, are monitored by some status bits in the Video Input status register:• VInSTATUS.FIELD indicates the current field information• VInSTATUS.VSYNC indicates the current status of the internalVSYNC signal• VInSTATUS.HSYNC indicates the current status of the internalHSYNC signal6.3 Video Capturing6.3.1 Video capturing modesThe Video Input module can capture interlaced as well as progressive scannedvideo data frames.It distinguishes automatically between both modes by evaluating the fieldinformation, acquired from the timing reference bytes in case of ITU-R656 datainput respectively from the composite or separate synchronization signalVInSYNC1/VInSYNC2.Depending on the recognized mode the video data is stored in two framebuffersin case of an interlaced video respectively in a single one in case of a progressivescanned video.Progressive video In case a progressive scanned video is detected, all video data is stored in theframebuffer, starting at address VInSTARTADDR2.The scanline monitor register VInACTSCANLINE indicates always second field byVInACTSCANLINE.AFLD = 1 and the scanline counterVInACTSCANLINE.ACTSL[11:0] counts linearly from 0 to maximum line number.Chapter 6 Video Input (Ravin-M only)156 Preliminary User's Manual S19203EE1V3UM00
